| 摘要 |
<p>PURPOSE: To obtain a degradable cellulose ester composition high in both photodegradability and moldability, and useful for obtaining various molded products. CONSTITUTION: This composition comprises a cellulose ester such as cellulose acetate and anatase-type titanium dioxide >=30m<2> /g in specific surface area (1), 0.001-0.05μm in primary particle diameter (2), or 30m<2> /g in specific surface area and 0.001-0.05μm in primary particle diameter (3). For higher photodegradability and dispersibility, the titanium dioxide may be surface-treated with a phosphorus compound such as a phosphate, a polyhydric alcohol or an amino acid. Use of a low-substitution degree cellulose ester <=2.15 in average substitution degree can raise the biodegradability of this composition. Further, this composition may contain a plasticizer and/or aliphatic polyester and/or biodegradation promoter (e.g. an organic acid or its ester).</p> |
