Patent ID: 7247196
Filing Date: 2007-07-24
Classification: C09D

Abstract:
1. An ink jet black ink comprising at least a coloring material, wherein the coloring material is a compound represented by the following general formula (I) or a salt thereof; and wherein the ink jet black ink further comprises ethylene glycol or diethylene glycol, and wherein a content of ethylene glycol or diethylene glycol is 15 mass % or more and 30 mass % or less with respect to a total mass of the ink jet black ink: general formula (I): wherein R 1 , R 2 , R 3 and R 4 each independently represent a hydrogen atom; a hydroxyl group; an amino group; a carboxyl group; a sulfonic group; an alkyl group having 1 to 4 carbon atoms; an alkoxy group having 1 to 4 carbon atoms; an alkoxy group substituted with a hydroxyl group, an alkoxy group having 1 to 4 carbon atoms, a sulfonic group, or a carboxyl group; an alkoxy group having 1 to 4 carbon atoms which may be further substituted with a carboxyl group or a sulfonic group; or an amino group substituted with a phenyl group, an alkyl group, or an acyl group, and n represents 0 or 1.