The main raw materials are terephthalic acid, succinic acid, adipic acid, butanediol, etc., generally containing two dibasic acids. Generating the esterification intermediate by esterification or co-esterification firstly, and then making them by co-polycondensation reaction. Mainly being used in fields such as packaging materials, films, and sheets.

Two different kinds of process：Batch process and continuous process. Batch process mainly includes double-reactor process and three-reactor process, etc.; Continuous process mainly includes four-reactor process and five-reactor process. For ultra-high molecular weight product, it is necessary to add or use a high-viscosity continuous polycondensation reactor unit.