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Publication numberUS3929678 A
Publication typeGrant
Publication dateDec 30, 1975
Filing dateAug 1, 1974
Priority dateAug 1, 1974
Also published asDE2437090A1, DE2533758A1, DE2533758C2
Publication numberUS 3929678 A, US 3929678A, US-A-3929678, US3929678 A, US3929678A
InventorsHeuring Vincent Paul, Laughlin Robert Gene
Original AssigneeProcter & Gamble
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Detergent composition having enhanced particulate soil removal performance
US 3929678 A
Abstract
Detergent compositions are disclosed incorporating combinations of specified ethoxylated zwitterionic compounds with other types of surfactants and with detergent builders to give enhanced particulate soil removal.
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Description  (OCR text may contain errors)

United States Patent Laughlin et al.

[ Dec. 30, 1975 DETERGENT COMPOSITION HAVING ENHANCED PARTICULATE SOIL REMOVAL PERFORMANCE Inventors: Robert Gene Laughlin; Vincent Paul Heuring, both of Cincinnati, Ohio The Procter & Gamble Company, Cincinnati, Ohio Filed: Aug. 1, 1974 Appl. No.: 493,953

Assignee:

US. Cl. 252/526; 252/545; 252/546; 260/501.l2 Int. Cl. ..Cl1D 3/066; C1 1D 1/18 Field of Search 252/526, 527, 545, DIG. l1; 260/501.l2

References Cited UNITED STATES PATENTS 8/1972 Walz et al.... 8/26 FOREIGN PATENTS OR APPLICATIONS 813,502 0000 Belgium 260/457 2,009,802 11/1970 Germany 260/501.l2

Primary Examiner-John D. Welsh Attorney, Agent, or FirmRichard C. Witte; Julius P. Filcik; Charles R. Wilson 29 Claims, 1 Drawing Figure SUDS HETGHT (CMS) US. atent Dec. 30, 1975 3,929,678

SUDSING EVALUATION OF COMBINATIONS OF C|6ETHOXYLATED ZWITTERIONIC COMPOUND (CIGEZ) AND AN|oN|c CO-SURFACTANT (C|| 8LAS) TOTAL SURFACTANT CONCENTRATION= ZOOppm TEMPERATURE |OOF.

MINERAL HARDNESS 5,5 grains/gal.

Cc|=Mg=3=l 26- LAS EZ=LAS I9= l 1so 2 4 6 8 IO TIME (MINUTES) DETERGENT COMPOSITION HAVING ENHANCED PARTICULATE SOIL REMOVAL PERFORMANCE BACKGROUND OF THE INVENTION This invention relates to detergent compositions having improved particulate soil removal capability. More particularly, this invention relates to detergent compositions incorporating certain ethoxylated compounds which provide unexpectedly good clay soil removal.

Zwitterionic surfactants, i.e., those surface active compounds that contain both positive and negative charge centers in the same molecule while being electrically neutral, are known. For example, U.S. Pat. Nos. 3,668,240 and 3,764,568 to Melvin A. Barbera, issued respectively on June 6, 1972, and Oct. 9, 1973, disclose zwitterionic surfactants having a 2, 3-butene moiety between the charge centers. U.S. Pat. No. 3,332,875 to Adriaan Kessler and Phillip Floyd Pflaumer also discloses mixtures of certain olefin sulphonates with zwitterionic detergents in which the charge centers are separated by a 2-hydroxy propane group. U.S. Pat. Nos. 3,452,066 and 2,781,390 to I-Ians S. Mannheimer, issued respectively on June 24, 1969, and Feb. 12, 1957, outline a range of zwitterionic surfactants which optionally may be substituted with a wide variety of oxygen-containing groups between the positive and negative charge centers. U.S. Pat. No. 3,769,311 to Leonard J. Armstrong and Eldon de Vere Dawald issued Oct. 30, 1973, discloses carboxylic compounds having ethylene oxide groups between the charge centers but fails to recognize the effect of the various structural parameters on the performance of the molecule in removing soil, especially particulate soil.

In contrast, the present invention concerns detergent compositions incorporating certain zwitterionic surfactants in a polyethenoxy group of a size that permits not only adsorption of the molecule from an aqueous system onto particulate and other soils, and the subsequent removal of the soil by emulsification or dispersion but also the continued maintenance of the removed soil in suspension in the aqueous solution.

Some of these compounds are effective in the absence of conventional detergent additives such as builders, surfactants etc. and form the subject of the commonly assigned co-filed Applications by Robert G. Laughlin, Eugene P. Gosselink, William A. Cilley, and Vincent P. Heuring Ser. No. 493,951, filed Aug. 1, 1974 and Robert G. Laughlin, Eugene P. Gosselink, and William A. Cilley Ser. No. 493,956, filed of even date, both Applications being entitled Detergent Compounds." The disclosures of both said Applications are hereby incorporated herein by reference.

However, the present invention is directed to the discovery that a wider range of zwitterionic compounds, of the type disclosed in the above identified Applications, in combination with certain other surfactant and detergent builder materials can provide unexpectedly good particulate soil removal and also good oily soil removal from hard surfaces and textile materials. The ethoxylated zwitterionic compounds useful in the present invention possess an ability to remove particulate soil that is independent of water hardness over a very wide range or Ca and Mg levels. Furthermore, this performance is relatively insensitive to temperature changes in the range of 70140F, the normal range for domestic cleaning functions.

2 The importance of such a development is readily apparent as it permits a high level of soil removal performance to be obtained with a range of detergent formulations. Furthermore, the nature and level of 5 other components of the formulation can be controlled by the selection of an ethoxylated zwitterionic material having the appropriate level of performance.

Accordingly, it is an object of the present invention to provide detergent compositions incorporating ethoxylated zwitterionic compounds that have good particulate and oily soil removal performance.

Another object of the present invention is the provision of detergent compositions having improved particulate and oily soil removal performance in both liquid and granular forms.

SUMMARY OF THE INVENTION In its broadest aspect the present invention embraces a detergent composition comprising:

A. l to 99% by weight of the composition of a watersoluble compound having a formula selected from the group consisting of:

wherein R is selected from the group consisting of straight and branched chain C C alkyl and alkenyl moieties and alkaryl moieties in which the alkyl group has 10-24 carbon atoms;

R is selected from the group consisting of straight and branched chain C -C alkyl and alkenyl moieties, alkaryl moieties in which the alkyl group has 6-16 carbonatoms, and C alkyl and hydroxyalkyl moieties;

R is selected from the group consisting of straight and branched chain C C alkyl and alkenyl moieties, alkaryl moieties in which the alkyl group has 6-16 carbon atoms, C alkyl and hydroxyalkyl moieties and -(C H O),I-I wherein x has a value of about 3 to about 50;

R is selected from the group consisting of C alkylene, C -C alkenylene, 2-hydroxy C alkylene and 2- and 3- hydroxy C alkylene moieties and C -C alkarylene moieties provided that where R is (C H O),l-I then R, is CH Cl-I X is an anion selected from the group consisting of sulfate and sulfonate radicals;

and y has a value in the range of 2-100 provided that R is selected from the group consisting of linear and branched C -C alkyl and alkenyl radicals;

R is selected from the group consisting of linear and branched C -C alkyl and alkenyl radicals and C -C alkyl and hydroxyalkyl radicals; X is selected from the group consisting of sulfate and sulfonate;

y and x have values in the range of 2-100 provided that y x B 12;

M is a cation selected from the group consisting of alkali metal, ammonium and alkanolammonium B. 99 to 1% by weight of the composition of an organic detergent, preferably selected from the group consisting of anionic, nonionic, ampholytic, and zwitterionic detergents.

In the context of the present invention, ethoxylated zwitterionic compounds having hydroxy substituents on the carbon atoms immediately adjacent the nitrogen atom and/or X moiety are not preferred as they are unstable in water, especially at pI-Is other than neutrality, and are extremely difficult to prepare compared to other hydroxy substituted compounds.

Preferably, the ethoxylated zwitterionic compound is one of either:

(l)-(N-C a1kyl,N-C alkyl,N- polyethenoxy ammonio )-2-polyethenoxyethane- 1 sulphonate wherein the total number of ethylene oxide groups lies in the range -25 w-(N-C alkyl,N,N-diC -C alkylammonio)-2-polyethenoxy ethane-l-sulphonate wherein the number of ethylene oxide groups in the polyethenoxy chain is in the range 6-12.

DESCRIPTION OF THE DRAWING The FIGURE illustrates the sudsing characteristics of a series of blends of an ethoxylated zwitterionic compound (C EZ) and an anionic cosurfactant (C LAS). The FIGURE constitutes a plot of the suds height (in cms.) developed by the Recirculating Suds Generator (R.S.G.) as a function of time (in minutes) for C EZ alone, for blends of C EZ:C LAS of 19:1, 7:1, 3:1 and 1:1 by weight and for C LAS alone.

PERFORMANCE TESTING In this specification the assessment of particulate and a. Particulate soil removal testing This is carried out in either an automatic mini washing machine (AMW) having a capacity of 4,700 ml. and a cloth/liquor ratio of 1:30 or a Tergotometer having a capacity of 1,000 ml. and a cloth/liquor ratio of 1:140. In both instances the machines are fitted with horizonally rotating paddle agitators, the AMW having a speed of 100 RPM, while the Tergotometer uses a speed of 80 RPM.

The AMW washing procedure involves a l2-minute wash cycle at 105F in 7 grains per US. gallon hard water (calculated as CaCO using a 2:1 ratio of CazMg salts. The first two minutes of the cycle are used for product dissolution following which the fabric load is added and washed for the remaining 10 minutes. A 5-minute rinse cycle then follows, 2 minutes of which is with agitation, the remaining 3 minutes being a spin to remove excess moisture. The fabrics are then tumbledried prior to being graded.

A similar washing procedure is used for the Tergotometer with the exception that 5.5 grains/gallon water is employed having a 3:1 ratio of CazMg salts (calculated as CaCO The wash is followed by one rinse cycle of 3 minutes in F water of the same hardness, level, and type as for the wash, after which the swatches are machine-dried before being graded.

The fabric load for particulate soil removal testing comprises a mixture of white cotton, polycotton (65% DACRON/35% cotton), and polyester (KODEL) swatches which are stained with a standardized illite clay soil. For the AMW, three 5 X 5 inch swatches of each fabric are used in each load, while in the Tergotometer, three 2% X 2% inch swatches of each fabric type are employed.

The results (expressed as relative clay removal index) for each formulation represent a percentage of the whiteness value achieved by a commercial synthetic detergent standard tested at the same time under identical conditions. This standard formulation hereinafter designated as A has the following composition by weight:

GRADING OF PERFORMANCE Swatches are graded before and after washing on a Gardner whiteness meter reading the L, a, and b coordinates. whiteness (W) is calculated as:

Performance is determined by finding the difference in whiteness (AW) before and after washing as:

w uller belore This is compared to the commercial Control Product A by calculating AW as a percentage of AW given by the Control Product in each batch.

The Relative Clay Removal Index AW for Test Sample X AW for Control Product A b. Grease and oil removal testing Identical equipment and washing conditions are used to evaluate grease and oil removal performance. The fabric load comprises a mixture of green polycotton (65% DACRON/35% cotton) and polyester (KODEL) swatches, four 2% X 2% inch swatches of each type being used in the tergotometer. Two triglyceride stains, namely bacon grease and vegetable oil, and two hydrocarbon-based stains, namely dirty motor oil and simulated lipid soil are employed.

Following washing and drying, the swatches are graded visually on a scale whose absolute values are described below:

5. Complete removal 4. Discernible stain remaining 3. Moderate amount of soil remaining 2. Large amount of soil remaining 1. Very large amount of soil remaining 0. No change, original amount of stain remaining As in the particulate soil removal performance test, the results are expressed as a percentage of the soil removal achieved by the standard A under the same conditions.

SUDSING EVALUATION In this Application, the evaluation of the sudsing,

and a circulating pump which is connected to the base of the cylinder and which discharges to an exit jet located in the cylinder above the level of the test solution. The desired solution temperature is maintained by heating tapes secured around tubing connecting the pump to the exit jet.

In operation, approximately 200 ml. of test solution is placed in the cylinder and continuously circulated at a selected temperature within the range of 70-125F. The force of the downward-directed solution from the exit jet onto the bulk of the test solution in the graduated cylinder generates a level of suds in the cylinder which is measured at one-minute intervals.

DETAILED DESCRIPTION OF THE INVENTION The compositions of the present invention contain two essential components, namely the ethoxylated zwitterionic compound and a surfactant compound. The zwitterionic and surfactant may be present in a ratio of from 99:1 to 1:99 by weight, preferably :1 to 1:10 by weight, and most preferably 4:1 to 1:10 by weight depending on the nature of the zwitterionic compound and the type of product to be formulated. For example, a product intended for prewash treatment of laundry to remove specific stains by direct application to the fabric will be formulated to contain a lower level of zwitterionic compound and different optional ingredients than a product designed as a main wash detergent.

For use as a main wash detergent, the level of ethoxylated zwitterionic compound in the product will lie in the range 535% by weight, preferably 1025%, and most preferably -20%, the level of the surfactant compound being 05-15%, preferably l10%, and most preferably l-5% by weight. Such a main wash detergent can be formulated as a conventional granule or as a liquid, paste, flake, ribbon, noodle, pellet, or tablet. As will be shown hereinafter, this formulation flexibility is due, at least in part, to the ability of the zwitterionic surfactants of the present invention to achieve satisfactory particulate soil removal performance equivalent to that of commercial heavy duty laundry detergents when used in blends with other surfactants.

ETHOXYLATED ZWITTERIONIC COMPOUNDS Ethoxylated zwitterionic compounds useful in the present invention may have one or other of the following formulae:

a. Mono-long chain derivatives In this derivative, R is a hydrocarbon moiety that can be a straight or branched chain C -C alkyl or alkenyl group or an alkaryl group in which the alkyl portion has 10-24 carbon atoms; R and R are C C alkyl or hydroxyalkyl groups; R, is a C -C alkylene, C -C alkenylene or 2-hydroxy propylene or 2- or 3- hydroxy butylene group or a C -C alkarylene group; X is a sulfonate or sulfate radical; and y has a value in the range 2-100.

In this embodiment, preferred groups for R are C C, alkyl, particularly C -C alkyl, while preferred groups for R and R are C alkyl and C hydroxyalkyl, the most preferred groups being methyland hydroxyethylradicals. The preferred range of values for y is 6-50, more preferably 6-25, and most preferably 912.

The synthesis of the above compounds can be achieved using readily available commercial starting materials. One such synthetic route is as follows. Sodium hydride is slowly and stoichiometrically reacted (2:1 molar ratio) with polyethylene glycol in a solution of tetrahydrofuran under an atmosphere of an inert gas, e.g., argon. The reaction is carried out over a period of 4-10 hours in an ice bath to cool the reaction, which is exothermic. The polyethylene glycol used is the commercially available material comprising a mixture of compounds having chain lengths from about 4 to about 100. The resultant product is the sodium salt represented by (I) N21*0(CH CH O) CH CI-I ONa wherein y can be, for example, 3, 21, 32, 67, or 99.

A stoichometric amount of tosyl chloride dissolved in tetrahydrofuran is then added slowly to reaction product (I), cooled in an ice bath, and the resultant mixture is stirred for 12 to 20 hours to form i.e., the polyethylene glycol ditosylate. Pyridine or other suitable base is added to the mixture, and the solution is then poured into ice water and acidified with l-ICl to a pH of about 2-3. The aqueous solution is then extracted with chloroform, rinsed with water and the chloroform extract is dried over sodium sulfate to give purified polyethylene glycol ditosylate (II).

The ditosylate (II) is then reacted with a tertiary amine of the structure (III) wherein R R and R are as defined above..The reaction of (III) with (II) is conveniently carried out neat, or with a suitable solvent as N,N-dimethyl formamide 7 or CH CN at temperatures of 80 to about 100C to produce a mixture of R. .H. cH..

cu so,-

and

(V) dicationic ammonium byproducts The mixture of (IV) and (V) is then dissolved in methanol and refluxed from 2040 hours with an aqueous solution of sodium sulfite. The unreacted (V) and other ionic materials are removed by contacting the above solution with a mixed bed ion exchange resin, followed by filtration of the solution and evaporation of the solvent to give, as the predominant zwitterionic product,

Compound (V1) can optionally be further purified using the mixed bed resin and tested for purity by thin layer chromatography.

It will be appreciated that zwitterionic compounds of the general formula (VI) can be prepared using any of a variety of tertiary amines (III). Moreover, zwitterionic compounds having any desired, specific degree of ethoxylation (y) can be prepared by fractionating the polyethylene glycol used in the reaction and using the desired fraction in the synthesis scheme. Alternatively, relatively narrowly defined distillation cuts of polyoxyethylene glycol having any desired average degree of ethoxylation, and containing individual compounds having differing degrees of ethoxylation within the desired range, can be used in the reaction. It will be further understood that sodium salt (I) can be reacted with a variety of epoxy compounds (e.g., butylene epoxide) or halohydrins (e.g., -chlorohexanol or 8- bromooctanol) to provide zwitterionics having various R groups within the scope of this invention.

A specific preparation of a mono-long chain ethoxylated zwitterionic compound useful in the present invention was as follows:

Preparation of 26-dimethyloctadecylammonio- 3 ,6,9,1 2,15 ,18,21,24 octaoxahexacosane- 1 -sulfonate Preparation of Nonaethyleneglycol (A) Under nitrogen, 46 grams (2 moles) of sodium pellets were added cautiously to 2,664 ml (20 moles) of previously dried and distilled triethyleneglycol. The temperature was kept below 100C. After all the sodium had reacted, the temperature was adjusted to 100C and 187 grams (1 mole) of 1,2-bis-(2-chloroethoxy) ethane was added in a slow stream. The mixture was heated overnight at 100C (still under nitrogen) and then filtered hot to remove most of the sodium chloride. Excess triethyleneglycol was stripped under vacuum and the mixture was again filtered while hot. The material was purified by molecular distillation and has a b.p. of 170175C at 0.001 mm.

8 Preparation of Nonaethyleneglycol ditosylate (B) The nonaethyleneglycol (A), 300 grams, (0.72 moles) was dissolved in 800 ml (10.3 moles) of dry pyridine and cooled to 0C. Tosyl chloride (i.e., p-toluene-sulfonyl chloride, 420 grams, 2.2 moles) was added, with stirring, in small portions. After the addition was complete, the temperature increased to 10C and the clear reaction mixture became cloudy. The mixture was stirred at 0-l0C for an additional 3 hrs., then poured into an equal volume of ice water and acidified to pH 2-3 with 6N HCl. The aqueous solution was then extracted 3 times with CHCl The Cl-ICl was washed with water, sodium bicarbonate solution, and again with water, then dried over anhydrous sodium sulfate. Evaporation of the CHCl gave 520 grams of a slightly yellow oil. Thin layer chromatography indicated an impurity which remained at the origin. The oil was dissolved in warm benzene (40C) and extracted with warm water to remove the polar impurity. The benzene was dried filtered and concentrated to yield 423 grams of a yellowish oil (B).

Preparation of dimethyloctadecyl-Z6-tosyloxy- 3,6,9,12,15,1 8,21,24 octaoxahexacosylammonium tosylate (C) The ditosylate (B) 86.7 grams (0.12 mole) and 35.8 grams of distilled dimethyloctadecylamine were heated at reflux for 5 hrs. in 400 ml of acetonitrile. The solvent was then removed to give 120 grams of a mixture consisting of the monoquaternary tosylate (C), diquaternary ammonium byproduct (D) and some unreacted ditosylate (B).

Preparation of 26-dimethyloctadecylammonio- 3 ,6,9.12,l5 ,18,21,24 octaoxahexacosane- 1 -sulfonate The mixture of monoquat (C) and diquaternary am- I monium byproduct (D) prepared above was dissolved in 1 liter of methanol. Sodium sulfite grams, 0.79 mole) was added and the reaction mixture was refluxed with stirring for 5 hours. Additional methanol was added and the insoluble salts were filtered. The solvents were removed to yield a solid product. Purification The above solid reaction product was dissolved in 1 liter of methanol and stirred with 386 grams of a mixed bed (Rexyn 300 H-OH, commercially available from the Fisher Scientific Co.) resin for 5 hours. The solution was then passed through a column of fresh resin (350 grams of Rexyn 30C) at a rate of 2 liters per 7 hours. The methanol solution was then concentrated to yield 31.8 grams of a light yellow oil which was recrystallized from acetone to give a white crystalline, hygroscopic product. This product was identified as the title compound (E in the following schematic).

The following sequence sets forth the above procedure in abbreviated form to clarify the structures of compounds prepared thereby. 1n the sequence, the dimethyloctadecylamine can be replaced by dimethylhexadecylamine, dimethylnonadecylamine, dimethyleicosylamine, and dimethyldocosylamine, respectively, and the corresponding compounds wherein R is C C C and C are secured, respectively.

-continued (D) Diquaternary ammonium byproduct 2cH so,-,Na

b. Di-long chain derivatives in this derivative, both R and R are hydrocarbon moieties that can be straight or branched chain C -C alkyl or alkenyl groups; R R and X are as in (i) (a.) above and y has an average value in the range 6-100. Preferably R and R are identical and comprise alkyl groups each having 10 to 16 carbon atoms, most preferably alkyl groups each having 10 to 24 carbon atoms. Preferred values for y lie in the range 9 to 50, most preferably in the range 12 to 25.

A specific preparation of a di-long chain alkyl ethoxylated zwitterionic compound useful in the present invention was as follows:

Methylation of di-n-octylamine was accomplished by slowly mixing 50 grams of the secondary amine with, first, formic acid (30.03 grams), and then formaldehyde, at C. The reaction mixture was kept at 80C for 24 hours, then adjusted to pH 8-9 with NaOH solution. The resulting tertiary amine was extracted with CHCl and dried over Na SO The tertiary amine (25.6 grams, 0.10 mole) was then refluxed with 72 grams (0.10 mole) of nonaethylene glycol ditosylate (compound B, prepared as in the previous procedure) in acetonitrile for 6 hours. The solvent was evaporated and the resulting mixture of monoand diquaternary compounds was dissolved in methanol and refluxed with 100 grams of sodium sulfite (predissolved in water) for 16 hours. Excess sulfite and other salts were filtered and the filtrate was stirred for 16 hours with 500 grams of a mixed bed resin (Rexyn 300). A second treatment with fresh resin was necessary to remove all impurities. The solvents were evaporated to complete dryness and the product, 22 grams of a light yellow viscous oil, was identified as or 26-dioctylmethylammonio-3,6,9,12,15 ,l 8,21 ,24- octaoxahexacosane- 1 -sulfonate.

c. Tri-long chain derivatives In this derivative, R R R are all hydrocarbon moieties that can be straight or branched chain C -C alkyl or alkenyl groups; R and x are as in (i) (a.) and (b.) above and y has a value in the range 6-100. Preferably R R and R are each identical and each comprise an alkyl group having 8-16 carbon atoms in the chain. Most preferably each chain contains 8-12 carbon atoms. y has a preferred value in the range 9-50, most preferably in the range 12-50.

A specific preparation of a tri-long chain alkyl ethoxylated zwitterionic compound was as follows:

Tri-n-octylamine was distilled to insure purity and 42 grams of the purified product (0.12 mole) was reacted with 87 grams (0.12 mole) of the ditosylate of nonaethylene glycol (compound B in the mono-long chain preparation) in dry N,N-dimethylformamide at C for 2 hours. The dimethylformamide was removed and the mixture of monoand diquaternary material was dissolved in methanol. This mixture was refluxed for 16 hours with 100 grams of NA SO predissolved in water. The insoluble salts were filtered and the filtrate was stirred with 500 grams mixed bed resin (Rexyn 300 HOH) for 24 hours. An additional treatment with 500 grams fresh resin was used to further purify the product. Thin layer chromatography still indicated an impurity, which was subsequently removed by dissolving the product in H O, acidifying to pH 4, and extracting with CHCI The CHC1 extract was rinsed with sodium bicarbonate, dried and evaporated to give a light yellow viscous oil, identified as or trioctylammonio-3,6,9,12,15,18,21,24-octaoxahex- In this structure, R, can be a linear or branched C;,C alkyl or alkenyl group, preferably a C1848 alkyl or alkenyl group; R can also be a C -C alkyl or alkenyl group or can be a C -C alkyl or hydroxyalkyl group, preferably a methyl group; and X can be a sulfonate or sulfate radical.

The number of ethylene oxide groups in each chain can be from 1 to 100 but their sum should be greater than 10. Normally there will be approximately the same number in each chain, the sum of the groups in both chains preferably having a value in the range 12-50 and most preferably in the range 12-25.

The preparation of zwitterionic compounds of this type is accomplished using commercially available starting materials. A typical starting material is mar- 1 1 keted under the tradename Ethoquad, by the Armak Company of the Armour Company. Ethoquad is a mixture of quaternary ammonium compounds whose predominant component is a di-ethoxylate of the structure wherein y and x are each non-zero integers whose average sum is, for example, 5, 10, 15, 50, depending on the cut selected, and R and R are C C alkyl and C -C alkyl, respectively.

In general terms, the compounds herein are prepared by dissolving Ethoquad in pyridine or other suitable base and cooling the mixture to a temperature of about C. Tosyl chloride is slowly added to the Ethoquad mixture at a 1:1 stoichiometric ratio while the reaction mixture is kept at about 0C5C in an ice bath. The mixture is then stirred for about 24 hours at OC-5C. At the end of that time the reaction mixture is poured into water and acidified to a pH of 2-3 with HCl.

The foregoing acidified reaction mixture is then extracted with chloroform and the extract is rinsed first with sodium bicarbonate solution, then with water; the extract is then dried over anhydrous sodium sulfate. After evaporation of the chloroform extract, an oily residue is obtained. This is the mono-tosylate ester of the structure can (camp- 2 CH:

N+ 01- CH, c,n,o ,n

wherein y and x are as above.

The foregoing tosylate ester is then dissolved in methanol and refluxed for about 24 hours with about a molar excess of sodium sulfite predissolved in H O. The reaction mixture is cooled and excess sodium sulfite and sodium tosylate are removed by filtration. The filtrate is stirred with a mixed bed (anion-cation) resin to purify the product. A second resin treatment can optionally be used to remove substantially all traces of all cationic and anionic impurities. The purified monosulfonate corresponding to (I) above is recovered by evaporating the solvent. The product can optionally be recrystallized from acetone.

iii) M (11) where R R and X are as in (ii) and y and x each have a value in the range of l-lOO provided that the sum of y x 2 10. Preferred values for the sum of y x will lie in the range 12-50 and most preferably in the range 15-25. The cation M can be alkali metal, ammonium, and alkanolammonium, e.g. ethanolammonium or methanolammonium but is most preferably sodium.

The disulfonate (II) is prepared in the same manner as the mono-sulfonate (l), but using excess tosyl chloride (about 3:1 mole ratio, or greater) in the first step and a larger excess of sodium sulfite (20:1 mole ratio) in the second step. If a cation, M, other than sodium is desired in the final product, the corresponding sulfite can be used in the second step. Alternatively, the sodium form of compound (II) can be ion-exchanged in standard fashion to any desired cation, M. The resin purification treatment is unnecessary when preparing the disulfonate. v

The sulfates of the type (I) and (II) are easily prepared by reacting one of two moles of chlorosulfonic acid with the Ethoquads, respectively. The same consideration with regard to selection of cation M holds true for the sulfates as for the sulfonates.

It will be appreciated that a variety of diethoxylated amino starting materials can be employed in the fore-- going reaction scheme. For example, Ethoquad derivatives having variations in groups R and R are commercially available, e.g., compounds wherein R is an average C cut. Moreover, precursor compounds having varying sums of y and x (within the recited range) can be selected according to the desires of the user. Compounds wherein y and x are of approximately equal length, the sum of y and x being from about 12 to about 25, most preferably fom 15 to about 25, are especially useful herein.

It will be further appreciated that a variety of other starting materials can be employed to prepare various di-ethoxylated precursors of the present zwitterionic compounds. For example, the Ethomeens (a tradename of a clas of compounds marketed by the Armak Company, a division of the Armour Company) can be quaternized to produce variations of the commercial Ethoquads. Thus, Ethomeens of the general formula reacted with excess alkyl iodide or hydroxy-substituted alkyl iodide (Cl-I 1, C l-1 L etc.) to produce a quaternary ammonium compound which can be sulfated or sulfonated on one or both ethylene oxide groups in the manner disclosed above.

It should be appreciated that mixtures of any of these zwitterionic compounds in any proportions may be used in the compositions of the present invention. Such 2 mixtures may be produced intentionally by blending individual species or may arise as a result of the choice of feedstocks or as a result of the processing steps involved.

The ethoxylated zwitterionic compounds useful in the present invention desirably display appreciable solubility in aqueous media. A solubility in water at 25C of at least 50 ppm, preferably more than ppm appears to be necessary for satisfactory particulate soil removal performance, but the preferred materials have solubilities in water of 10-30% by weight.

The second essential component of a composition in accordance with the present invention is an organic detergent. This can be present at a level of from l-99% by weight of the composition, the actual level being dependent on the end use of the composition and its desired physical form.

A wide range of organic detergents can be mixed i.e. can be considered compatible with the ethoxylated zwitterionic compounds to form compositions useful in the present invention. In the context of this invention compatible is defined as causing no appeciable decrease in the ability of the ethoxylated zwitterionic compound to remove and suspend particulate soil.

Classes of compatible detergents that can serve as cosurfactants include the nonionic, zwitterionic, and

ampholytic surfactants which can be used in a broad range of proportions to the ethoxylated zwitterionic compound. In contrast, most anionic detergents do not enhance the particulate soil removal performance of the ethoxylated zwitterionic compounds to the same extent, especially on synthetic fibers, although delayed solubility of the anionic surfactant improves the performance of the combination. Amongst the cationic surfactants, only those having a polyoxyalkylene function are compatible with the ethoxylated zwitterionic compounds useful in the present invention.

NONIONIC SYNTHETIC DETERGENTS Most commonly, nonionic surfactants are compounds produced by the condensation of an alkylene oxide (hydrophilic in nature) with an organic hydrophobic compound which is usually aliphatic or alkyl aromatic in nature. The length of the hydrophilic or polyoxyalkylene moiety which is condensed with any particular hydrophobic compound can be readily adjusted to yield a water-soluble compound having the desired degree of balance between hydrophilic and hydrophobic elements. Another variety of nonionic surfactant is the semi-polar nonionic typified by the amine oxides, phosphine oxides, and sulfoxides.

Examples of suitable nonionic surfactants include:

1. The polyethylene oxide condensates of alkyl phenols. These compounds include the condensation products of alkyl phenols having an alkyl group containing from about 6 to 12 carbon atoms in either a straight chain or branched chain configuration, with ethylene oxide, the said ethylene oxide being present in amounts equal to to 25 moles of ethylene oxide per mole of alkyl phenol. The alkyl substituent in such compounds may be derived, for example, from polymerized propylene, diisobutylene, octene, or nonene. Examples of compounds of this type include nonyl phenol condensed with about 9.5 moles of ethylene oxide per mole of nonyl phenol, dodecyl phenol condensed with about 12 moles of ethylene oxide per mole of phenol, dinonyl phenol condensed with about moles of ethylene oxide per mole of phenol, di-isooctylphenol condensed with about 15 moles of ethylene oxide per mole of phenol. Commercially available nonionic surfactants of this type include lgepal CO-6l0 marketed by the GAP Corporation; and Triton X-45, X-l l4, X-100 and X- 102, all marketed by the Rohm and Haas Company.

2. The condensation products of aliphatic alcohols with ethylene oxide. The alkyl chain of the aliphatic alcohol may either be straight or branched and generally contains from about 8 to about 22 carbon atoms. Examples of such ethoxylated alcohols include the condensation product of about 6 moles of ethylene oxide with 1 mole of tridecanol, myristyl alcohol condensed with about 10 moles of ethylene oxide per mole of myristyl alcohol, the condensation product of ethylene oxide with coconut fatty alcohol wherein the coconut alcohol is a mixture of fatty alcohols with alkyl chains varying from 10 to 14 carbon atoms and wherein the condensate contains about 6 moles of ethylene oxide per mole of alcohol, and the condensation product of about 9 moles of ethylene oxide with the abovedescribed coconut alcohol. Examples of commercially available nonionic surfactants of this type include Tergitol l5-S-9 marketed by the Union Carbide Corporation, Neodol 23-6.5 marketed by the Shell Chemical Company and Kyro EOB marketed by The Procter & Gamble Company. Preferred nonionic surfactants R being selected from the group consisting of hydrogen and mixtures thereof with not more than 40% by weight of lower alkyl, wherein R and R together form an alkyl residue having a mean chain length in the range of 8-15 carbon atoms, at least 65% by weight of said residue having a chain length within 1': 1 carbon atoms of the mean, wherein 3.5 n,,,, 6.5 provided that the total amount by weight of components in which n 0 shall be not greater than 5% and the total amount by weight of components in which n 2-7 inclusive shall be not less than 63% based on the total weight of the, or each, said ethoxylate material and the I-ILB of the or each said ethoxylate material shall lie in the range 9.5-11.5, said composition being otherwise free of nonionic surfactants having an l-ILB outside of this range.

Preferred embodiments of this invention utilize blends of primary alcohols in which at least and most preferably by weight of the alcohol has a chain length within i 1 carbon atom of the mean, wherein the amount of unethoxylated alcohol is less than 1% by weight and wherein the amount of ethoxylated alcohols having 2-7 ethylene oxide groups is at least 70% by weight. Preferably ethoxylates having a mean chain length of C and below contain at least 55% by weight of material having 2-6 ethoxylate groups while for ethoxylates having a chain length of C C at least 5 5 by weight of the material has 3-7 ethoxylate groups. Ethoxylates having a chain length in the C range preferably have at least 55% by weight of E -E material. In the preferred embodiments of the invention the I-ILB of the ethoxylates are in the range 10.0-1 L1.

3. The condensation products of ethylene oxide with a hydrophobic base formed by the condensation of propylene oxide with propylene glycol. The hydrophobic portion of these compounds has a molecular weight of from about 1500 to 1800 and of course exhibits water insolubility. The addition of polyoxyethylene moieties to this hydrophobic portion tends to increase the water-solubility of the molecule as a whole, and the liquid character of the product is retained up to the point where the polyoxyethylene content is about 50% of the total weight of the condensation product. Examples of compounds of this type include certain of the commercially available Pluronic surfactants marketed by the Wyandotte Chemicals Corporation.

4. The condensation products of ethylene oxide with the product resulting from the reaction of propylene oxide and ethylene diamine. The hydrophobic base of these products consists of the reaction product of ethylene diamine and excess propylene oxide, said base having a molecular weight of from about 2500 to about 3000. This base is condensed with ethylene oxide to the extent that the condensation product contains from about 40 to about 80% by weight of polyoxyethylene and has a molecular weight of from about 5,000 to about 1 1,000. Examples of this type of nonionic surfactant include certain of the commercially available Tetronic compounds marketed by the Wyandotte Chemicals Corporation.

5. Surfactants having the formula RR R N O (amine oxide surfactants) wherein R is an alkyl group containing from about 10 to about 18 carbon atoms, from to about 2 hydroxy groups and from 0 to about ether linkages, there being at least one moiety of R which is an alkyl group containing from about to about 18 carbon atoms and no ether linkages, and each R and R is selected from the group consisting of alkyl groups and hydroxyalkyl groups containing from 1 to about 3 carbon atoms;

Specific examples of amine oxide surfactants include: dimethyldodecylamine oxide, dimethyltetradecylamine oxide, ethylmethyltetradecylamine oxide, cetyldimethylamine oxide, dimethylstearylamine oxide, cetylethylpropylamine oxide, diethyldodecylamine oxide, diethyltetradecylamine oxide, dipropyldodecylamine oxide, bis-(2-hydroxyethyl)dodecylamine oxide, bis- (2-hydroxyethyl)-3-dodecoxy-2-hydroxypropylamine oxide, (2-hydroxypropyl )methyltetradecylamine oxide, dimethyloleylamine oxide, dimethyl-(2-hydroxydodecyl)amine oxide, and the corresponding decyl,

hexadecyl and octadecyl homologs of the above compounds.

6. Surfactants having the formula R R R P O (phosphine oxide surfactants) wherein R is an alkyl group containing from about 10 to about 28 carbon atoms, from 0 to about 2 hydroxy groups and from O to about 5 ether linkages, there being at least one moiety of R which is an alkyl group containing from about 10 to about l8 carbon atoms and no ether linkages, and

(sulfoxide surfactants) wherein R is an alkyl group containing from about 10 to about 18 carbon atoms, from 0 to about 5 ether linkages and from 0 to about 2 hydroxyl substituents, at least one moiety of R being an alkyl group containing no ether linkages and containing from about 10 to about 18 carbon atoms, and wherein R is an alkyl group containing from 1 to 3 carbon atoms and from zero to two hydroxyl groups.

16 Specific examples of sulfoxide surfactants include octadecyl methyl sulfoxide, dodecyl methyl sulfoxide, tetradecyl methyl sulfoxide, 3-hydroxytridecyl methyl sulfoxide, 3-methoxytridecyl methyl sulfoxide, 3-hydroxy- 4-dodecoxybutyl methyl sulfoxide, octadecyl 2-hydroxyethyl sulfoxide, and dodecylethyl sulfoxide.

Table 1 illustrates the clay soil removal performance of mixtures of ethoxylated zwitterionic compounds and various nonionic surfactants. Experimental Run 1 shows that the C ethoxylated zwitterionic material alone at a level of 250 ppm in water closely approaches the cleaning performance of the fully formulated control product A on polyester and polycotton fabrics and achieves a major proportion of the control product performance on cotton. Experimental Run 2 shows that an appreciable proportion of this performance is retained at half the level of the ethoxylated zwitterionic compound. The addition of ppm of several different nonionic cosurfactants in Runs 3, 5, 7, and 9 to the C ethoxylated zwitterionic material enables the performance at 250 ppm to be approached and even exceeded, the extent of the recovery being dependent on the cosurfactant type. It can also be seen that the addition of sodium tripolyphosphate to these systems, while providing an additional benefit in one or two instances, does not give an overall advantage. While the reason for this is not fully understood, it is believed that the lack of benefit is a function of the ability of the better ethoxylated zwitterionic compounds, of which the C compound is an example, to remove soil in the presence of free mineral hardness ion.

Experimental Runs 11-20 inclusive record similar data for the C ethoxylated compound which, as Runs l l and 12 demonstrate, is not as effective a material on its own as the C ethoxylated compound. However, Runs 13, 15, 17, and 19 again show that the performance of the C ethoxylated compound at 125 ppm can be improved by the addition of various nonionic surfactants, the improvement being seen over all fabric types and in almost every instance providing performance that exceeds that for the C material at 250 ppm. Addition of sodium tripolyphosphate at 250 ppm leads to a further performance improvement which is not inconsistent with the theory that the benefit that can be derived from detergent builders in compositions of the present invention is related to the particulate soil removal performance of the ethoxylated zwitterionic materials.

Table V is a presentation of the grease and oil removal performance achieved by detergent compositions of the present invention. Runs 4 and 5 show respectively combinations of 125 p.p.m. C ethoxylated zwitterionic compound of Table l with 125 ppm of Neodol 45 E7 and with 125 ppm of G secondary alcohol ethoxylate (Tergitol 15-S-9 marketed by Union Carbide Corporation). Runs 11 and 12 give the same data for the C ethoxylated zwitterionic of Table 1. For both C and C ethoxylated zwitterionic compounds advantages can be seen on polyester fabric for the combinations relative to the performance of the ethoxylated zwitterionic compound alone at 250 ppm.

Thus for compositions of nonionic surfactants with ethoxylated zwitterionic materials useful in the present invention, it can be seen that for ethoxylated zwitterionics having good particulate soil removal performance, nonionic surfactants can be used to reduce the level of ethoxylated zwitterionic necessary to achieve a 17 18 given level of performance. For ethoxylated zwitterionformance, the level of performance can be raised by ics not having such good particulate soil removal perthe addition of nonionic surfactants and builders.

TABLE I CLAY SOIL REMOVAL OF ETl-IOXYLATED ZWITI'ERIONIC COMPOUNDS IN COMBINATION WITH NONIONIC SURFACTAN'I'S Conditions: 10 Minute Tergotometer Wash in 7 grain/gal. Mineral Hardness (2:1 CazMg) at 105F IVE RELAT ETHOXYLATED LEVEL LEvEL LEVEL CLAY REMOVAL INDEX ZWI'I'IERIONIC PPM IN PPM IN BUILD- PPM IN POLY- POLY- ER NO. COMPOUND SOLUTION COSURFACTANT SOLUTION TYPE SOLUTION CO'IION COTION ESTER 1 N-C H 1439-1515011 250 75 96 95 c t-nmnctncn so 2 125 62 88 77 3 125 Neodol 45-7* 125 91 91 86 4 125 125 STP 250 so 100 71 5 125 Stripped c e 125 s7 91 74 6 125 125 STP 250 96 116 98 7 125 CnE 125 35 89 86 s 125 125 STP 250 so 100 71 9 125 Ethomeen I8/60**** 125 7s 96 so 10 125 125 STP 250 90 113 88 1 1 N-C H N,NbisCI-I 250 53 69 46 (C I-I,O) CH,CH SO 1 125 41 52 24 13 125 Neodol 45-7* 125 68 81 51 14 125 125 STP 250 78 9s 94 15 125 Stripped C E, 125 57 92 52 16 125 125 STP 250 78 9s 94 17 125 CnEJ" 125 74 84 49 1s 125 125 STP 250 so 93 59 19 125 Ethomeen I8/60**** 125 73 :39 43 20 125 125 STP 250 68 86 55 21 Formulation A 1400 100 100 100 Neodol -7 is a linear primary C alcohol containing I5% 2-methyl branching condensed with an average of seven moles of ethylene oxide per mole of alcohol. marketed by Shell Chemical Company.

"Stripped C E, is a linear primary C alcohol condensed with approximately 3 moles of ethylene oxide per mole of alcohol and then stripped to remove at least 95% of the unethoxylated alcohol and a proportion of the monoethoxylate, so as to leave a condensate having a mean of 4 moles ethylene oxide per mole of alcohol. '"Middle cut coconut alcohol condensed with an average of 6 moles of ethylene oxide per mole of alcohol.

""Ethomeen 18/60 is a tertiary C amine having 2 ethoxy side chains directly attached to the nitrogen atom and containing a total of ethylene oxide groups.

TABLE V GREASE AND OIL REMOVAL OF ETHOXYLATED ZWI'ITERIONICS IN COMBINATION WITH OTHER SURFACTANTS Conditions: 10 Minute Tergotometer Wash at I00"F in 5.5 grains/gal. Mineral Hardness (CazMg 3zl) RELATIVE ETI-IOXYLATED LEVEL LEVEL LEVEL SOIL REMOVAL INDEX ZWI'I'I'ERIONIC PPM IN PPM IN BUILD- PPM IN POLYCO'I'ION POLYESTER ER NO. COMPOUND SOLUTION COSURFACTANT SOLUTION TYPE SOLUTION TG HG TG HC 1 N-C, H,;, N,NbisCH (CI-I,CH O),CH,CH,S0 250 91 I32 I02 2 125 c @so NO 125 as 157 91 3 125 c -c alkyl 125 59 100 35 21 (EO) OSO Na 4 I25 C -C primary I25 62 83 9] 126 alcohol condensed with 7 moles ethylene oxide 5 I25 C -C secondary I25 I00 I36 86 I09 alcohol condensed with9 moles ethylene oxide 6 I25 3(N-C I'I.-,;N- 125 80 58 III 126 ,Ndimethy ammonio )propane-l -sulphonate 7 I25 3(N-C, alkyl 125 78 I63 75 127 N,N-dimethyl ammonio)2-hydroxypropanel -sulphonate 8 NC I-I,, N,NbisCH (CI-I,CH,O) CH,CH,SO, 250 I00 75 80 99 9 125 c c I25 88 I07 H8 I35 10 I25 C -C alkyl 125 55 43 36 (EO) OSO,Na 1 I25 C -C primary I25 5O 58 89 I29 alcohol condensed with 7 moles ethylene oxide l2 I25 C C,, secondary I25 57 36 79 I16 alcohol condensed with 3 moles ethylene oxide 13 I25 3(N-C,,I-I;,N- I25 120 42 I24 I31 GREASE AND OIL REMOVAL OF ETHOXYLATED ZWI'I'IERIONICS IN COMBINATION WITH OTHER SURFACTANTS Conditions: 10 Minute Tergotometer Wash at IF in 5.5 grains/gal. Mineral Hardness (CazMg 3:1)

RELATIVE ETHOXYLATED LEVEL LEVEL LEVEL SOIL REMOVAL INDEX ZWITTERIONIC PPM IN PPM IN BUILD- PPM IN POLYCO'I'ION POLYESTER ER NO. COMPOUND SOLUTION COSURFACTANT SOLUTION TYPE SOLUTION 'IG HG TG I-IC ,Ndimethyl ammonio )propane- I -sulphonate l4 12S 3(N-C alkyl I25 47 88 H2 133 N,N-dimethyl ammonio )-2-hydroxypropanel -sulphonate AMPHOLYTIC SYNTHETIC DETERGENTS Ampholytic synthetic detergents can be broadly described as derivatives of aliphatic or aliphatic derivatives of heterocyclic secondary and tertiary amines in which the aliphatic radical may be straight chain or branched and wherein one of the aliphatic substituents contains from about 8 to 18 carbon atoms and at least one contains an anionic water-solubilizing group, e.g., carboxy, sulfonate, sulfato. Examples of compounds falling within this definition are sodium 3- (dodecylamino )propionate, sodium 3-(dodecylamino propane-l-sulfonate, sodium 2-(dodecylamino)ethyl sulfate, sodium Z-(dimethylamino)octadecanoate, disodium 3-(N-carboxymethyldodecylamino )propanel sulfonate, disodium octadecyl-iminodiacetate, sodium l-carboxymethyl-2-undecylimidazole, and sodium N,N-bis(Z-hydroxyethyl)-2-sulfato-3-dodecoxypropylamine. Sodium 3-(dodecylamino)propane-l-su1- fonate is preferred.

ZWITTERIONIC SYNTHETIC DETERGENTS Zwitterionic surfactants can be broadly described as derivatives of secondary and tertiary amines, derivatives of heterocyclic secondary and tertiary amines, or derivatives of quaternary ammonium, quaternary phosphonium or tertiary sulfonium compounds. The cationic atom in the quaternary compound can be part of a heterocyclic ring. In all of these compounds there is at least one aliphatic group, straight chain or branched, containing from about 3 to 18 carbon atoms and at least one aliphatic substituent containing an anionic water-solubilizing group, e.g., carboxy, sulfonate, sulfate, phosphate, or phosphonate. Examples of various classes of zwitterionic surfactants operable herein are described as follows:

1. Compounds corresponding to the general formula wherein R is alkyl, alkenyl or a hydroxyalkyl containing from about 8 to about 18 carbon atoms and containing if desired up to about ethylene oxide moieties and/or a glyceryl moiety; Y is nitrogen, phosphorus or sulfur, R is C -C alkyl or a C -C B- or ymonohydroxy alkyl containing I to 3 carbon atoms; x is I when Y is S, 2 when Y is N or P; R is C -C alkylene or 2-hydroxy-, 3-propylene or 2- or 3-hydroxy butylene containing from 1 to about 5 carbon atoms; and Z is a carboxy, sulfonate, sulfate, phosphate or phosphonate group. Examples of this class of zwitterionic surfactants include 3-(N,N-dimethyl-N-hexadecylammonio )-propanel -sulfonate; 3-( N,N-dimethyl-N-hexadecylammonio )-2-hydroxypropanel -sulfonate; N,N-dimethyl-N-dodecylammonio acetate; 3- (N,N-dimethyl-N-dodecylammonio)propionate; 2- (N,N-dimethyl-N-octadecylammonio)ethyl sulfate; 3 P,P-dimethyl-P-dodec ylphosphonio )propanel -sulfonate; 2-(S-methyl-S-tert-hexadecylsulfonio)ethanel-sulfonate; 3-(S-methyl-S-dodecylsulfonio)propionate; 4-(S-methyl-S-tetradecylsu1fonio)butyrate; 3- (N ,N-dimethyl-N-4-dodecenylammonio )propane- 1 sulfonate; 3-(N,N-dimethyl-N-2-diethoxyhexadecylammonio)propy1 hydrogen phosphate; and 3-(N,N- dimethyl-N-4-glyceryldodecylammonio )propionate.

Preferred compounds of this class from a commercial standpoint are 3-(N,N-dimethyl-N-hexadecylammonio)-2-hydroxypropane-l-sulfonate; 3-(N,N-dimethyl-N- alkylammonio )-2-hydroxypropane-l -sulfonate, alkyl group being derived from tallow fatty alcohol; 3-( N,N-dimethyI-N-hexadecylammonio )propane-l suffonate; 3-(N,N-dimethyl-N-tetradecylammonio)- propane- I -sulfonate; 3-(N,N-dimethyl-N-alkylammonio )-2-hydroxypropane-l-sulfonate, the alkyl group being derived from the middle cut of coconut fatty alcohol; 3-(N,N-dimethyldodecylammonio)-2-hydroxypropane-l -sulfonate; 4-(N,N-dimethyl-tetradecylammonio)butanel -sulfonate; 4-(N,N-dimethyl-N-hexadecylammonio )butane- I -sulfonate; 4-(N,N-dimethylhexadecylammonio)butyrate; 6-(N,N-dimethyl-N- octadecylammonio)hexanoate; 3-(N,N-dimethyl-N- eicosylammonio )-3-methylpropanel -sulfonate; and 6-(N,N-dimethyl-N-hexadecylammonio)hexanoate.

Means for preparing many of the surfactant compounds of this class are described in US. Pat. Nos. 2,129,264, 2,774,786, 2,8l3,898, 2,828,332 and 3,529,521 and; German Pat. No. 1,018,421 all incorporated herein by reference.

2. Compounds having the general formula:

wherein R is an alkyl, cycloalkyl, aryl, aralkyl or alkaryl group containing from I0 to 20 carbon atoms; M is a bivalent radical selected from the group consisting of aminocarbonyl, carbonylamino, carbonyloxy, oxycarbonyloxy, aminocarbonylamino, the corresponding thio groupings and substituted amino derivatives; R and R are alkylene groups containing from I to 12 carbon atoms; R is alkyl or hydroxyalkyl containing from I to 10 carbon atoms; R, is selected from the the group consisting of R groups R MR and R COOMe wherein R R R and R are as defined above and Me is a monovalent salt-forming cation. Compounds of the type include N,N-bis(oleylamidopropyl)- N-methyl-N-carboxymethylammonium betaine; N,N- bis(stearamidopropyl)-N-rnethyl-N-carboxymethylammonium betaine; N-(stearamidopropyl)-N-dimethy1-N- carboxymethylammonium betaine; N,N-bis- (oleylamidopropyl)-N-(2-hydroxyethyl)-N-carboxymethylammonium betaine; and N-N-bis-(stearamidopropyl)-N-( 2-hydroxyethyl)-N-carboxymethylammonium betaine. Zwitterionic surfactants of this type are prepared in accordance with methods described in US. Pat. No. 3,265,719 and DAS 1,018,421.

3. Compounds having the general formula:

wherein R is an alkyl group, R is a hydrogen atom or an alkyl group, the total number of carbon atoms in R and R being from 8 to 16 and represents a quaternary ammonio group in which each group R R and R is an alkyl or hydroxyalkyl group or the groups R R and R are conjoined in a heterocyclic ring and n is 1 or 2. Examples of suitable zwitterionic surfactants of this type include the y and 8 hexadecyl pyridino sulphobetaines, the 'y and 8 hexadecyl 'ypicolino sulphobetaines, the 7 and 8 tetradecyl pyridino sulphobetaines and the hexadecyl trimethylammonio sulphobetaines. Preparation of such zwitterionic surfactants is described in British patent specification No. 1,277,200.

4. Compounds having the general formula wherein R is an alkarylmethylene group containing from about 8 to 24 carbon atoms in the alkyl chain; R is selected from the group consisting of R groups and alkyl and hydroxyalkyl groups containg from 1 to 7 carbon atoms; R is alkyl or hydroxyalkyl containing from 1 to 7 carbon atoms; R is alkylene or hydroxyalkylene containing from 1 to 7 carbon atoms and Z is selected from the group consisting of sulfonate, carboxy and sulfate. Examples of zwitterionic surfactants of this type include 3-(N-4-n-dodecylbenzyl-N,N-dimethylammonio)propane-l-sulfonate; 4-(N-4-n-dodecylbenzyl-N,N-dimethylammonio)butane-1-sulfonate; 3- (N-4-n-hexadecylbenzyl-N,N-dimethylammmonio)- propane- 1 -sulfonate; 3-( N-4-n-dodecylbenzyl-N,N- dimethylammonio)propionate; 4-(N-4-n-hexadecylbenzyl-N,N-dimethylammonio)butyrate; 3-(N-4-n-tetradecylbenzyl-N,N-dimethylammonio)propane-1-sulfate; 3-(N-4-n-dodecylbenzyl-N,N-dimethylammonio)- Z-hydroxypropane- 1 -su1fonate; 3-[N,N-di(4-ndodecylbenzyl)-N-methylammonio]propane-1-sulfonwherein R is an alkylphenyl, cycloalkylphenyl or alkenylphenyl group containing from 8 to 20 carbon atoms, in the alkyl, cycloalkyl or alkenyl moiety; R and R are each aliphatic groups containing from 1 to 5 carbon atoms; R and R are each hydrogen atoms, hydroxyl groups or aliphatic groups containing from 1 to 3 carbon atoms and R is an alkylene group containing from 2 to 4 carbon atoms.

Examples of zwitterionic surfactants of this type include 3-(N-dodecylphenyl- N,N-dimethylammonio)- propane-1 -su1fonate; 4-(N-hexadecylphenyl-N ,N- dimethylammonio)butane-l-sulfonate; and 3-(N- dodecylphenyl-N,N-dimethylammonio)-2-hydroxypropane-l-sulfonate. Compounds of this type are described more fully in British Pat. Nos. 970,883 and 1,046,252, incorporated herein by reference.

Of all the above-described types of zwitterionic surfactants, preferred compounds include 3(N,N-dimethyl-N-alkylammonio )-propane- 1 -sulfonate and 3 (N ,N- dimethyl-N-alkylammonio)-2-hydroxypropane-1-sulfonate wherein in both compounds the alkyl group averages 14.8 carbon atoms in length; 3(N,N-dimethyl- N-hexadecylammonio)-propanel -sulfonate; 3(N ,N- dimethyl-N-hexadecylammonio)-2-hydroxypropane-1- sulfonate; 3-(N-dodecylbenzyl-N,N-dimethylammonio)-propane-1-sulfonate; 3-(N-dodecylbenzyl- N ,N ,dimethylammonio)-2-hydr0xypropane-1-sulfonate; N-dodecylbenzyl-N,N-dimethylammonio acetate; 3-(N-dodecylbenzyl-N,N-dimethylammonio )propionate; 6-(N-dodecylbenzyl-N,N-dimethylammonio)hexanoate; and N,N-dimethyl-N-hexadecylammonio acetate.

Clay soil removal performance results for combinations of the ethoxylated zwitterionic compounds of the present invention with other zwitterionic surfactants are shown in Table 11. Experimental Runs 1 and 2 reproduce the Table 1 results at 250 ppm and ppm for the C ethoxylated zwitterionic compound on its own while Runs 3 and 10 provide the same data for the C material.

The data shows that for both C and C ethoxylated zwitterionics, combination with other zwitterionic cosurfactants results in an improvement in performance which is further enhanced by the addition of a builder (sodium tripolyphosphate).

Performance results for the C APS cosurfactant at 125 ppm together with a three-component builder combination are shown in Run 19, while Runs 23 and 24 respectively show the performance of 250 ppm of a single chain length C APS and a C average chain length APS both built with a sodium carbonate-sodium silicate system.

23 It will be seen that the C ethoxylated zwitterionic material on its own at 250 ppm is as good as the C APS material at 125 ppm with 1000 ppm of builder and better than C APS at 250 ppm with 400 ppm of 24 process). Resin acids are suitable such as rosin and those resin acids in tall oil. Napthenic acids are also suitable. Sodium and potassium soaps can be made by direct saponification of the fats and oils or by the neubuilder, on both cotton and polyester fabrics. tralization of the free fatty acids which are prepared in Grease and oil removal data for combinations of the a separate manufacturing process. Particularly useful C and C ethoxylated zwitterionic compounds with are the sodium and potassium salts of the mixtures of zwitterionic cosurfactants are shown in Table V, Runs fatty acids derived from coconut oil and tallow, i.e., 6 and 7 (C and 13 and 14 (C Advantages are sodium or potassium tallow and coconut soap. again apparent for the combinations in removing both Anionic synthetic detergents include water-soluble triglyceride and hydrocarbon stains from polyester salts, particularly the alkali metal salts, of organic sulfufabrics although the results for polycotton are more ric reaction products having in their molecular strucvariable. ture an alkyl group containing from about 8 to about 22 TABLE II CLAY SOIL REMOVAL OF ETI-IOXYLATED ZWI'ITERIONIC COMPOUNDS IN COMBINATION WITH ZWITIERIONIC SURFACTANTS Conditions: l0 Minute Tergotometer Wash in 7 grains/gal. Mineral Hardness (2:1 CazMg) at 105F Cosurfactants were 3-(N-alkyl N,N-dimethyl ammonio)propane-l-sulphonate(APS) and 3-(N-alkyl N,N-dimethyl ammonio)-2-hydroxy propane- I -sulphonate( HAPS) RELATIVE ETHOXYLATED LEVEL LEVEL LEVEL CLAY REMOVAL INDEX ZWI'ITERIONIC PPM IN PPM IN BUILDER PPM IN POLY- POLY- NO. COMPOUND SOLUTION COSURFACT- SOLUTION TYPE SOLUTION CO'I'ION COTTON ESTER ANT 1 NC I-I N,NbisCH (C H O) CI-I CH SO;, 250 53 69 46 2 125 41 52 24 3 125 C APS 125 79 84 4 I25 125 STP 250 94 I02 I01 5 125 C APS I25 77 91 89 6 I25 I25 STP 250 96 I05 I03 7 125 C HAPS I25 81 77 8 125 I25 STP 250 I12 101 107 9 N-C I-I N,NbisCII,-,

(C,H O) CH CH SO 250 75 96 I0 I25 62 88 77 I I 125 C APS 125 84 84 90 I2 I25 I25 STP 250 114 13 I25 C APS I25 92 88 94 14 I25 I25 STP 250 I10 99 104 I5 I25 C HAPS I25 86 90 80 16 125 STP 250 I06 97 103 I7 NC I-I N,NbisCH (C,H O) CH CH SO I25 C APS I25 Alumino- I08 I04 silicate* 600 Na CO 200 Na SiO 200 I8 63 63 600 94 I06 200 200 20 I25 I25 Na CO 200 86 I06 wa siow 200 21 25 225 200 81 94 200 23 0 250/pure 200 65 87 SI 200 24 0 250/avge 200 70 84 The Aluminosilicate builder used had the formula Na ,[(AlO,) (SiO,) 27I-I,O

"SiO, Na,0 ratio= 3.2:1

ANIONIC DETERGENTS This class of detergents includes ordinary alkali metal soaps such as the sodium, potassium, ammonium and alkylolamminium salts of higher fatty acids containing from about eight to about 24 carbon atoms and preferably from about 10 to about 20 carbon atoms. Suitable fatty acids can be obtained from natural sources such as, for instance, from plant or animal esters (e.g., palm oil, coconut oil, babassu oil, soybean oil, caster oil, tallow, whale and fish oils, grease, lard, and mixtures thereof). The fatty acids also can be synthetically prepared (e.g., by the oxidation of petroleum, or by hydrogenation of carbon monoxide by the Fischer-Tropsch carbon atoms and a moiety selected from the group consisting of sulfonic acid and sulfuric acid ester moieties. (Included in the term alkyl is the alkyl portion of higher acyl moieties.) Examples of this group of synthetic detergents are the sodium and potassium alkyl sulfates, especially those obtained by sulfating the higher alcohols (C -C carbon atoms) produced by reducing the glycerides of tallow or coconut oil; sodium and potassium alkyl benzene sulfonates, in which the alkyl group contains from about 9 to about 20 carbon atoms in straight-chain or branched-chain configuration, e.g. those of the type described in US. Pat. Nos. 2,220,099 and 2,477,383 (especially valuable are linear straight chain alkyl benzene sulfonates in which the 25 average of the alkyl groups is about 11.8 carbon atoms and commonly abbreviated as C LAS); sodium alkyl glyceryl ether sulfonates, especially those ethers of higher alcohols derived from tallow and coconut oil; sodium coconut oil fatty acid monoglyceride sulfonates and sulfates.

Anionic phosphate surfactants are also useful in the present invention. These are surface active materials having substantial detergent capability in which the anionic solubilizing group connecting hydrophobic moieties is an oxy acid of phosphorus. The more common solubilizing groups, of course, are SO H and SO H. Alkyl phosphate esters such as (R-O PO H and ROPO H in which R represents an alkyl chain containing from about 8 to about 20 carbon atoms are useful herein.

These phosphate esters can be modified by including in the molecule from one to about 40 alkylene oxide units, e.g., ethylene oxide units. Formulae for these niodified phosphate anionic detergents are in which R represents an alkyl group containing from about 8 to 20 carbon atoms, or an alkylphenyl group in which the alkyl group contains from about 8 to 20 carbon atoms, and M represents a soluble cation such as hydrogen, sodium, potassium, ammonium or substituted ammonium; and in which n is an integer from 1 to about 40.

Another class of suitable anionic organic detergents particularly useful in this invention includes salts of 2-acyloxyalkane-l-sulfonic acids exemplified by the reaction product of fatty acids esterified with isethionic acid and neutralized with sodium hydroxide where, for example, the fatty acids are derived from coconut oil. These salts have the formula where R is alkyl of about 9 to about 23 carbon atoms (forming with the two carbon atoms an alkane group); R is alkyl of 1 to about 8 carbon atoms; and M is a water-soluble cation.

The water-soluble cation, M, in the hereinbefore described structural formula can be, for example, an alkali metal cation (e.g., sodium, potassium, lithium), ammonium or substituted-ammonium cation. Specific examples of substituted ammonium cations include methyl-, dimethyl-, and trim'ethylammonium cations and quaternary ammonium cations such as tetramethyl-ammonium and dimethyl piperidinium cations and those derived from alkylamines such as ethylamine, diethylamine, triethylamine, mixtures thereof, and the like.

Specific examples of beta-acyloxy-alkane-l-sulfonates, or alternatively 2-acyloxy-alkane-l-sulfonates, useful herein include the sodium salt of 2-acetoxy-tridecane-l-sulfonic acid; the potassium salt of 2-propionyloxy-tetradecane-l-sulfonic acid; the lithium salt of 2-butanoyloxy-tetradecane-l-sulfonic acid; the sodium salt of 2-pentanoyloxy-pentadecane-l-sulfonic acid; the sodium salt of Z-acetoxy-hexadecane-l-sulfonic acid; the potassium salt of 2-octanoyloxy-tetradecane-l-sulfonic acid; the sodium salt of 2-acetoxyheptadecane-l-sulfonic acid; the lithium salt of 2- acetoxy-octadecane-l-sulfonic acid; the potassium salt of 2-acetoxy-nonadecane-l-sulfonic acid; the sodium salt of 2-acetoxy-uncosane-l-sulfonic acid; the sodium salt of 2-propionyloxy-docosane-l-sulfonic acid; the isomers thereof.

Preferred beta-acyloxy-alkane-l-sulfonate salts herein are the alkali metal salts of beta-acetoxy-alkanel-sulfonic acids corresponding to the above formula wherein R is an alkyl of about 12 to about 16 carbon atoms, these salts being preferred from the standpoints of their excellent cleaning properties and ready availability.

Typical examples of the above described betaacetoxy alkanesulfonates are described in the literature: Belgium Pat. No. 650,323 issued July 9, 1963, discloses the preparation of certain Z-acyloxy alkanesulfonic acids. Similarly, US. Pat. Nos. 2,094,451 issued Sept. 28, 1937, to Guenther et al. and 2,086,215 issued July '6, 1937 to DeGroote disclose certain salts of beta-acetoxy alkanesulfonic acids. These references are hereby incorporated by reference.

Another preferred class of anionic detergent compounds herein, both by virtue of superior cleaning properties and low sensitivity to water hardness (Ca-H- and Mg-H- ions) are the alkylated a-sulfocarboxylates, containing about 10 to about 23 carbon atoms, and having the formula:

wherein R is C to C alkyl, M is a water-soluble cation as hereinbefore disclosed, preferably sodium ion, and R' is either short chain length alkyl, e.g., methyl, ethyl, propyl, and butyl or medium chain length alkyl, e.g., hexyl, heptyl, octyl, and nonyl. In the latter case, i.e. the medium chain length esters, the total number of carbon atoms should ideally be in the range 18-20 for optimum performance. These compounds are prepared by the esterification of a-sulfonated carboxylic acids, which are commercially available, using standard techniques. Specific examples of the alkylated a-sulfocarboxylates preferred for use herein include:

a. Short chain length esters ammonium methyl-a-sulfopalmitate,

triethanolammonium ethyl-a-sulfostearate,

sodium methyl-a-sulfopalmitate,

sodium ethyl-a-sulfopalmitate,

sodium butyl-a-sulfostearate,

potassium methyl-a-sulfolaurate,

lithium methyl-a-sulfolaurate, as well as mixtures thereof.

b. Medium chain length esters sodium hexyl-a-sulphomyristate 27 potassium octyl-a-sulpholaurate ammonium methyl-hexyl-a-sulpholaurate and mixtures thereof.

A preferred class of anionic organic detergents are the ,B-alkyloxy alkane sulfonates. These compounds have the following formula:

where R is a straight chain alkyl group having from 6 to 20 carbon atoms, R is a lower alkyl group having from 1 (preferred) to 3 carbon atoms, and M is a watersoluble cation as hereinbefore described.

Specific examples of ,B-alkyloxy alkane sulfonates, or alternatively 2-alkyloxy-alkane-l-sulfonates, having low hardness (calcium ion) sensitivity useful herein to provide superior cleaning levels under household washing conditions include:

potassium-B-methoxydecanesulfonate,

sodium 2-methoxytridecanesulfonate,

potassium 2-ethoxytetradecylsulfonate,

sodium 2-isopropoxyhexadecylsulfonate,

lithium 2-t-butoxytetradecylsulfonate,

sodium ,B-methoxyoctadecylsulfonate, and

ammonium ,B-n-propoxydodecylsulfonate.

Another suitable class of anionic surfactants are the water-soluble salts of the organic, sulfuric acid reaction products of the general formula wherein R is chosen from the group consisting of a straight or branched chain, saturated aliphatic hydrocarbon radical having from 8 to 24, preferably 12 to 18, carbon atoms; and M is a cation. Important examples are the salts of an organic sulfuric acid reaction prodnot of a hydrocarbon of the methane series, including iso-, neo-, meso-, and n-paraffins, having 8 to 24 carbon atoms, preferably 12 to 18 carbon atoms and a sulfonating agent e.g. S H 80 oleum, obtained according to known sulfonation methods, including bleaching and hydrolysis. Preferred are alkali metal and ammonium sulfonated C1248 n-paraffins.

Other synthetic anionic detergents useful herein are alkyl ether sulfates. These materials have the formula RO(C H O) SO M wherein R is alkyl or alkenyl of about to about 20 carbon atoms, x is 1 to 30, and M is a water-soluble cation as defined hereinbefore. The alkyl ether sulfates useful in the present invention are condensation products of ethylene oxide and monohydric alcohols having about 10 to about 20 carbon atoms. Preferably, R has 14 to 18 carbon atoms. The alcohols can be derived from fats, e.g., coconut oil or tallow, or can be synthetic. Lauryl alcohol and straight chain alcohols derived from tallow are preferred herein. Such alcohols are reacted with 1 to 30, and especially 6, molar proportions of ethylene oxide and the resulting mixture of molecular species, having, for example, an average of 6 moles of ethylene oxide per mole of alcohol, is sulfated and neutralized.

Specific examples of alkyl ether sulfates of the present invention are sodium coconut alkyl triethylene glycol ether sulfate; lithium tallow alkyl triethylene glycol ether sulfate; and sodium tallow alky hexaoxyethylene sulfate. Highly preferred alkyl ether sulphates are those comprising a mixture of individual compounds, said mixture having an average alkyl chain length of from about 12 to 16 carbon atoms and an average degree of ethoxylation of from about 1 to 4 moles of ethylene oxide. Such a mixture also comprises from about 0 to 20% by weight C1243 compounds; from 60 to 100% by weight of CIMHG compounds; from about 0 to 20% by weight of C compounds; from about 3 to 30% by weight of compounds having a degree of ethoxylation of 0; from about 45 to by weight of compounds having a degree of ethoxylation of from 1 to 4; from about 10 to 25% by weight of compounds having a degree of ethoxylation of from 4 to 8; and from about 0.1 to 15% by weight of compounds having a degree of ethoxylation greater than 8.

Additional examples of anionic synthetic detergents which come within the terms of the present invention are the reaction product of fatty acids esterified with isethionic acid and neutralized with sodium hydroxide where, for example, the fatty acids are derived from coconut oil; sodium or potassium salts of fatty acid amides of methyl tauride in which the fatty acids, for example, are derived from coconut oil. Other anionic synthetic detergents of this variety are set forth in U.S. Pat. Nos. 2,486,921; 2,486,922; and 2,396,278.

Additional examples of anionic synthetic detergents, which come within the terms of the present invention, are the compounds which contain two anionic functional groups. These are referred to as di-anionic detergents. Suitable dianionic detergents are the disulfonates, disulfates, or mixtures thereof which may be represented by the following formulae:

a)z 4) 6 3) 0 where R is an acyclic aliphatic hydrocarbyl group having 15 to 20 carbon atoms and M is a water-solubilizing cation, for example, the C to C disodium 1,2-alkyldisulfates, C to C dipotassium-l ,2-alkyldisulfonates or disulfates, disodium 1,9-hexadecyl disulfates, C to C disodium-1,2-alkyldisulfonates, disodium 1,9- stearyldisulfates and 6,10-octadecyldisulfates.

The aliphatic portion of the disulfates or disulfonates is generally substantially linear, thereby imparting desirable biodegradable properties to the detergent compound.

The water-solubilizing cations include the customary cations known in the detergent art, i.e., the alkali metals, and the ammonium cations, as well as other metals in group 11A, 11B, IIIA, IVA and IVB of the Periodic Table except for boron. The preferred water-solubilizing cations are sodium or potassium. These dianionic detergents are more fully described in British Pat. No. 1,151,392 which is hereby incorporated by reference.

Still other anionic synthetic detergents include the class designated as succinamates. This class includes such surface active agents as disodium N-octadecylsulfosuccinamate; tetrasodium N-(1,2-dicarboxyethyl)-N- octadecylsulfo-succinamate; diamyl ester of sodium sulfosuccinic acid; dihexyl ester of sodium sulfosuccinic acid; dioctyl esters of sodium sulfosuccinic acid.

Other suitable anionic detergents utilizable herein are olefin sulfonates having about 12 to about 24 carbon atoms. The term olefin sulfonates is used herein to mean compounds which can be produced by the sulfonation of a-olefins by means of uncomplexed sulfur trioxide, followed by neutralization of the acid reaction mixture in conditions such that any sultones which have been formed in the reaction are hydrolyzed to give the corresponding hydroxy-alkanesulfonates. The sulfur trioxide can be liquid or gaseous, and is usually,

29 but not necessarily, diluted by inert diluents, for example by liquid S chlorinated hydrocarbons, etc., when used in the liquid form, or by air, nitrogen, gaseous S0 etc., when used in the gaseous form.

The a-olefins from which the olefin sulfonates are derived are mono-olefins having 12 to 24 carbon atoms, preferably 14 to 16 carbon atoms. Preferably, they are straight chain olefins. Examples of suitable l-olefins include l-dodecene; l-tetradecene; l-hexadecene; l-octadecene; l-eicosene and l-tetracosene.

In addition to the true alkene sulfonates and a proportion of hydroxy-alkanesulfonates, the olefin sulfonates can contain minor amounts of other materials, such as alkene disulfonates depending upon the reaction conditions, proportion of reactants, the nature of the starting olefins and impurities in the olefin stock and side reactions during the sulfonation process.

A specific a-olefin sulfonate mixture of the above type is described more fully in the US. Pat. No. 3,332,880 of Phillip F. Pflaumer and Adrian Kessler, issued July 25, 1967, titled Detergent Composition, the disclosure of which is incorporated herein by reference.

In Table II A-D clay soil removal results are given for combinations of ethoxylated zwitterionic compounds and anionic surfactants. Experimental Runs 1, 2, 33, and 34 represent comparative results for the C and C ethoxylated zwitterionic compounds respectively at levels of 250 and 125 ppm. Experimental Runs 3-14 inclusive also give comparative results for various anionic surfactants and, with the exception of the alkyl ether sulphate, these materials all show very poor clay soil removal when used alone in water.

Runs 35-40 inclusive demonstrate the effect of various anionic cosurfactants on the performance of the C ethoxylated zwitterionic compound, both with and without builder at a level of 125 ppm each (i.e. a 1:1 ratio) of the C compound and cosurfactant. It can be seen that for ethoxylated zwitterionic compounds having mediocre particulate soil removal performance addition of anionic cosurfactants provides a benefit but that incorporation of builder gives little further improvement.

Runs 15-32 and 41-88 demonstrate the effect of various anionic cosurfactants on the performance of the C ethoxylated zwitterionic compound in the presence and absence of builder. Runs 15-32 show that, at 125 ppm each of C compound and anionic cosurfactant in the absence of builder, particulate soil removal performance of the ethoxylated zwitterionic compound is depressed. It is restored, in varying degrees, by either delaying the solution of the anionic cosurfactant (Runs l6, 19, 22, 25, 28, and 31) which produces a marked effect on the performance on polyester fabrics, or by Runs 41-58 duplicate Runs 15-32 except that the level of C ethoxylated zwitterionic compound is at 250 ppm in solution, i.e. a ratio of C compound to anionic cosurfactant of 2:1. It can be seen that the depressive effect of the anionic surfactant is less evident, particularly for the composition containing sodium stearate. Furthermore, the effect of either delaying cosurfactant solution, or of adding builder, is to appreciably improve performance and in certain specific instances, to equal the performance attained by 250 ppm C ethoxylated zwitterionic compound on its own.

Runs 59-88 provide further evidence of the extent to which anionic surfactants inhibit the particulate soil removal performance of the ethoxylated zwitterionic compounds of the present invention. A reduction in performance is still apparent at a ratio of ethoxylated zwitterionic to anionic cosurfactant of 4:1, the exception again being sodium stearate, but is much less noticeable at a ratio of 9:1, the addition of builder providing a benefit in each instance. At an ethoxylated zwitterionic compound level of 300 ppm in solution and with 25 ppm cosurfactant (12:1 ratio) substantially no diminution in particulate soil removal performance is seen.

As noted above, the results show the sequential dissolution of first the ethoxylated zwitterionic and then the anionic cosurfactant serves to minimize the adverse effect of the latter on the clay removal performance of the former. Such sequential dissolution can be achieved by any one of a number of known methods, e.g., by coating, granulation, or agglomeration of the anionic with other conventional detergent components such as C fatty acids, c1248 fatty acid amides and alkanol amides, high molecular weight (i.e. MWt 1000) polyethylene glycols, hydratable inorganic builder salts such as alkali metal polyphosphates, and porous siliceous materials such as those sold under the Trade Name Zeosyl by J. M. Huber Corporation. Conveniently, the diluent component is incorporated at a level of 5 to 50%, preferably 10 to 25%, by weight of the mixture of anionic surfactant plus diluent so as to effect a delay of at least 60 seconds in the complete dissolution or dispersion of the mixture in an aqueous medium at F.

Similarly, microencapsulation using, e.g., hydrolysed gelatin, agar, or polyvinyl alcohol wall materials can be employed where low levels of anionic material are desired. Techniques for microen'capsulating materials, including detergent components, are well known in the art. A typical disclosure of such techniques is given in Kirk-Othmer Encyclopedia of Chemical Technology, 2nd edition, 13, pp. 436-456, published in 1967 by John Wiley & Sons, Inc. This disclosure is incorporated adding builder to the system, which shows a benefit for 55 herein by reference.

the more hydrophilic cotton-containing fabrics.

TABLE IIIA CLAY SOIL REMOVAL OF ETI-IOXYLATED ZWITTERIONIC COMPOUNDS IN COMBINATION WITH ANIONIC SURFACT ANTS Conditions: 10 Minute Tergotometer Wash at F in 5.5 grains/gal. Mineral Hardness (CazMg 3:1)

ETHOXYLATED ZWITTERIONIC LEVEL PPM IN RELATIVE LEVEL LEVEL CLAY REMOVAL INDEX PPM IN BUILD- PPM IN POLY- POLY- ER SOLUTION TYPE No. COMPOUND SOLUTION COSURFACTANT SOLUTION COTTON COTTON ESTER l NC H;, N,NbisCH (C H O) CH CH SO, 250 90 92 95 69 88 93 TABLE IIIA-continued CLAY SOIL REMOVAL OF ETHOXYLATED ZWITTERIONIC COMPOUNDS IN COMBINATION WITH ANIONIC SURFACTANTS Conditions: Minute Tergotometer Wash at 105F in 5.5 grains/gal. Mineral Hardness (CazMg 3:1)

RELATIVE ETHOXYLATED LEVEL LEVEL LEVEL CLAY REMOVAL INDEX ZWITTERIONIC PPM IN PPM IN BUILD- PPM IN POLY- POLY- ER No. COMPOUND SOLUTION COSURFACTANT SOLUTION TYPE SOLUTION COTTON COTTON ESTER 3 c No 125 23 64 4 250 41 69 21 5 C aIkyI 125 32 32 27 OSO Na 6 250 36 33 31 7 C -C aIkyI 125 71 71 45 (EO) OSO;,Na 8 250 84 79 51 9 Na stearatc 125 3O 4O 10 250 30 43 34 I l C C alkane 125 60 63 46 SO Na 12 250 64 63 46 13 Na Hexyl a-suIpho 125 34 Laurate 14 250 35 32 15 NC ,H N,NbisCI*1 125 c 125 39 s1 34 (cg-1 01 011 01150 16 125 125* 64 71 78 17 125 125 STP 250 52 79 35 18 125 C C aIkyI 125 38 60 3O OSO Na 19 125 125* 61 67 77 20 125 125 STP 250 48 74 36 21 125 c -c -a1ky1 12s 3s 3| (EO) OSO Na 22 125 125* 66 65 72 23 125 125 STP 250 52 78 37 24 125 Na stearate 125 43 85 72 25 125 125* 77 78 93 26 125 125 STP 250 61 96 89 27 125 c C aIkane 125 53 68 37 Sc m 28 125 125* 69 83 78 29 1 125 125 STP 250 55 69 37 3O 125 Na I-Icxyl a-suIpho 125 53 68 34 Laurate 31 125 125* 55 78 78 32 125 125 STP 250 55 73 40 Introduced 2 minutes after ethoxylated zwitterionic compound contacted with fabrics.

TABLE IIIB CLAY SOIL REMOVAL OF ETHOXYLATED ZWI'TTERIONIC COMPOUNDS IN COMBINATION WITH ANIONIC SURFACT ANTS Conditions: 10 Minute Tergotometer Wash in 7 grains/gal. Mineral Hardness (2:1 CazMg) at 105F RELATIVE ETHOXYLATED LEVEL LEVEL LEVEL CLAY REMOVAL INDEX ZWITTERIONIC PPM IN PPM IN BUILD- PPM IN POLY- POLY- ER NO. COMPOUND SOLUTION COSURFACTANT SOLUTION TYPE SOLUTION COTTON COTTON ESTER 33 N-C H N,N--bisCI-I 250 53 69 46 (C,H O) CH,CI-1 SO 34 125 41 52 24 C 1L2 @SO3 Na 36 125 125 STP 250 68 73 37 37 125 C alkyl 125 65 34 (EO) OSO Na 38 125 125 STP 250 77 40 39 125 Na stcarate 125 44 57 31 40 125 125 STP 250 72 62 24 TABLE IIIC CLAY SOIL REMOVAL OF ETHOXYLATED ZWI'I'TERIONIC COMPOUNDS IN COMBINATION WITH ANIONIC SURFACT ANTS Conditions: 10 Minute Tergotometer Wash at F in 5.5 grains/gal. Mineral Hardness (CazMg 3:1)

RELATIVE ETHOXYLATED LEVEL LEVEL LEVEL CLAY REMOVAL INDEX ZWI'I'I'ERIONIC PPM IN PPM IN BUILD- PPM IN POLY- POLY- ER NO. COMPOUND SOLUTION COSURFACTANT SOLUTION TYPE SOLUTION COTTON COTTON ESTER 41 NC 1-1 N,N--bisCI-1; 250 c NO 68 53 37 (C,H O),C1-I,CH,SO 11.8 3

TABLE IIIC Continued CLAY SOIL REMOVAL OF ETHOXYLATED ZWI'I'IERIONIC COMPOUNDS IN COMBINATION WITH ANIONIC SURFACTANTS Conditions: 10 Minute Tergotometer Wash at 105F in 55 grains/gal. Mineral Hardness (CazMg 3:1)

RELATIVE ETHOXYLATED LEVEL LEVEL LEVEL CLAY REMOVAL INDEX ZWI'I'IERIONIC PPM IN PPM IN BUILD- PPM IN POLY- POLY- ER No. COMPOUND SOLUTION COSURFACTANT SOLUTION TYPE SOLUTION COTTON COTTON ESTER 42 250 125* 89 82 I 43 250 125 STP 250 63 68 47 44 250 C ;C alkyl 125 60 67 31 OSO Na 250 125* 75 82 91 46 250 125 STP 250 77 74 42 47 250 C -C alkyl I 68 42 (EO) OSO;,Na 48 250 125* 113 83 62 49 250 125 STP 250 46 79 61 50 250 Na stearate 125 84 92 95 51 250 125* 95 92 96 52 250 I25 STP 250 105 103 99 53 250 C -C alkane 125 62 69 34 SO Na 54 250 125 95 92 96 55 250 "I25 STP 250 55 31 87 56 250 Na Hexyl a-sulpho I25 67 73 36 Laurate 57 250 125* 75 89 89 58 250 125 STP 63 78 35 Introduced 2 minutes after ethoxylated zwitterionic compound contacted with fabrics.

TABLE IllD CLAY SOIL REMOVAL OF ETI-IOXYLATED ZWITTERIONIC COMPOUNDS IN COMBINATIN WITH ANIONIC SURFACTANTS Conditions: 10 Minute Tergotometer Wash at 105F in 5.5 grains/gal. Mineral Hardness (CazMg 3:1)

RELATIVE ETHOXYLATED LEVEL LEVEL LEVEL CLAY REMOVAL INDEX SWI'I'TERIONIC PPM IN PPM IN BUILD- PPM IN POLY- POLY- ER NO. COMPOUND SOLUTION COSURFACTANT SOLUTION TYPE SOLUTION COTTON COTTON ESTER 59 NC, H N,NbisCH= (CH CH O),,CH,Cl-I SO 200 C H 50 44 79 36 60 200 5O STP 250 71 6O 62 61 225 25 52 82 59 62 225 25 STP 250 93 97 96 63 300 25 91 90 96 64 200 C -Q alkyl 50 54 68 32 OSO Na 65 200 50 STP 250 59 71 34 66 225 25 81 64 2g 225 25 STP 250 86 94 92 300 25 88 88 96 69 200 C -C alkyl 50 59 72 39 (EO) OSO -,Na 70 200 50 STP 250 63 67 42 71 225 25 71 83 73 72 225 25 STP 250 82 88 96 3 300 25 88 g3 95 74 NC l-1 N,NbisCH (CH,CH,O) CH CH SO;, 200 Na stearate 50 89 87 91 75 200 50 STP 250 92 99 99 76 225 25 94 89 93 z; 225 I 25 STP 250 101 100 101 300 25 88 9O 96 79 200 C C alkane 50 70 72 36 SO a 80 200 50 STP 250 71 63 42 81 225 2S 75 76 45 2g 225 25 STP 250 84 78 73 300 25 93 83 96 84 200 Na Hixyl a-sulpho S0 5O 71 42 aurate 85 200 50 STP 250 50 79 41 86 225 25 61 82 74 87 225 25 STP 250 70 94 79 88 300 25 70 90 91 uct. In contrast, the ethoxylated sulphate surfactant Grease and oil removal data are shown in Table V for serves to inhibit grease and oil removal. combinations of C LAS and C1648 alkyl E S respec- 65 The effect of anionic cosurfactants on the sudsing tively with both C and C ethoxylated zwitterionic characteristics of the ethoxylated zwitterionic comcompounds, and it can be seen that C LAS provides pounds of the present invention is illustrated in the performance advantages relative to the control prod- Figure in which the suds heights developed by the Re- 36 circulating Suds Generator (R86) are plotted for different blends of C ethoxylated zwitterionic compound 2 and sodium C linear alkyl benzene sulphonate over a T IO-minute time interval. It can be seen that an apprev ciable fraction of the sudsing performance achieved by 5 (C 2 2 )m 100% C118 LAS is given by blends in which the level of A as low the sudsing performance where R R and X are as previously defined and "lcreasmgwlfll mereasmg Cl1-8 level' wherein the sum of m+n has a value in the range 350 Thus amome f i can be mCOFPOrated m can also be combined satisfactorily with the ethoxyll l eempesmens m aeeerdanee wlth the present 10 ated zwitterionics useful in' the present invention. Commventlon although they should eifeeed 50% by pounds of the above type are available under the trade weight of the ethoxylated zwltterlonrc-cosurfactant name Ethoquad from the Armour Chemical mixture if the desirable particulate soil removal properpany ties of the ethoxylated zwitterionic compound are to be The effect of cationic cosurfactants on the clay so retained. Alkali metal salts of aliphatic carboxylic acids removal performance of ethoxylated zwitterionic Fan ble ncorporated .at these levels without special ounds of the present invention is shown in Table IV. It lormu atlon precautions but most anionic cosurfactant can clearly be Seen that the C16 trimethyl quaternary evels in excess of 20% of the mixture, more preferably has an adverse effect on clay Soil removal which is l excess of 10% the mlxmre requlre meorporetfon mitigated by the addition of a builder whereas the C in a manner that Wlll delay the cosurfactant solubility. 2O ethoxylated quaternary cosurfactam enhances perfor CATIONXC DETERGENTS mance. This effect can be seen for both the C and C O l h ethoxylated zwitterionic compounds and characterizes n t e eat'ome detergents havmg a hydroph'he a general tendency for quaternary cosurfactants having P %l the molecule have e e to be hydrophilic structural components to have beneficial i h ethxlated ,Zwltteneme effects on the particulate soil removal performance of 8 use u m t e present mvemlen the ethoxylated zwitterionic compounds while for quaus compounds of the class ternary cosurfactants not having hydrophilic structural components, the reverse effect is seen.

TABLE IV CLAY SOIL REMOVAL OF ETHOXYLATED ZWITTERIONIC COMPOUNDS IN COMBINATION WITH CATIONIC SURFACT ANTS Conditions: l0 Minute Tergotometer Wash in 7 grains/gal. Mineral Hardness (2:1 CazMg) at 105F RELATIVE ETHOXYLATED LEVEL LEVEL LEVEL CLAY REMOVAL INDEX ZWI'I'IERIONIC PPM IN PPM IN BUILD- PPM IN POLY- POLY- ER NO. COMPOUND SOLUTION COSURFACTANT SOLUTION TYPE SOLUTION COTTON COTTON ESTER 1 N-C H N,NbisCI-I (CH,CH O) CH CH SO 250 75 96 95 2 125 68 88 77 3 125 [C HMC Q 125 26 63 28 N Br 4 125 125 STP 250 90 84 61 S 125 C alkyl di- 125 88 93 96 polyethenoxy Ammonium Bromide* 6 125 125 STP 250 98 I08 104 7 N--C H N,N-bisCII 250 53 69 46 (CH CH O) CH CH,SO 8 125 41 52 24 9 125 [C ,H (CH 125 15 46 13 N Br 10 125 12S STP 250 46 26 11 125 C alkyl di- 125 71 82 61 polyethenonxy Ammonium Bromide l2 125 125 STP 250 71 89 Total No. of ethylene oxide groups per mole 50.

OPTIONAL COMPONENTS In addition to the ethoxylated zwitterionic compound and the organic surfactant, the detergent compositions a 60 may also contain other ingredients conventionally employed in such products. The principal optional compocan be employed where R is a C -C linear or nent is an inorganic or organic detergent builder to branched alkyl or alkenyl group R and R are C -C assist in mineral hardness control which may be used at alkyl or hydroxy alkyl groups, p has a value in the range levels between 1 and 99% by weight of the detergent 3-50, and X is a compatible anion such as chloride, 65 composition, preferably between 10 and and most bromide, iodide, sulphate, methosulphate acetate or preferably between 25 and 60%. phosphate. Suitable inorganic builders include the alkali metal Similarly, compounds having the structure polyphosphates (including the pyrophosphates and

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Classifications
U.S. Classification510/349, 510/341, 510/352, 510/340, 510/494, 510/355, 987/110, 510/350, 510/441, 510/351
International ClassificationC07F9/54, C11D1/94, C11D3/36, C11D1/88, C07F9/00
Cooperative ClassificationC11D1/886, C11D3/361, C11D1/94, C07F9/54, C11D1/88
European ClassificationC11D1/94, C07F9/54, C11D1/88C, C11D3/36B, C11D1/88