Patent ID: 7790783
Filing Date: 2010-09-07
Classification: C09D

Abstract:
1. A water-base ink composition comprising the following components: a chromatic color pigment covered with a water-insoluble vinyl polymer; a titanium dioxide pigment; a silica pigment; a branched diol and water; wherein the chromatic color pigment is a cyan pigment selected from the group consisting of C.I. pigment blue 15, 15:1, 15:2, 15:3, 15:4 and 16; wherein the water-insoluble vinyl polymer is obtained by copolymerizing: (1) a macromer; (2) a polyoxyalkylene group-containing monomer; (3) a salt-forming group-containing monomer and (4) a monomer that can be copolymerized with the macromer, polyoxyalkylene group-containing monomer, and salt-forming group-containing monomer respectively; wherein the branched diol is selected from the group consisting of 2-methyl-2-propyl-1,3-propanediol and 2-butyl-2-ethyl-1,3-propanediol; and wherein the weight ratio between a total of the titanium dioxide pigment and silica pigment, and the chromatic color pigment is 1:20 to 5:1.