Dainichiseika Color & Chemicals Mfg. Co., Ltd.

Jyunki Takada

Yoshikazu Murakami

Hiroyuki Shimanaka

Takaaki Ota

Satoshi Isobe

Satoshi Dosho

A pigment dispersant contains (a) 5 to 30 wt % of aromatic and/or heterocyclic vinyl monomer units, (b) 10 to 30 wt % of monomer units having acid groups, (c) 40 to 80 wt % of (meth)acrylate ester monomer units, and (d) 5 to 30 wt % of monomer units having poly(C-alkylene glycol) chains or mono(C-alkyl)ether chains of said glycol, said poly(C-alkylene glycol) chains or mono (C-alkyl)ether chains having a number average molecular weight of from 150 to 1,500. A sum of the monomer units (a) to (d) amounts to 100 wt %. The pigment dispersant has an acid value of from 30 to 300 mgKOH/g, a number average molecular weight of from 5,000 to 30,000, and a content of organic compounds, boiling points of which are not higher than 250&#xb0; C., of not higher than 0.2 wt %. Also disclosed are its production process, its aqueous solution and its dispersion.

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Chuo-ku, Japan

Jyunki Takada