Patent ID: 9657187
Date: 2017-05-23
CPC Classifications: C09D

Claim:
1. An ink composition, comprising: a pigment; polymer particles; and a polar solvent with a boiling point of 150° C. or higher, wherein the polymer particles include a core polymer and a shell polymer that covers at least a portion of the core polymer, a glass transition point of the polymer that configures the core polymer is more than 10° C. lower than the glass transition point of the polymer that configures the shell polymer, the polymer that configures the shell polymer includes a polymer having a (meth)acrylate monomer unit and a carboxylic acid monomer unit, the content (solid content conversion) of the polymer particles is 1.0 mass % to 10 mass % with respect to the total amount of the ink composition, the content of the polar solvent is 10 mass % to 40 mass % of the total amount of the ink composition, and the viscosity reduction rate from the viscosity at 20° C. to the viscosity at 50° C. is 40% to 80%.