Patent ID: 9260589
Filing Date: 2016-02-16
CPC Classification: C08K,C09B,C09D

Claim Text:
1. An aqueous pigment dispersion liquid for inkjet comprising: a pigment in a range from 5 to 35 mass %; a pigment dispersant in a range from 0.5 to 25 mass %; an aqueous organic solvent, which is an organic solvent having miscibility with water, in a range from 5 to 30 mass %; and water in a range from 20 to 80 mass %, wherein the pigment dispersant comprises a graft copolymer in which a polymer chain A is grafted onto a polymer chain B, the polymer chain A comprises: the polymer chain A has a number average molecular weight in a range from 1,000 to 10,000, the polymer chain B comprises at least one material selected from the group consisting of a constituent unit derived from a second cycloalkyl group-containing (meth)acrylate, a constituent unit derived from a vinyl monomer having an aromatic ring, and a constituent unit derived from (meth)acrylate having an aromatic ring, a mass ratio A:B of the polymer chain A to the polymer chain B is in a range of 30 to 70:70 to 30, and the graft copolymer has a number average molecular weight in a range from 2,000 to 20,000.