Patent ID: 9447233
Filing Date: 2016-09-20
CPC Classification: C08G,C08L

Claim Text:
1. A continuous preparation method of a biodegradable aliphatic/aromatic polyester copolymer, the method comprising: performing a first esterification reaction of an aliphatic dihydroxy compound with an aliphatic dicarboxylic acid at a temperature of about 160° C. to about 185° C. or less; continuously performing a second esterification reaction of a reaction product from the first esterification reaction at a temperature of about 220° C. to about 250° C.; continuously performing a first polycondensation reaction of a reaction product from the second esterification reaction to obtain a prepolymer having a weight average molecular weight of about 6,900 to about 14,000; continuously performing a second polycondensation reaction of the prepolymer to obtain a second polycondensation reaction product; and continuously performing a third polycondensation reaction of the second polycondensation reaction product to prepare the biodegradable aliphatic/aromatic polyester copolymer, wherein the performing of the first esterification reaction or the continuously performing of the second esterification reaction comprises adding an aromatic carboxylic acid.