| abstract |
(57) [Problem] To provide a copolyester resin composition having excellent biodegradability and various physical properties, and a method for producing the same. SOLUTION: The method is characterized in that a copolyester resin is produced by reacting in a multi-step manner an aliphatic prepolymer having a number average molecular weight of 300 to 30,000 as a starting material to produce a copolyester resin. Aromatic groups are randomly distributed at the position of the dicarboxylic acid in the copolyester chain so that eight or more aromatic groups are not continuously bonded, and the number average molecular weight is 30,000 to 90,000. And a weight average molecular weight of 100,000 to 600,0. The melting point is 70 to 150 ° C., and the melt index is 0.1 to 50 g / 10 min (190 ° C., 2, 160 g). |