Dainichiseika Color & Chemicals Mfg. Co., Ltd.

Takaaki Ota

Atsushi Nogami

Michiei Nakamura

Yoshikazu Murakami

Hiroyuki Shimanaka

Yoshio Abe

Toru Kawakami

Mitsuo Noda

Yasutaka Momoi

Satoshi Isobe

Jyunki Takada

Satoshi Dosho

Kotaro Oshima

Toshimichi Sano

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.

Pigment dispersants, their production process, and their use

A colored resin water distribution pipe formed of a colored resin composition which comprises a polyolefin resin as a main component and a blue fine powder pigment of a composite oxide which comprises two or more metal oxides and has a spinel crystal structure and a BET specific surface area of about 30 m /g or more. The blue fine powder pigment is covered with an inorganic compound. The blue fine powder pigment is preferably treated mechanochemically by grinding. The colored resin water distribution pipe exhibits excellent resistance to water containing chlorine as a bactericide so that discoloration of the coloring component and formation of blisters on the inner face of the pipe by water containing chlorine are prevented.

Colored resin water distribution pipe

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Chuo-ku, Japan

Takaaki Ota