| abstract |
(57) [Summary] [Structure] [I] (1) An aliphatic dicarboxylic acid (or its acid anhydride) component containing succinic anhydride as an essential component, (2) glycol component, and (3) trivalent or higher valent component Melting point 60 ° C obtained by polycondensation of 3 components of polyhydric alcohol component Above, polyester (a) 1 with number average molecular weight of 10,000 or more [II] 0.3 to 5 parts by weight of a polyvalent isocyanate is added to 00 parts by weight of the polyester (a) in a molten state at a melting point of 20,000 or more. [Effect] A method for producing a high molecular weight aliphatic polyester useful for various uses such as a film, a molded article, and a fiber is provided. |