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Publication numberUS2833736 A
Publication typeGrant
Publication dateMay 6, 1958
Filing dateJul 20, 1953
Priority dateJul 20, 1953
Publication numberUS 2833736 A, US 2833736A, US-A-2833736, US2833736 A, US2833736A
InventorsGlaser Harry W
Original AssigneeWestern Union Telegraph Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Aqueous graphite-polyvinyl alcohol ink composition
US 2833736 A
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Description  (OCR text may contain errors)

United States Patent AQUEOUS GRAPHITE-POLYVINYL ALCOHOL INK COMPOSITION Harry W. Glaser, Middle Village, N. Y., assignor to The Western Union Telegraph Company, New York, N. Y., a corporation of New York No Drawing. Application July 20, 1953 Serial No. 369,231

2 Claims. 01. 260-296) This invention relates to ink and more particularly to a new composition of ink that has characteristics especially uesful for certain drafting purposes.

in making paper tracings and other short term records, it is customary to use pencil because pencil lines are erasable and conveniently and quickly made. However, pencil work is subject to certain disadvantages. Prints and other reproductions of pencil tracings are poor in that the lines are light. Also, a pencil compass produces a light line which must be gone over a number of times to obtain a line' of suflicient weight. This process tends to emboss the paper so that if the line must be erased, an impression nevertheless remains. A further disadvantage of pencil work is the susceptibility to smudging. These problems may of course be overcome by employing India ink, but this presents the disadvantage of not being readily erasable.

It is therefore a principal object of this invention to provide an improved drafting ink.

Another object of the invention is to provide an ink that will not smudge and is also readily erasable.

A further object of this invention is to provide an ink that will produce lines from which clear and well defined prints can be made.

These and other objects and advantages will become apparent from the following description.

In accordance with the above objects, the ink of the present invention contemplates an aqueous solution ineluding graphite particles of a size of 2 to -5 microns. It is found that when this graphite ink is applied to a writing surface, the graphite particles, due to their flake structure and size, are prevented from penetrating the surface. Since the particles lay on the surface, the lines or other marks may be easily erased. This characteristic is in contradistinction to carbon black which is normally found in drafting inks. The carbon particles being of a much smaller size and not possessing a flake structure tend to flow into the interstices of the paper fibers to a depth that makes erasing extremely difiicult in most cases.

A preferred binder is polyvinyl alcohol commercially available from E. I. du Pont de Nemours & Co. under the trade name Elvanol, and a particularly suitable grade is their Elvanol 50-42. It is found that a dilute water solution wherein the surface tension is within the range of 40 to 65 dynes per cm. provides an ink with a wetting quality permitting proper flow while preventing undue spreading.

f0 CC The preferred formula for the ink of the present invention is as follows:

Experiments have shown that each of the above quantitles may be varied 20% plus or minus without losing any of the desirable characteristics previously set forth.

Through polyvinyl alcohol yields highly satisfactory results, other water soluble binders may be used in the alternative. For example, methyl cellulose, carboxymethyl cellulose, casein, glue, :gum arabic, starch, or shellac solubilized by an alkali such as borax or ammonia are equally well suited as binding materials. When employing one of the alternative binders, the concentration should be very dilute, as in the preferred example, as to come within the range of surface tension hereinabove set forth. If the surface tension happens to fall outside of the desired range it may be adjusted by addition of suitable surface active materials in minute amounts in manner well known in the art. The weak concentration of binder solution in combination with the graphite particles gives the ink the erasable characteristics of pencil.

While the ink of the present invention has been described as particularly adapted for certain drafting purposes, it is readily seen that it is well suited for any purposes where an easily erasable non-smudging ink is desirable.

What is claimed is:

1. A drawing ink comprising graphite particles within the size range of 2 to 5 microns and as a binder therefor a solution of polyvinyl alcohol in water, said ink having the following proportions: 8 to 12 grams graphite, .2 to .3 gram polyvinyl alcohol and 160 to 240 grams water.

2. A drawing ink having the erasable characteristics of pencil comprising graphite particles of a size of 2 to 5 microns and as a binder therefor a polyvinyl alcohol water solution having a surface tension within the range of 40 to dynes per cm., said ink having substantially the following proportions: 10 grams graphite, .25 gram polyvinyl alcohol and 200 grams of water.

References Cited in the file of this patent UNITED STATES PATENTS 1,364,406 Olsen Jan. 4,- 1921 2,357,927 Berg Sept. 12, 1944 2,542,304 Boucher et a1. Feb. 20, 1951 2,556,902 Chambers et al. June 12, 1951 FOREIGN PATENTS 262 Great Britain of 1873 OTHER REFERENCES Healey, Paint Manufacture. March 1943, 3, pages 48-52.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1364406 *Apr 24, 1920Jan 4, 1921Chester Novelty Company IncInk-stick
US2357927 *Jul 24, 1940Sep 12, 1944Raymond Berg JamesEmulsion printing ink
US2542304 *Dec 29, 1950Feb 20, 1951Cormack E BoucherRadiographic sheet
US2556902 *Apr 16, 1949Jun 12, 1951Dick Co AbStencil duplicating inks
GB187300262A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3111497 *Aug 12, 1960Nov 19, 1963Kenner Products CompanyAqueous polyvinyl alcohol coating composition containing aluminum glitter pigment
US4329262 *Mar 25, 1981May 11, 1982Scripto, Inc.Initially erasable ink composition for a ball point writing instrument
US4329264 *Apr 3, 1980May 11, 1982Scripto, Inc.Ballpoint writing instrument containing an initially erasable ink
US5476580 *May 3, 1994Dec 19, 1995Electrochemicals Inc.Processes for preparing a non-conductive substrate for electroplating
US5554739 *Dec 15, 1994Sep 10, 1996Cabot CorporationAttaching organic group to graphite, carbon fibers, etc.
US5559169 *Dec 15, 1994Sep 24, 1996Cabot CorporationEPDM, HNBR and Butyl rubber compositions containing carbon black products
US5571311 *Dec 15, 1994Nov 5, 1996Cabot CorporationInk jet ink formulations containing carbon black products
US5575845 *Dec 15, 1994Nov 19, 1996Cabot CorporationCarbon black products for coloring mineral binders
US5630868 *Dec 14, 1995May 20, 1997Cabot CorporationInk jet ink formulations containing modified carbon products
US5672198 *Dec 14, 1995Sep 30, 1997Cabot CorporationContaining ionizable group
US5690805 *Jun 7, 1995Nov 25, 1997Electrochemicals Inc.Direct metallization process
US5698016 *Jun 14, 1996Dec 16, 1997Cabot CorporationInks, coatings
US5707432 *Jun 14, 1996Jan 13, 1998Cabot CorporationNot readily dispersible in water
US5713988 *Dec 14, 1995Feb 3, 1998Cabot CorporationNon-aqueous inks and coatings containing modified carbon products
US5725807 *Jun 7, 1995Mar 10, 1998Electrochemicals Inc.Carbon containing composition for electroplating
US5747562 *Jun 14, 1996May 5, 1998Cabot CorporationInk and coating compositions containing silicon-treated carbon black
US5749950 *Jan 28, 1997May 12, 1998Cabot CorporationInk and coating compositions containing silicon-treated carbon black
US5803959 *Jan 14, 1997Sep 8, 1998Cabot CorporationModified carbon products and ink jet inks, inks and coatings containing modified carbon products
US5807494 *Dec 15, 1994Sep 15, 1998Boes; Ralph UlrichGel compositions comprising silica and functionalized carbon products
US5851280 *Dec 14, 1995Dec 22, 1998Cabot CorporationReaction of carbon black with diazonium salts, resultant carbon black products and their uses
US5863323 *May 21, 1996Jan 26, 1999Cabot CorporationMineral binders colored with silicon-containing carbon black
US5900029 *Jul 7, 1998May 4, 1999Cabot CorporationReaction of carbon black with diazonium salts, resultant carbon black products and their uses
US5916934 *May 21, 1996Jun 29, 1999Cabot CorporationElastomeric compounds incorporating partially coated carbon blacks
US5919855 *Feb 11, 1997Jul 6, 1999Cabot CorporationSolvent-free; bulk polymerization
US5958999 *Apr 5, 1996Sep 28, 1999Cabot CorporationMixture of colorant and polymer
US6028137 *May 21, 1996Feb 22, 2000Cabot CorporationElastomeric compounds incorporating silicon-treated carbon blacks
US6042643 *Jun 26, 1998Mar 28, 2000Cabot CorporationAs pigment to color plastics, paper, textile, rubber, aqueous inks
US6107350 *Aug 8, 1997Aug 22, 2000Cabot CorporationGel compositions
US6169129May 1, 1998Jan 2, 2001Cabot CorporationInk and coating compositions containing silicon-treated carbon black
US6171468Nov 21, 1997Jan 9, 2001Electrochemicals Inc.Electroconductive carbon coating on nonconductive surface
US6303181Mar 17, 2000Oct 16, 2001Electrochemicals Inc.Providing substrate having non-conductive surface; contacting with conditioning agent comprising cationic substantive conditioner effective to deposit film; contacting with carbon dispersion comprising conductive carbon and binder
US6323273Sep 9, 1999Nov 27, 2001Cabot CorporationElastomeric compounds incorporating silicon-treated carbon blacks
US6436178Dec 20, 2000Aug 20, 2002Cabot CorporationInkjet ink and other ink compositions containing cyclic amides
US6448309Mar 21, 2001Sep 10, 2002Cabot CorporationElastomeric compounds incorporating silicon-treated carbon blacks
US6450632Oct 12, 2000Sep 17, 2002Hewlett-Packard CompanyAqueous solution containing pigments
US6494943Oct 27, 2000Dec 17, 2002Cabot CorporationColored pigments having one or more desired parameters and/or properties are described. these parameters and/or properties include: a) a particles size accusizer number of less than 10, dispersion and filterability
US6494946Feb 25, 1999Dec 17, 2002Cabot CorporationProcesses for preparing a carbon black product having an organic group attached to the carbon black. in one process at least one diazonium salt reacts with a carbon black in the absence of an externally applied electric current sufficient
US6500880Oct 26, 2000Dec 31, 2002Hewlett-Packard ComapnyBlack to color bleed control using specific polymers in ink-jet printing inks containing pigmented inks requiring dispersants
US6506245Oct 27, 2000Jan 14, 2003Cabot CorporationSurface-modified;treating agent; high shearing and introducing at least one diazotizing agent to the mixture such that a reaction product is formed
US6558459Feb 27, 2001May 6, 2003Hewlett-Packard Development CompanyDerivatized with one or more crown ethers to render water-insoluble colorants soluble in water and in water-miscible organic solvents commonly employed in inkjet printing, particularly thermal inkjet printing
US6599353Apr 20, 2001Jul 29, 2003Berol CorporationShear-thinning writing compositions, writing instruments, and methods
US6663704Jul 3, 2001Dec 16, 2003Berol CorporationShear-thinning and/or erasable, and can be used pens and markers pens and markers
US6710259Sep 17, 2001Mar 23, 2004Electrochemicals, Inc.Overcoating nonconductor with carbon; pretreating for electroplating; printed circuits
US6740151May 3, 2002May 25, 2004Cabot CorporationReaction of carbon black with diazonium salts, resultant carbon black products and their uses
US6749676Jul 3, 2001Jun 15, 2004Berol CorporationErasable inks, writing instruments, and methods
US6863713Dec 30, 1999Mar 8, 2005Cabot CorporationMethod to adsorb an adsorbate using modified carbonaceous material
US6986809Jun 14, 2004Jan 17, 2006Berol CorporationErasable inks, writing instruments, and methods
US7186923Dec 5, 2003Mar 6, 2007Electrochemicals, Inc.Printed wiring boards and methods for making them
US7294185Mar 22, 2004Nov 13, 2007Cabot CorporationReaction of carbon black with diazonium salts, resultant carbon black products and their uses
US7544238Sep 29, 2000Jun 9, 2009Cabot CorporationModified pigments having steric and amphiphilic groups
US8034316Nov 6, 2007Oct 11, 2011Cabot Corporationpurity, free of benzo(a)pyrene, polyaromatic hydrocarbons or limited amount; used in elastomers, rubber matrix, or tires; purification from hot tail gas; air pollution control, health
US8710136Aug 12, 2011Apr 29, 2014Cabot CorporationCarbon blacks having low PAH amounts and methods of making same
EP1388576A1Jul 18, 2003Feb 11, 2004Hewlett-Packard CompanyFluid set for ink-jet printers
EP1900766A1Jan 19, 2000Mar 19, 2008Cabot CorporationAggregates having attached polymer groups and polymer foams
EP2316873A1Jan 19, 2000May 4, 2011Cabot CorporationAggregates having attached polymer groups and polymer foams
EP2316874A1Jan 19, 2000May 4, 2011Cabot CorporationAggregates having attached polymer groups and polymer foams
EP2316875A1Jan 19, 2000May 4, 2011Cabot CorporationAggregates having attached polymer groups and polymer foams
WO2001081484A2 *Apr 20, 2001Nov 1, 2001Berol CorpShear-thinning writing compositions, writing instruments, and methods
WO2002002700A2 *Jul 3, 2001Jan 10, 2002Berol CorpErasable inks, writing instruments, and methods
Classifications
U.S. Classification524/557, 106/31.65, 106/415, 106/472, 106/31.64
International ClassificationC09D11/16
Cooperative ClassificationC09D11/16
European ClassificationC09D11/16