C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
31/154
C09D 11/02 (2006.01) C08L 79/02 (2006.01) C09D 11/00 (2006.01)
Patent
CA 1116393
Docket 6435 INFRARED ABSORPTIVE JET PRINTING INK Abstract Of The Disclosure An improved infrared absorbing ink for jet printing comprises an aqueous solution of CI solubilized Sulfur Black 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 1 1/2 years. It has high absorptivity at infrared wavelengths and is optically black. -1-
299295
Gowling Lafleur Henderson Llp
The Mead Corporation
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