POLYMER, POLYMER COMPOSITION CONTAINING THE SAME, INK COMPOSITION, AND METHOD AND APPARATUS FOR APPLYING INK USING THE INK COMPOSITION

摘要

PROBLEM TO BE SOLVED: To provide a block polymer compound excellently dispersing a functional substance comprising a dye or a pigment, an ink composition containing the same and to provide a polymer compound excellent in fixing property of a printed image and an ink composition containing the same.

SOLUTION: The invention relates to the polymer compound comprising a first repeating unit structure exhibiting anionicity and a second repeating unit structure different from the first repeating unit structure, wherein the compositional ratio of the first repeating unit structure to the second repeating unit structure gradually changes along a monomer chain. The polymer comprises at least two block segments wherein at least one of the block segments contains a repeating unit structure exhibiting anionicity and a repeating unit exhibiting hydrophilicity. The ink composition comprises the block polymer, a solvent or a dispersing medium, and a coloring material.

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