Patent ID: 8496744
Filing Date: 2013-07-30
Classification: C09B,C09D

Abstract:
1. An ink composition comprising an anthrapyridone dye and a copper phthalocyanine dye, wherein the hue angle in the L*a*b* color system calculated from spectral characteristics of a 1,000-fold diluted solution of the ink composition in water is 270° to 360° and wherein the content of the anthrapyridone dye is higher than the content of the copper phthalocyanine dye, the anthrapyridone dye being represented by formula (I): wherein M 1 is hydrogen, NH 4 , or sodium; R 1 is hydrogen, an optionally substituted alkyl group, an optionally substituted aryl group, or an optionally substituted benzoyl group; R 2 is hydrogen or an optionally substituted alkyl group; R 3 is hydrogen, a halogen, or an optionally substituted alkyl group; R 4 is hydrogen, an optionally substituted NH 4 , or an optionally substituted sulfonic acid group; and R 5 is an acyl group or a group represented by formula (II): (wherein X and Y are each independently chlorine or a hydroxy, amino, monoethanolamino, diethanolamino, morpholino, anilino, or phenol group optionally substituted with one or more substituents), the copper phthalocyanine dye being represented by formula (III): wherein R a is hydrogen, an alkali metal, or NH 4 ; R b is an alkali metal or NH 4 ; R c is hydrogen, an optionally substituted alkyl group, or an optionally substituted aryl group; k, l, and n are each 0 to 3; m is a natural number of 1 to 4; and k+l+m+n=4.