Inks and coatings for the production of oxygen sensitive...

C - Chemistry – Metallurgy – 09 – D

Patent

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C09D 11/00 (2006.01)

Patent

CA 2670080

An oxygen sensitive ink or coating with enhanced photostability, comprising an oxygen sensitive indicator, a photostabilizer, an oxygen permeable binder and a solvent mixture is provided. The oxygen sensitive indicator is selected from, but not limited to [Ru(L 1)(L2)(L3)]2+, wherein Ru represents the central ruthenium ion, Ll, L2 and L3 represent the bidentate ligands diphenylphenanthroline, phenanthroline or bipyridine ligands or optionally substituted variations of same with representative counter ions selected from (PF6)-, Cl-, BF4-, Br- and (C104)-, platinum or palladium based metallo- porphyrin. The photostabilizer is selected from, but not limited to CIBA TINUVIN 5236, TINUVIN 292, TINUVIN 123 and TINUVIN 272, TINUVIN 477W, DABCO and ascorbic acid. Oxygen sensitive elements incorporating the oxygen sensitive ink or coating are manufactured by printing on a continuous flexible or rigid substrate using printing method including ink-jet, gravure, flexographic, pad printing or pin printing.

L'invention porte sur une encre ou un revêtement sensible à l'oxygène présentant une photostabilité améliorée. Cette encre ou ce revêtement comprend un indicateur sensible à l'oxygène, un photostabilisant, un liant perméable à l'oxygène et un mélange de solvants. L'indicateur sensible à l'oxygène est choisi notamment dans [Ru(L1)(L2)(L3)]2+, où Ru représente l'ion ruthénium central, L1, L2 et L3 représentent les ligands bidentés : ligands diphénylphénanthroline, phénanthroline ou bipyridine ou des variantes éventuellement substituées de ceux-ci avec des contre-ions représentatifs choisis parmi (PF6)-, Cl-, BF4-, Br- et (ClO4)-, une métallo-porphyrine à base de platine ou palladium. Le photostabilisant est choisi notamment parmi CIBA TINUVIN 5236, TINUVIN 292, TINUVIN 123 et TINUVIN 272, TINUVIN 477W, DABCO et l'acide ascorbique. Des éléments sensibles à l'oxygène incorporant l'encre ou le revêtement sensible à l'oxygène sont fabriqués par impression sur un substrat flexible ou rigide continu par un procédé d'impression comprenant l'impression à jet d'encre, la gravure, l'impression flexographique, l'impression au tampon ou l'impression par points.

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