Patent ID: 7495039

Claim:
A water dispersion for ink jet recording, comprising water-insoluble vinyl polymer particles containing a pigment, wherein the water-insoluble vinyl polymer is a water-insoluble vinyl polymer obtained by polymerizing a monomer mixture comprising: (A) a monomer represented by the formula (I): wherein R 1 represents a hydrogen atom or a methyl group, R 2 represents a hydrogen atom, an alkyl group having 1 to 20 carbon atoms or a phenyl group whose hydrogen atom may be substituted with an alkyl group having 1 to 9 carbon atoms and m denotes a number from 30 to 100; (B) a salt-forming group-containing monomer; and (C) a monomer copolymerizable with monomers (A) and (B) and the average particle diameter of the water-insoluble vinyl polymer particles containing a pigment is 0.02 to 0.50 μm.