| abstract |
(57) [Summary] [Purpose] Various biodegradable and moldable products, For example, a biodegradable cellulose ester composition useful for obtaining a fiber molded article such as a cigarette filter is obtained. [Composition] The composition has an average degree of substitution of 2.15 or less, According to the test method according to ASTM 125209-91, it is composed of a cellulose ester containing 10% by weight or more of a low-substituted cellulose ester which decomposes by 60% by weight or more after 4 weeks. The composition may include a plasticizer and / or an aliphatic polyester, and a photodegradation promoter such as anatase type titanium oxide and / or a biodegradation promoter such as an organic acid or an ester thereof. The low-substituted cellulose ester has an average degree of polymerization of 50 to 250, an average degree of substitution of 1.0 to 2.15, and an equivalent ratio of the remaining amount of sulfuric acid to the alkali metal or alkaline earth metal of 0.1 to 1.1. It may be cellulose acetate or the like. |