Patent ID: 6720367
Filing Date: 2004-04-13
Classification: C09D

Abstract:
An ink composition consisting essentially of an alkali-soluble colorant, a water-soluble organic solvent, water, a cationic, water-soluble resin, a base which is hydroxide of an alkali metal or an alkaline earth metal and, optionally, one or more of a nonionic water-soluble resin and an assistant selected from the group consisting of a penetration accelerator, a viscosity modifier, a surface tension modifier, a hydrotropy agent, a humectant, a pH adjustor, an antimold, a chelating agent, a preservative and a rust preventive; the cationic, water-soluble resin consisting of repeating units represented by the following formula (I): wherein R1 and R2 which may be the same or different represent C1-5 alkyl group, andn is 0, 1, or 2.