Trisazo compound, ink composition, recording method and...

C - Chemistry – Metallurgy – 09 – B

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C09B 31/28 (2006.01) B41J 2/01 (2006.01) B41M 5/00 (2006.01) B41M 5/50 (2006.01) B41M 5/52 (2006.01) C07D 471/04 (2006.01) C09D 11/00 (2006.01)

Patent

CA 2635846

Disclosed is a trisazo compound represented by the formula (1) below or a salt thereof. (1) (In the formula, group A represents a substituted phenyl group; group B and group C respectively represent a substituted paraphenylene group; R1 represents a C1-C4 alkyl group which may be substituted by a carboxyl group, a phenyl group which may be substituted by a sulfo group or a carboxyl group; R2 represents a cyano group, a carbamoyl group or a carboxyl group; and R3 and R4 independently represent a hydrogen atom, a methyl group, a chlorine atom or a sulfo group.) Also disclosed is an aqueous black ink composition containing such a compound. Since the compound is highly soluble in a medium which is mainly composed of water, a high-concentration aqueous solution and ink containing the compound are stable even when they are stored for a long time. The compound enables to provide a black recorded image which is excellent in both light resistance and ozone gas resistance.

L~invention concerne un composé triazoïque de formule (1) ou l~un de ses sels. Dans la formule (1), A représente un groupe phényle substitué ; B et C représentent respectivement un groupe paraphénylène substitué ; R1 représente un groupe alkyle en C1 à C4 éventuellement substitué par un groupe carboxyle, un groupe phényle éventuellement substitué par un groupe sulfo ou un groupe carboxyle ; R2 représente un groupe cyano, un groupe carbamoyle ou un groupe carboxyle ; enfin R3 et R4 représentent indépendamment un atome d~hydrogène, un groupe méthyle, un atome de chlore ou un groupe sulfo. L~invention concerne également une composition aqueuse d~encre noire contenant ledit composé. En raison de la solubilité élevée dudit composé dans un milieu essentiellement composé d~eau, une solution aqueuse fortement concentrée et une encre contenant le composé sont stables, même lors d~un stockage prolongé. Le composé permet d~obtenir une image imprimée noire offrant une résistance élevée à la lumière et à l~ozone gazeux.

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