| abstract |
In the present invention, one compound selected from succinic acid, succinic anhydride, or succinic acid ester compound is used as an acid component, 1,4-butanediol is a diol component, and 2,2-dimethyl-1,3-propanediol is used. 1 to 30 mol% of the acid component and trifunctional or more than trifunctional polyfunctional compound are added at a ratio of 0.01 to 1 mol% with respect to the acid component and esterified or transesterified at a temperature of 220 ° C. or lower to obtain a reaction product. Polycondensation reaction at a temperature of 240 ~ 260 ℃ under a high vacuum of 1mmHg or less to obtain an aliphatic copolyester, and relates to a method for producing a film, characterized in that the melt extrusion. |