Daicel Chemical Industries, Ltd.

Tayca Corporation

Hinomaru Kogyo Corporation

Teruo Aoe

Masanori Itoh

Akira Miyazawa

Yoshitaro Tanaka

Shigemi Aruga

Takuma Miyazawa

Minoru Tanaka

Nobuo Iwane

Osamu Ikemoto

Flocculant compositions and water treatment method using the same

A composition comprises a cellulose acetate or other cellulose ester, and an anatase-type titanium oxide having (1) a specific surface area of not less than 30 m.sup.2 /g, (2) a primary particle size of 0.001 to 0.07 .mu.m, or (3) a specific surface area of not less than 30 m.sup.2 /g and a primary particle size of 0.001 to 0.07 .mu.m. For improving the photodegradability and the dispersibility, the surface of the titanium oxide may be treated with a phosphoric acid salt or other phosphorus compound, a polyhydric alcohol, an amino acid or others. Use of a low-substituted cellulose ester with an average substitution degree not exceeding 2.15 insures high biodegradability. The composition may further contain a plasticizer and/or an aliphatic polyester, a biodegradation accelerator (e.g. organic acids or esters thereof). The degradable cellulose ester composition is highly photodegradable and moldable and hence useful for the manufacture of various articles.

Cellulose ester compositions and shaped articles

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Okayama, Japan

Teruo Aoe