JP2006143883A5 - - Google Patents

Claims (8)

  A colorant comprising a polymer comprising a monomer unit having a structure in which a dye compound and a polyoxyether having an ethylenically unsaturated group are chemically bonded via a sulfonic acid group. The monomer unit is represented by the following formula (I):

(In the formula, R ₁ represents hydrogen or a methyl group, R ₂ represents a dye compound, m represents an integer of 1 to 4, and n represents an integer of 1 to 20).
A colorant represented by   The colorant according to claim 1, wherein n in the formula 1 is 6-13. The R _{2 in the} formula (I) is a dye compound selected from a phthalocyanine skeleton, an azo skeleton, an anthraquinone skeleton, a dioxazine skeleton, a benzimidazolone skeleton, a molybdate skeleton, and a pyrazolone skeleton. Coloring agent.   The colorant according to any one of claims 1 to 4, wherein the polymer further comprises a monomer unit having an ethylenically unsaturated bond and not having the dye compound.   The monomer unit having an ethylenically unsaturated bond, and the monomer unit not having the dye compound includes one or more selected from the group consisting of a styrene monomer and a (meth) acrylic acid monomer. The colorant according to claim 5, comprising:   The colorant according to claim 5 or 6, wherein the polymer comprises 30 to 100 mol% of a monomer unit represented by the formula (I).   An ink composition comprising the colorant according to any one of claims 1 to 7.