Ink compositions containing lanthanide complexes

C - Chemistry – Metallurgy – 09 – D

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C09D 11/00 (2006.01) B41M 3/14 (2006.01)

Patent

CA 2473180

The invention relates to an ink composition containing (a) a compound of formula (I), Lm-Ln 3+(Ch-)n (I), wherein Ln represents a lanthanide, CH- is a negatively charged ligand containing at least one UV absorbing double bond, n denotes 3 or 4, m denotes a number from 1 to 4, in case n is 3, m denotes a number from 1 to 4 and L is a neutral monodentate or polydentate nitrogen-, oxygen- or sulfur-containing UV absorbing ligand with the exception of 2,2'- bipyridyl or, in case n is 4, m denotes 1 and L is a single-charged cation; and (b) a liquid ink carrier, which can be used for applying hidden mark on objects which can only be revealed under UV exposure.

L'invention porte sur une composition d'encre contenant (a) un composé de formule (I), L¿m?-Ln ?3+¿(Ch?-¿)¿n? (I), dans laquelle Ln représente un lanthanide, CH?-¿ est un ligand à charge négative contenant au moins une liaison double à absorption de rayons UV, n représente 3 ou 4, m représente un chiffre compris entre 1 et 4, si n représente 3, m représente alors un chiffre compris entre 1 et 4 et L est un ligand à absorption de rayons UV contenant de l'azote, de l'oxygène ou du soufre monodentelé ou polydentelé neutre, à l'exception de 2,2'-bipyridyle ou, si n représente 4, m représente alors 1 et L est un cation à charge simple ; et (b) un support d'encre liquide. Cette composition d'encre peut servir à appliquer des marques cachées sur des objets qui ne peuvent être révélées que par exposition aux rayons UV.

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