Patent ID: 7795327

Claim:
A water dispersion for ink-jet printing, comprising colorant-containing water-insoluble vinyl polymer particles in which the water-insoluble vinyl polymer is a polymer containing constitutional units represented by the following formulae (1) and (2): wherein R 1 is a hydrogen atom or a methyl group; and R 2 is a substituted or unsubstituted arylalkyl group having 7 to 22 carbon atoms or a substituted or unsubstituted aryl group having 6 to 22 carbon atoms; and wherein R 3 is a hydrogen atom or a methyl group; R 4 O is an oxypropylene group; R 5 O is an oxyalkylene group having 2 or 4 carbon atoms; R 6 is a hydrogen atom, an alkyl group having 1 to 20 carbon atoms or a phenyl group which may be substituted with an alkyl group having 1 to 9 carbon atoms in which R 4 O and R 5 O are random-added or block-added, and when block-added, the structure may be in the form of either —COO—(R 4 O) x —(R 5 O) y —R 6 or —COO—(R 5 O) y —(R 4 O) x —R 6 ; and x and y represent average molar numbers of addition where x is a number from 1 to 30 and y is a number from 0 to 30, and if y is 2 or more, a plurality of the R 5 O groups may be the same or different a weight ratio of the constitutional unit represented by the formula (1) to the constitutional unit represented by the formula (2) in the polymer is in the range of from 1/1 to 5/1.