|Publication number||US2833736 A|
|Publication date||May 6, 1958|
|Filing date||Jul 20, 1953|
|Priority date||Jul 20, 1953|
|Publication number||US 2833736 A, US 2833736A, US-A-2833736, US2833736 A, US2833736A|
|Inventors||Glaser Harry W|
|Original Assignee||Western Union Telegraph Co|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (5), Referenced by (63), Classifications (8)|
|External Links: USPTO, USPTO Assignment, Espacenet|
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.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US1364406 *||Apr 24, 1920||Jan 4, 1921||Chester Novelty Company Inc||Ink-stick|
|US2357927 *||Jul 24, 1940||Sep 12, 1944||Raymond Berg James||Emulsion printing ink|
|US2542304 *||Dec 29, 1950||Feb 20, 1951||Cormack E Boucher||Radiographic sheet|
|US2556902 *||Apr 16, 1949||Jun 12, 1951||Dick Co Ab||Stencil duplicating inks|
|GB187300262A *||Title not available|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US3111497 *||Aug 12, 1960||Nov 19, 1963||Kenner Products Company||Aqueous polyvinyl alcohol coating composition containing aluminum glitter pigment|
|US4329262 *||Mar 25, 1981||May 11, 1982||Scripto, Inc.||Initially erasable ink composition for a ball point writing instrument|
|US4329264 *||Apr 3, 1980||May 11, 1982||Scripto, Inc.||Ballpoint writing instrument containing an initially erasable ink|
|US5476580 *||May 3, 1994||Dec 19, 1995||Electrochemicals Inc.||Processes for preparing a non-conductive substrate for electroplating|
|US5554739 *||Dec 15, 1994||Sep 10, 1996||Cabot Corporation||Process for preparing carbon materials with diazonium salts and resultant carbon products|
|US5559169 *||Dec 15, 1994||Sep 24, 1996||Cabot Corporation||EPDM, HNBR and Butyl rubber compositions containing carbon black products|
|US5571311 *||Dec 15, 1994||Nov 5, 1996||Cabot Corporation||Ink jet ink formulations containing carbon black products|
|US5575845 *||Dec 15, 1994||Nov 19, 1996||Cabot Corporation||Carbon black products for coloring mineral binders|
|US5630868 *||Dec 14, 1995||May 20, 1997||Cabot Corporation||Ink jet ink formulations containing modified carbon products|
|US5672198 *||Dec 14, 1995||Sep 30, 1997||Cabot Corporation||Aqueous inks and coatings containing modified carbon products|
|US5690805 *||Jun 7, 1995||Nov 25, 1997||Electrochemicals Inc.||Direct metallization process|
|US5698016 *||Jun 14, 1996||Dec 16, 1997||Cabot Corporation||Compositions of modified carbon products and amphiphilic ions and methods of using the same|
|US5707432 *||Jun 14, 1996||Jan 13, 1998||Cabot Corporation||Modified carbon products and inks and coatings containing modified carbon products|
|US5713988 *||Dec 14, 1995||Feb 3, 1998||Cabot Corporation||Non-aqueous inks and coatings containing modified carbon products|
|US5725807 *||Jun 7, 1995||Mar 10, 1998||Electrochemicals Inc.||Carbon containing composition for electroplating|
|US5747562 *||Jun 14, 1996||May 5, 1998||Cabot Corporation||Ink and coating compositions containing silicon-treated carbon black|
|US5749950 *||Jan 28, 1997||May 12, 1998||Cabot Corporation||Ink and coating compositions containing silicon-treated carbon black|
|US5803959 *||Jan 14, 1997||Sep 8, 1998||Cabot Corporation||Modified carbon products and ink jet inks, inks and coatings containing modified carbon products|
|US5807494 *||Dec 15, 1994||Sep 15, 1998||Boes; Ralph Ulrich||Gel compositions comprising silica and functionalized carbon products|
|US5851280 *||Dec 14, 1995||Dec 22, 1998||Cabot Corporation||Reaction of carbon black with diazonium salts, resultant carbon black products and their uses|
|US5863323 *||May 21, 1996||Jan 26, 1999||Cabot Corporation||Mineral binders colored with silicon-containing carbon black|
|US5900029 *||Jul 7, 1998||May 4, 1999||Cabot Corporation||Reaction of carbon black with diazonium salts, resultant carbon black products and their uses|
|US5916934 *||May 21, 1996||Jun 29, 1999||Cabot Corporation||Elastomeric compounds incorporating partially coated carbon blacks|
|US5919855 *||Feb 11, 1997||Jul 6, 1999||Cabot Corporation||Use of modified carbon black in gas-phase polymerizations|
|US5958999 *||Apr 5, 1996||Sep 28, 1999||Cabot Corporation||Ink compositions and method for generating images produced therefrom|
|US6028137 *||May 21, 1996||Feb 22, 2000||Cabot Corporation||Elastomeric compounds incorporating silicon-treated carbon blacks|
|US6042643 *||Jun 26, 1998||Mar 28, 2000||Cabot Corporation||Reaction of carbon black with diazonium salts, resultant carbon black products and their uses|
|US6107350 *||Aug 8, 1997||Aug 22, 2000||Cabot Corporation||Gel compositions|
|US6169129||May 1, 1998||Jan 2, 2001||Cabot Corporation||Ink and coating compositions containing silicon-treated carbon black|
|US6171468||Nov 21, 1997||Jan 9, 2001||Electrochemicals Inc.||Direct metallization process|
|US6303181||Mar 17, 2000||Oct 16, 2001||Electrochemicals Inc.||Direct metallization process employing a cationic conditioner and a binder|
|US6323273||Sep 9, 1999||Nov 27, 2001||Cabot Corporation||Elastomeric compounds incorporating silicon-treated carbon blacks|
|US6436178||Dec 20, 2000||Aug 20, 2002||Cabot Corporation||Inkjet ink and other ink compositions containing cyclic amides|
|US6448309||Mar 21, 2001||Sep 10, 2002||Cabot Corporation||Elastomeric compounds incorporating silicon-treated carbon blacks|
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|US6494943||Oct 27, 2000||Dec 17, 2002||Cabot Corporation||Ink jet inks, inks, and other compositions containing colored pigments|
|US6494946||Feb 25, 1999||Dec 17, 2002||Cabot Corporation||Reaction of carbon black with diazonium salts, resultant carbon black products and their uses|
|US6500880||Oct 26, 2000||Dec 31, 2002||Hewlett-Packard Comapny||Black to color bleed control using specific polymers in ink-jet printing inks containing pigmented inks requiring dispersants|
|US6506245||Oct 27, 2000||Jan 14, 2003||Cabot Corporation||Ink jet inks, inks, and other compositions containing colored pigments|
|US6558459||Feb 27, 2001||May 6, 2003||Hewlett-Packard Development Company||Derivatization of dyes/pigments with crown ethers and inkjet printing fluids containing the same|
|US6599353||Apr 20, 2001||Jul 29, 2003||Berol Corporation||Shear-thinning writing compositions, writing instruments, and methods|
|US6663704||Jul 3, 2001||Dec 16, 2003||Berol Corporation||Pearlescent inks, writing instruments, and methods|
|US6710259||Sep 17, 2001||Mar 23, 2004||Electrochemicals, Inc.||Printed wiring boards and methods for making them|
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|US6749676||Jul 3, 2001||Jun 15, 2004||Berol Corporation||Erasable inks, writing instruments, and methods|
|US6863713||Dec 30, 1999||Mar 8, 2005||Cabot Corporation||Method to adsorb an adsorbate using modified carbonaceous material|
|US6986809||Jun 14, 2004||Jan 17, 2006||Berol Corporation||Erasable inks, writing instruments, and methods|
|US7186923||Dec 5, 2003||Mar 6, 2007||Electrochemicals, Inc.||Printed wiring boards and methods for making them|
|US7294185||Mar 22, 2004||Nov 13, 2007||Cabot Corporation||Reaction of carbon black with diazonium salts, resultant carbon black products and their uses|
|US7544238||Sep 29, 2000||Jun 9, 2009||Cabot Corporation||Modified pigments having steric and amphiphilic groups|
|US8034316||Nov 6, 2007||Oct 11, 2011||Cabot Corporation||Carbon blacks having low PAH amounts and methods of making same|
|US8710136||Aug 12, 2011||Apr 29, 2014||Cabot Corporation||Carbon blacks having low PAH amounts and methods of making same|
|US20020056686 *||Aug 31, 2001||May 16, 2002||Agathagelos Kyrlidis||Chromatography and other adsorptions using modified carbon adsorbents|
|US20040084321 *||Dec 5, 2003||May 6, 2004||Thorn Charles Edwin||Printed wiring boards and methods for making them|
|US20050034629 *||Mar 22, 2004||Feb 17, 2005||Belmont James A.||Reaction of carbon black with diazonium salts, resultant carbon black products and their uses|
|US20050119121 *||Jan 11, 2005||Jun 2, 2005||Ranjan Ghosal||Modified carbon adsorbents and processes for adsorption using the same|
|EP1388576A1||Jul 18, 2003||Feb 11, 2004||Hewlett-Packard Company||Fluid set for ink-jet printers|
|EP1900766A1||Jan 19, 2000||Mar 19, 2008||Cabot Corporation||Aggregates having attached polymer groups and polymer foams|
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|EP2316875A1||Jan 19, 2000||May 4, 2011||Cabot Corporation||Aggregates having attached polymer groups and polymer foams|
|WO2001081484A2 *||Apr 20, 2001||Nov 1, 2001||Berol Corp||Shear-thinning writing compositions, writing instruments, and methods|
|WO2002002700A2 *||Jul 3, 2001||Jan 10, 2002||Berol Corp||Erasable inks, writing instruments, and methods|
|U.S. Classification||524/557, 106/31.65, 106/415, 106/472, 106/31.64|