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INK JET INK AND PAPER COMBINATION FOR IMPROVED PRINT QUALITY

IP.com Disclosure Number: IPCOM000027245D
Original Publication Date: 1995-Dec-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 4 page(s) / 147K

Publishing Venue

Xerox Disclosure Journal

Abstract

An ink jet ink containing a cationic, anionic or hydrogen bonding polymer is matched with a paper containing an oppositely charged polymer or complimentary hydrogen bonding polymer. The purpose is to speed ink immobilization time rather than drying time to improve print quality and throughput speed. Rapid immobilization time is achieved by formation of a polymer-polymer ionic pair, called a complex polyelectrolyte, or polymer polyelectrolyte gel to immobilize both the water and the ink. Current approaches use simple electrolytes and only immobilize the dye, leaving the water to spread through the paper.

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XEROX DISCLOSURE JOURNAL

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INK JET INK AND PAPER COMBINATION FOR IMPROVED US. C1.355/256 PRINT QUALITY
Diane M. Foley

Proposed Classification

Int. C1. G03g 15/10

Q

NMe3+ CI-

+

SO3 - Na +

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XEROX DISCLOSURE JOURNAL - Vol. 20 No. 6 NovernbedDecember 1995 507

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INK JET INK AND PAPER COMBINATION FOR IMPROVED PRINT QUALITY(Cont'd)

An ink jet ink containing a cationic, anionic or hydrogen bonding polymer is matched with a paper containing an oppositely charged polymer or complimentary hydrogen bonding polymer. The purpose is to speed ink immobilization time rather than drying time to improve print quality and throughput speed. Rapid immobilization time is achieved by formation of a polymer-polymer ionic pair, called a complex polyelectrolyte, or polymer polyelectrolyte gel to immobilize both the water and the ink. Current approaches use simple electrolytes and only immobilize the dye, leaving the water to spread through the paper.

A continuing problem in the development of ink jet media is water removal from aqueous ink jet inks. Water interaction with paper causes problems such as a smear, show through, bleed and feathering as the water carries the dissolved ink beyond the original mark. Traditional approaches to preventing this problem involve rapid removal of water, e.g. by microwave drying or immobilization of the dye by ionic bonding or surface adsorption to a component in the paper. A disadvantage to the microwave approach is that water from the paper is also removed leading to curl and brittleness. Immobilization of the dye alone still leaves the water from the ink to spread out of the original mark, possibly into an adjacent image. Thus, immobilizing both the water and the dye to stop the movement of water or ink away from the original mark is an expedient solution to the aforementioned problems. The paper can then be dried by less aggressive methods.

Polymers bearing pendant cationic and anion charged groups are well known and commercially available. The counterion is generally small and inorganic and the resulting polymer very water soluble. When two polymers bearing oppositely charged groups on the chain are combined, they may be precipitated from solution leaving the small inorganic ions dissolved or form an ionically crosslinked gel network in which water and small counterions are trapped. The polymer-polymer salt is cal...