Composition for invisible ink responsive to infrared light

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...

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523161, 524277, 524563, 106 21A, 106 23B, 260DIG38, C08K 534

Patent

active

056840691

ABSTRACT:
An invisible ink has been discovered that utilizes a substituted phthalocyanine dye in combination with selected waxes and resins. The resulting ink is one that has use in thermal printing and is transparent or almost transparent in white light, but is responsive to infra-red light in the range of 720 to 1000 nm. The preferred waxes are polyethylene wax, natural paraffin wax and carnauba wax, and the preferred resin is ethyl vinyl acetate polymer.

REFERENCES:
patent: 3875199 (1975-04-01), Bloom
patent: 3999838 (1976-12-01), Sprokel
patent: 5084205 (1992-01-01), Auslander
patent: 5160171 (1992-11-01), Gregory et al.
patent: 5282894 (1994-02-01), Albert et al.
Novel Phthalocyanies for positive charging organic photoconductors by Peter Gregory presented to Society of Photographics Sciences & Electric Photography Conference Mar. 1988 in New Orleans, Louisiana.

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