Patent ID: 8362138

Claim:
A dispersion of a water-insoluble colorant, comprising: fine particles of at least one kind of water-insoluble colorant dispersed in a water-containing medium; and a polymer compound having a structural unit represented by formula (I): wherein R 1 represents a hydrogen atom or a substituent; one of R 2 to R 5 represents a single bond which bonds to W, and the others each independently represent a hydrogen atom or a substituent; Q represents a group of atoms necessary for forming, with the carbon atoms, a ring; J represents —CO—, —COO—, —CONR 6 —, —OCO—, a methylene group, a phenylene group, or —C 6 H 4 CO—; R 6 represents a hydrogen atom, an alkyl group, an aryl group or an aralkyl group; W represents a single bond or a divalent linking group; and wherein the polymer compound is embedded into the water-insoluble colorant particle by a process comprising the steps of: dissolving the water-insoluble colorant, the polymer compound, and a base, into an aprotic water-soluble organic solvent; bringing the resultant solution into contact with an aqueous medium; and forming the fine particles of the water-insoluble colorant dispersed in the water-containing medium.