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HYDROTROPES TO IMPROVE THE CLARITY OF THERMAL INK JET TRANSPARENCIES

IP.com Disclosure Number: IPCOM000027564D
Original Publication Date: 1997-Dec-31
Included in the Prior Art Database: 2004-Apr-08
Document File: 4 page(s) / 205K

Publishing Venue

Xerox Disclosure Journal

Abstract

Transparencies for receiving images from aqueous inks, such as those commonly used in thermal ink jet printers, generally comprise a polymeric film base and a polymeric image receiving coating on at least one surface of the film base. The degree of transparency of the sheet can be undesirably impaired by haze in the polymeric image receiving coating. In some instances, it is believed that haze forms in this layer as a result of crystate formation or polymer crystallization in the polymeric image receiving coating material. It is proposed herein to suppress haze in the polymeric image receiving layer of transparencies by incorporating into the image receiving layer one or more hydrotropic materials.

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XEROX DISCLOSURE JOURNAL

Proposed Classification
U. S. C1. 106/020R Int. Cl. C09d 11/00

Transparencies for receiving images from aqueous inks, such as those commonly used in thermal ink jet printers, generally comprise a polymeric film base and a polymeric image receiving coating on at least one surface of the film base. The degree of transparency of the sheet can be undesirably impaired by haze in the polymeric image receiving coating. In some instances, it is believed that haze forms in this layer as a result of crystate formation or polymer crystallization in the polymeric image receiving coating material. It is proposed herein to suppress haze in the polymeric image receiving layer of transparencies by incorporating into the image receiving layer one or more hydrotropic materials.

The hydrotropes suitable for the present invention are potent agents in the suppression of crystal formation and the enhancement of solubility of complex organic materials in solvent systems, particularly water. It is believed that there is a formal analogy between nucleation processes in the substrate coating and in fluid solution, leading to the conclusion that hydrotropes are effective in combating the haze problem.

Typical polymeric materials used in image receiving coatings on transparencies which may be subject to haze include (a) cellulose derivatives such as hydroxypropyl methyl cellulose, carboxymethyl cellulose, hydroxyethyl methyl cellulose, and the like; (b) polyethylene oxide and its derivatives; (c) various latexes; and the like.

The hydrotrope is admixed with the polymeric material in any effective relative amounts, typically from about 5 percent by weight hydrotrope and about 95 percent by weight polymeric material to about 33 percent by weight hydrotrope and about 67 percent by weight polymeric material Preferably, the hydrotrope is present in the hydrotrope/polymer blend in an amount of at least about 10 percent by weight.

Examples of suitable hydrotropes include 3,5-dihydroxybenzoic acid, (5-carboxy-4-hexyl- 2-cyclohexen- 1-yl) octanoic acid, (6-carboxy-4-hexyl-2-cyclohexen- 1-yl) octanoic acid, saccharin salts, such as sodium saccharin, dihexyl sulfosuccinate salts, such as sodium dihexyl sulfosuccinate, benzoate salts, such as sodium benzoate, monohydroxy-substituted benzoate salts, including salicylate salts such as sodium salicylate, dihydroxy-substituted benzoate salts, trihydroxy-substituted benzoate salts, benzene sulfonate salts, such as

XEROX DISCLOSURE JOURNAL - Vol. 22, No. 6 NovemberDecember 1997 267

HYDROTROPES TO IMPROVE THE CLARITY OF THERMAL INK JET TRANSPARENCIES
William M. Schwarz, Jr.

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HYDROTROPES TO IMPROVE THE CLARITY OF THERMAL INK JET TRANSPARENCIES (CONT'D)

sodium benzene sulfonate, monohydroxy-substituted benzene sulfonate salts, dihydroxy- substituted benzene sulfonate salts, benzene disulfonate salts, such as sodium benzene disulfonate, to...