PBAT、PBST、PBSA（Polyterephthalate - succinic acid - butyl glycol adipate series）

The main raw materials are terephthalic acid, succinic acid, adipic acid, and butanediol, typically including two types of dibasic acids. They undergo partial esterification or co-esterification to form ester intermediates, followed by copolycondensation to obtain the final product. It is primarily used in packaging materials, films, sheets, and other fields.

Production facilities are categorized into batch and continuous types. The batch type mainly includes double-reactor and triple-reactor systems. Continuous production primarily employs a four-reactor or five-reactor process, with ultra-high molecular weight varieties requiring additional or high-viscosity continuous polycondensation reactor units.