Patent ID: 7598301
Filing Date: 2009-10-06
Classification: C09D

Abstract:
1. A water-based ink comprising a water dispersion of polymer particles including at least polymer particles A of a yellow pigment-containing water insoluble vinyl polymer A and polymer particles B of a pigment-free water insoluble vinyl polymer B, wherein the water insoluble vinyl polymer A is a polymer produced by polymerizing a monomer composition A containing [1] a polyoxyalkylene group-containing monomer, [2] a salt forming group-containing monomer, and [3] a monomer copolymerizable with the polyoxyalkylene group-containing monomer and the salt forming group-containing monomer, the water insoluble vinyl polymer B is a polymer produced by polymerizing a monomer composition B containing [4] a styrene monomer and [5] a plurality of monomers copolymerizable with the styrene monomer, and  has a minimum film forming temperature of 20° C. or above, wherein the polymer particles B have an average particle diameter of 30 to 60 nm, and wherein the plurality of monomers copolymerizable with the styrene monomer comprise a (meth)acrylic ester, an unsaturated amide compound, a monomer having two or more polymerizable double bonds in one molecule and an unsaturated carboxylic acid.