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|1. (WO2017152774) BIODEGRADABLE POLYESTER COMPOSITION|
|Applicants:||KINGFA SCI. & TECH. CO., LTD.
|Title:||BIODEGRADABLE POLYESTER COMPOSITION|
Disclosed is a biodegradable polyester composition, where the weight content of a cyclic ester as structurally represented by formula (I) is 100 ppm to 950 ppm based on the total weight of the biodegradable polyester composition, and the weight content of cyclopentanone is 0.5 ppm to 85 ppm based on the total weight of the biodegradable polyester composition. The present invention, by adding the cyclic ester and the coclypentanone to the composition, controls the content of the ester and that of the cyclopentanone in the composition within a certain range, thus increasing the thermal-oxidative aging resistance of the biodegradable polyester composition; also, a film produced by blow molding or a workpiece produced by injection molding produces a small amount of surface precipitates after being boiled in 95% ethanol at 40 °C for 240 h, has great surface appearance properties, and improves the degree of lubrication for the film during the blow molding process of the biodegradable polyester composition, when the rate of film blowing is at 176 kg/h, the range of the thickness of the film is < 0.2 μm, and the relative deviation in the thickness of the film is < 1%, thus ensuring the stability of film bubbles and the continuity of film blowing.