Infrared absorptive jet printing ink

Compositions: coating or plastic – Coating or plastic compositions – Metal-depositing composition or substrate-sensitizing...

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106 20, 106 23, 260 292N, C09D 1102, C09D 1108, C09D 1110

Patent

active

042996309

ABSTRACT:
An improved infrared absorbing ink for jet printing comprises an aqueous solution of CI solubilized Sulfur Black, a thiosulfonic acid of 2,4-dinitrophenol, 1 dye with polyethylenimine as a binder. The preferred weight ratio is about 5 parts dye to 1.5 parts binder. Excessive cross-linking of the dye and the binder is prevented by adding sodium carbonate or other disclosed alkaline reagents in sufficient amount to prevent the pH of the solution from dropping below about 8.5 during a period of time equal to the expected shelf life of the ink.
The ink further comprises 4 to 10 percent by weight of a humectant to prevent water loss during use in a jet printer and 1 to 5 percent by weight of diethylene glycol to facilitate penetration of paper by the ink. The preferred embodiment also includes a bacteriacide/fungicide and a defoamer. The ink runs well in a multi jet printer, is waterproof when printed, smudge resistant and has a shelf life of over 11/2 years. It has high absorptivity at infrared wavelengths and is optically black.

REFERENCES:
patent: 3542681 (1970-11-01), Mutaffis
patent: 3579286 (1971-05-01), Heid et al.
patent: 3705043 (1972-12-01), Zabiak
patent: 3716525 (1973-02-01), Engelhardt et al.
patent: 3805273 (1974-04-01), Brady et al.
patent: 3846141 (1974-11-01), Ostergren et al.
patent: 3870528 (1975-03-01), Edds et al.
patent: 3903034 (1975-09-01), Zabiak

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