Pigment composition, ink composition, printed article, inkjet recording method and polyallylamine derivative

摘要

The present invention provides: a pigment composition that includes at least (A) a polyallylamine derivative including at least 1% to 50% by mol of a structural unit represented by Formula (1-a), 49% to 95% by mol of a structural unit represented by Formula (1-b) and 1% to 30% by mol of a structural unit represented by Formula (1-c), and (B) a pigment, and improves pigment dispersibility and dispersion stability; an ink composition, a printed article and an inkjet recording method, which use the pigment composition; and a polyallylamine derivative useful for these.
<Chemistry id="chema01" num="0001"><Image id="ia01" he="41" wi="123" file="IMGA0001.TIF" imgContent="chem" imgFormat="TIFF" /></Chemistry>
In Formula (1-b), R<Sup>1</Sup> represents -NHCOR<Sup>3</Sup> or -NH<Sub>3</Sub><Sup>+</Sup>OCOR<Sup>3</Sup>, in which R<Sup>3</Sup> represents a residue obtained by removing a carboxy group from any one of polyester, polyamide or polyesteramide, which each have a free carboxylic acid. In Formula (1-c), R<Sup>2</Sup> represents -NHCOR<Sup>4</Sup> or - NH<Sub>3</Sub><Sup>+</Sup>OCOR<Sup>4</Sup>, in which R<Sup>4</Sup> represents an organic group having an aromatic ring or a heteroaromatic ring.