Patent ID: 8545000
Filing Date: 2013-10-01
Classification: C08K,C09D

Abstract:
1. An ink composition comprising a wetting agent and water-insoluble polymer particles including a colorant and a water-insoluble polymer, wherein the content of free polymer derived from the water-insoluble polymer is 1.0% by mass or less with respect to the total mass of the ink composition, and wherein the wetting agent is at least one selected from the group consisting of urea, a urea derivative, a pyrrolidone derivative, an alkyl glycine represented by the following Formula I, glycyl betaine and a sugar: wherein in Formula I, R wherein the colorant is a quinacridone pigment, wherein the water-insoluble polymer comprises a structural unit which is represented by the following Formula (1) or Formula (3): wherein, in Formula (1) and Formula (3), R 1 represents a hydrogen atom or a substituent; in Formula (1) and Formula (3), J represents *—CO—, *—COO—, *—CONR 10 —, *—OCO—, a methylene group, a phenylene group or *—C 6 H 4 CO—and R 10 represents a hydrogen atom, an alkyl group, an aryl group or an aralkyl group; in Formula (1) and Formula (3), W represents a single bond or a divalent linking group; in Formula (1), A 1 represents a group selected from acridone or anthraquinone; in Formula (3), one of R 2 to R 5 represents a single bond to W, and the others each independently represent a hydrogen atom or a substituent; in Formula (3), R 6 to R 9 each independently represent a hydrogen atom or a substituent.