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INFRARED AND ULTRAVIOLET ACTIVE INK COMPOSITIONS

IP.com Disclosure Number: IPCOM000026968D
Original Publication Date: 1994-Aug-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 154K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is a dual image detection method which comprises formulating ink compositions containing both infrared (IR) and ultraviolet (UV) active components, printing ink images with the IR and UV active inks, and irradiating detecting with the appropriate detection means the IR and UV active ink components in the ink images. The IR and UV active ink images are optionally invisible. In combination with the respective image detection means, the IR and W images such as bar codes or mail codes can be used in printing and copying systems to enable various value added job functions in document services such as filing, hole punching, stapling, paper handling, selecting paper types, and the like. The fluorescent dyes and IR dyes useful in this are preferred to be water soluble or water miscible or water dispersible materials. The amount of each type of dye in the recording liquid can be less than 20% by weight and.preferably to be less than 5% if the absorption coefficient of the dye is high.

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XEROX DISCLOSURE JOURNAL

INFRARED AND ULTRAVIOLET Proposed Classification ACTIVE INK COMPOSITIONS U.S. C1.430/056
John Wei-Ping Lin Int. C1. G03g 15/01

Disclosed is a dual image detection method which comprises formulating ink compositions containing both infrared (IR) and ultraviolet (UV) active components, printing ink images with the IR and UV active inks, and irradiating detecting with the appropriate detection means the IR and UV active ink components in the ink images. The IR and UV active ink images are optionally invisible. In combination with the respective image detection means, the IR and W images such as bar codes or mail codes can be used in printing and copying systems to enable various value added job functions in document services such as filing, hole punching, stapling, paper handling, selecting paper types, and the like. The fluorescent dyes and IR dyes useful in this are preferred to be water soluble or water miscible or water dispersible materials. The amount of each type of dye in the recording liquid can be less than 20% by weight and.preferably to be less than 5% if the absorption coefficient of the dye is high.

The use of UV fluorescent and IR absorbing dyes in the ink jet ink allows the advantage of a dual image detection system. The bar codes of this invention can be detected both by a visible detector upon UV irradiation (and luminescence from the images and by an infrared detector when the near IR or

IR light source is used. Bar code images provide excellent detection capability and the detection can be tamper resistant.

Because the printed invisible images can contain both UV and IR absorbing dyes, the images created by the ink jet printing can be used for security markings for added security protection and prevention of forgery and prevention of unwanted copying without authorization. Invisible images containing both b.jV and IR absorbing dyes are extremely valuable for the applications for the financial institutes, banking industries, legal departments, government agencies, and certificate industries where security and document authenticity are important.

Example 1 (Ink containing an IR dye): A recording liquid (25490-6) comprising IR absorbing dye (1.0 g, IR absorber 109564 liquid from ICI company), ethyleneglycol (40 g), as a humectant, isopropanol (6 g), polyethyleneoxide (ave. mol. wt. 18,000, 0.1 g), and distilled water (153.7 g) was prepared. The recording liquid was adjusted to pH = 7.5 and filtered

XEROX DISCLOSURE JOURNAL - VO~. 19, NO. 4 July/August 1994 343

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