Water based inks containing near infrared fluorophores

Details Water based inks containing near infrared fluorophores Water based inks containing near infrared fluorophores

C - Chemistry, Metallurgy

09

D

C09D 11/10 (2006.01)

Patent

CA 2234714

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 water- dissipatable 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 %.

Cette invention concerne des encres contenant un composé fluorophore proche de l'infrarouge et qui a été incorporé dans une structure de polyester dispersible dans l'eau. Les encres décrites dans la présente invention sont, de préférence, sans couleur ou "invisibles", mais peuvent être légèrement colorées en cas de besoin. D'une manière plus précise, ces encres comprennent (A) entre 1 et 10 % en poids d'au moins un polyester dispersible dans l'eau et comprenant de 0,1 mg/l en poids à 10 % en poids d'un composé fluorophore proche de l'infrarouge et thermiquement stable qui a été copolymérisé dans ledit polyester; (B) entre 5 et 75 % en poids d'au moins un humectant aliphatique; (C) de 0 à 15 % en poids d'au moins un alcool aliphatique inférieur ne comportant pas plus de 3 atomes de carbone; et (D) de l'eau et, éventuellement, jusqu'à 2 % en poids d'un ou plusieurs additifs, les pourcentages en poids des composants A à D représentant 100 %.

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