| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject material containing an aliphatic polyester of high molecular weight, etc., having specific values L, (a) and (b) determined by a color-difference meter, little colored, capable of being colored to a desired color by pigments and useful for producing a forming such as container, film or fiber. SOLUTION: This plastic material has L-value, a-value and b-value determined by a color-difference meter of >=70, -30 to 30, and -30 to 30, respectively when it is formed into a homogeneous film having a membrane thickness of 100μm, and it is preferably composed of an aliphatic polyester of a high molecular weight (e.g. a polymer obtained by the polymerization of a 2-6C aliphatic dicarboxylic acid such as succinic acid with a 2-4C aliphatic glycol such as ethylene glycol or 1,4-butandiol, or a copolymer obtained by ring-opening polymerization of a cyclic acid anhydride such as succinic anhydride with a cyclic ether such as ethylene oxide). |
