Patent ID: 7553884
Filing Date: 2009-06-30
Classification: C09D

Abstract:
1. An ink set for use in ink-jet recording comprising at least 2 ink compositions having solid content concentrations which are different by more than 2% by mass, wherein said at least 2 ink compositions each comprise an aqueous medium, a pigment and a dispersant for dispersing the pigment, and the dispersant is a block copolymer having an A segment that is a hydrophobic segment, a B segment that is an oxyethylene-structure-containing nonionic hydrophilic segment, and a C segment that is an ionic hydrophilic segment, and wherein the ratio of the number of unit structures of the A segment to the number of oxyethylene structures contained in the B segment of the block copolymer contained in each of said at least 2 ink compositions is higher in the block copolymer contained in the ink composition having a relatively high solid content concentration than in the block copolymer contained in the ink composition having a relatively low solid content concentration.