WATER BASED INKS CONTAINING NEAR INFRARED FLUOROPHORES

摘要

The present invention provides inks which contain a near infrared fluorophoric compound incorporated into a water-dissipatable polyester backbone. The inks of the present invention are preferably colorless or "invisible" but could be made slightly colored if desirable. Specifically, the inks of the present invention comprise: (A) between 1 and 10 weight percent of at least one waterdissipatable polyester having from 0.1 ppm by weight to 10 % by weight of a thermally stable near infrared fluorophoric compound copolymerized therein; (B) between 5 and 75 weight percent of at least aliphatic humectant; (C) between 0 and 15 weight percent of at least one lower aliphatic alcohol of no more than 3 carbon atoms; (D) water and optionally up to 2 weight percent of one or more additives; wherein the weight percentages of components A-D equal 100 %.