Patent ID: 7566362
Filing Date: 2009-07-28
Classification: C09B,C09D

Abstract:
1. An ink comprising at least two coloring materials of a first coloring material and a second coloring material, wherein the first coloring material is a compound represented by the following general formula (I), and the second coloring material is a compound represented by the following general formula (II): wherein A, B, C and D are, independently of one another, an aromatic six-membered ring, M is a hydrogen atom, alkali metal, ammonium or organic ammonium, E is an alkylene group, X is a sulfo-substituted anilino group, carboxyl-substituted anilino group or phosphono-substituted anilino group, with the proviso that such a substituted anilino group may further have 1 to 4 substituents selected from the group consisting of sulfonic, carboxyl, phosphono, sulfamoyl, carbamoyl, hydroxyl, alkoxy, amino, alkylamino, dialkylamino, arylamino, diarylamino, acetylamino, ureido, alkyl, nitro, cyano, alkylsulfonyl and alkylthio groups and halogen atoms, Y is a hydroxyl group or amino group, and l, m and n have the following relationship: 0≦l≦2, 0≦m≦3, 0.1≦n≦3 and l+m+n=1 to 4; and wherein R 1 , R 2 , Y 1 and Y 2 are, independently of one another, a monovalent group, X 1 and X 2 are, independently of each other, an electron attractive group having a Hammett's σp value of 0.20 or more, Z 1 and Z 2 are, independently of each other, a hydrogen atom, substituted or unsubstituted alkyl group, substituted or unsubstituted alkenyl group, substituted or unsubstituted alkynyl group, substituted or unsubstituted aralkyl group, substituted or unsubstituted aryl group, or substituted or unsubstituted heterocyclic group, and M is a hydrogen atom, alkali metal, ammonium or organic ammonium.