Browse Prior Art Database

METHOD TO IMPROVE WATERFASTNESS OF THERMAL INK JET INK

IP.com Disclosure Number: IPCOM000027165D
Original Publication Date: 1995-Aug-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 58K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is a method to improve waterfastness of thermal ink jet ink comprising formulating an ink jet ink containing water, Mitsubishi MKJA dye (37.53%), sulfolane (lo%), 2-pyrrolidinone (lo%), triethanolamine (l%), and polyethylene oxide (0.05%), and thereafter the pH is adjusted with thorough mixing with concentrated hydrochloric acid (0.5%) to about 7.69. Waterfastness of the ink formulations are about 90% on Courtland 4024 paper and about 94% on Hammermill 3V paper and exhibit solid area optical densities of 1.20 to 1.31.

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XEROX DISCLOSURE JOURNAL

METHOD TO IMPROVE Proposed Classification WATERFASTNESS OF THERMAL U.S. C1.346/140
INK JET INK
Miquel A. Fontanez
Richard L. Colt
Louis V. Isganitis

Int. C1. Gold 15/16

Disclosed is a method to improve waterfastness of thermal ink jet ink comprising formulating an ink jet ink containing water, Mitsubishi MKJA dye (37.53%), sulfolane (lo%), 2-pyrrolidinone (lo%), triethanolamine (l%), and polyethylene oxide (0.05%), and thereafter the pH is adjusted with thorough mixing with concentrated hydrochloric acid (0.5%) to about 7.69. Waterfastness of the ink formulations are about 90% on Courtland 4024 paper and about 94% on Hammermill 3V paper and exhibit solid area optical densities of 1.20 to 1.31.

The improved waterfastness properties of the ink are believed to be attributable to the increased acidity of the ink formulation and the associated effects of the acid on the dye component such as enhanced absorption and adsorption properties of ink and paper. The acidification method producing improved waterfastness is believed to be applicable to a variety of related dyestuffs and ink jet ink formulations.

REFERENCES

A related method for improving waterfastness of ink jet images is disclosed in Xerox Disclosure Journal, Vol17, No. 2, Mar/Apr, 1992, p. 79.

XEROX DISCLOSURE JOURNAL - VOI. 20, NO. 4 JuIy/August 1995 303

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304 XEROX DISCLOSURE JOURNAL - VOI. 20, NO. 4 July/August 1995

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