| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a pigment composition improving pigment dispersibility and dispersion stability; an ink composition using it; printed matter; and a method for inkjet recording; as well as a polyallylamine derivative useful for them. <P>SOLUTION: A pigment composition includes (A) a polyallylamine derivative composed of 1 to 50 mol% of a structural unit represented by the general formula (1-a), 49 to 95 mol% of a structural unit represented by the general formula (1-b), and 1 to 30 mol% of a structural unit represented by the general formula (1-c); and (B) a pigment. In the formula (1-b), R<SP>1</SP>represents -NHCOR<SP>3</SP>or -NH<SB>3</SB><SP>+</SP>OCOR<SP>3</SP>, in which R<SP>3</SP>represents a residue obtained by removing carboxy groups from any one of polyester, polyamide, and polyesteramide having free carboxylic acid. In the formula (1-c), R<SP>2</SP>represents -NHCOR<SP>4</SP>or -NH<SB>3</SB><SP>+</SP>OCOR<SP>4</SP>, in which R<SP>4</SP>represents an organic group having an alicyclic structure. <P>COPYRIGHT: (C)2009,JPO&INPIT |
