Improvements in ink formulations comprising gallium...

C - Chemistry – Metallurgy – 09 – B

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C09B 47/04 (2006.01) C09D 11/02 (2006.01) G06K 9/00 (2006.01)

Patent

CA 2656033

There is provided an aqueous formulation comprising an IR-absorbing naphthalocyanine dye of formula (II): or a salt form thereof, wherein: M is Ga(A1); A1 is an axial ligand selected from -OH, halogen, -OR3, -OC(O)R4 or -O(CH2CH2O)eR6 wherein e is an integer from 2 to 10 and R6 is H, C1-8 alkyl or C(O)C1-8 alkyl; R1 and R2 may be the same or different and are selected from hydrogen or C1-2 alkoxy; R3 is selected from C1-2 alkyl, C5-I2 aryl, C5-12 arylalkyl or Si(Rx)(Ry)(Rz); R4 is selected from C1-12 alkyl, C5-12 aryl or C5-12 arylalkyl; and Rx, Ry and Rz may be the same or different and are selected from C1-12 alkyl, C5-12 aryl, C5-12 arylalkyl, C1-12 alkoxy, C1-12 aryloxy or C5-12 arylalkoxy. The formulation has a pH in the range of 3,5 to 7 and is particularly suitable for use as an IR- absorbing inkjet ink, providing compatibility with known CMYK, inks together with an optimally red-shifted .lambda.max

L'invention concerne une formulation aqueuse contenant un colorant de naphthalocyanine absorbant le rayonnement infrarouge, de formule (II): ou une forme de sel de celle-ci. Dans cette formule, M représente Ga(A1); A1 représente un ligand axial choisi parmi -OH, un halogène, -OR3, -OC(O)R4 ou -O(CH2CH2O)eR6, e prenant la valeur d'un entier compris entre 2 et 10 et R6 représentant H, un alkyle en C1-8 ou un alkyle en C(O)C1-8; R1 et R2 peuvent être identiques ou différents et sont choisis parmi de l'hydrogène ou un alcoxy en C1-2; R3 est choisi parmi un alkyle en C1-2, un aryle en C5-I2, un arylalkyle en C5-12 ou Si(Rx)(Ry)(Rz); R4 est choisi parmi un alkyle en C1-12, un aryle en C5-12 ou un arylalkyle en C5-12; et Rx, Ry et Rz peuvent être identiques ou différents et sont choisis parmi un alkyle en C1-12, un aryle en C5-12, un arylalkyle en C5-12, un alcoxy en C1-12, un aryloxy en C1-12ou un arylalcoxy en C5-12. La formulation de l'invention possède un pH compris entre 3,5 et 7 et est particulièrement utile en tant qu'encre à jet d'encre absorbant le rayonnement infrarouge, offre une compatibilité avec les encres CMYK connues et un décalage optimal vers le rouge .lambda.max.

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