Toray Industries, Inc.

Natureworks LLC

Pujing Zuo

Yong Gen He

Xin Zeng

Bo Yu

Xiao Ping Guo

Masatoshi Aoyama

Hiroyuki Ome

Jing Lu

Tatsuya Nagano

Xiangqun Fan

Kexin Zhu

Tomoko Nasuno

Xiaji Dai

Zinong Ye

Yong He

A solid-phase polymerization method of high-molecular-weight aliphatic polyester conducts the solid-phase polymerization of aliphatic polyester prepolymer under a gas stream containing sulfonic acid catalyst. The method features preparing metal free aliphatic polyester with high molecular weight, good color and luster and perfect thermal stability efficiently. The non-metal-ion aliphatic polyester is not only applicable to common use, but is also suitable as high value-added medical material and packing material which contacts with food directly than other metal-containing polyester.

Solid-phase polymerization method for preparing high-molecular-weight aliphatic polyester

A method for producing an aliphatic polyester resin including a melt polymerization step and a subsequent solid phase polymerization step, using a sulfonic acid group-containing compound as a catalyst, wherein the addition amount of the sulfonic acid group-containing compound during melt polymerization is 300 to 3000 ppm with respect to a raw material monomer calculated as sulfur atoms, the content of the sulfonic acid group-containing compound during melt polymerization is 300 to 3000 ppm with respect to a produced polymer calculated as sulfer atoms, and a residual rate of the sulfonic acid group-containing compound after solid phase at polymerization is more than 50.

Method for producing aliphatic polyester resin, and an aliphatic polyester resin composition

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Shanghai, China

Pujing Zuo