Celluloseesterzusammensetzungen und geformte Gegenstände

摘要

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<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<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.