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INFRARED SENSITIVE PIGMENT BASED INK JET INKS

IP.com Disclosure Number: IPCOM000027474D
Original Publication Date: 1997-Apr-30
Included in the Prior Art Database: 2004-Apr-08
Document File: 2 page(s) / 84K

Publishing Venue

Xerox Disclosure Journal

Abstract

Infrared (IR) sensitive pigment based ink jet ink compositions that are useful in document authentication and security applications are disclosed. IR sensitive pigments include numerous members of the phthalocyanine family, for example, titanium phthalocyanine. A IR sensitive ink jet ink composition may be formulated by adding an IR sensitive pigment and a suitable dispersant to an aqueous solution. The resulting pigment dispersion is further ground to submicron sized particles by conventional means. Additional performance additives may then be added, for example, wetting agents, stabilizers, corrosion inhibitors, and the like to complete the formula. An example formulation follows:

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XEROX DISCLOSURE JOURNAL

INFRARED SENSITIVE PIGMENT BASED INK JET INKS
Raymond W. Wong
William B. Riske
James M. Duff
Melvin D. Croucher

Proposed Classification
U. S. C1. 346/140R Int. C1. Gold 15/18

Infrared (IR) sensitive pigment based ink jet ink compositions that are useful in document authentication and security applications are disclosed. IR sensitive pigments include numerous members of the phthalocyanine family, for example, titanium phthalocyanine. A IR sensitive ink jet ink composition may be formulated by adding an IR sensitive pigment and a suitable dispersant to an aqueous solution. The resulting pigment dispersion is further ground to submicron sized particles by conventional means. Additional performance additives may then be added, for example, wetting agents, stabilizers, corrosion inhibitors, and the like to complete the formula. An example formulation follows:

A phthalocyanine pigment PcGe(0H)z 6g, was mixed with Tamol SN, 3g (Rohm and Haas) and water, 8Og, in a Union Process 01 attritor. The mixture was attrited for 8 - 16 hours to reduce the particles to a non-settling submicron size distribution. Ethylene glycol (20g) was then added to lOOg of a dispersion containing 5 weight percent of solids. The resulting ink jet ink was then tested using a Hewlett Packard Deskjet printer. Excellent prints were obtained. The absorption spectra of the solid area of the print showed a distinct IR sensitive peak at 900 nm.

Color mixing of the pigments or col...