Ire Chemical Ltd.

Jung Nam Jun

Dong Hoon Kim

Jae Wang Lee

Hyun Soo Chung

Sock Woo Lee

The present invention relates to a high molecular weighted biodegradable polyester resin which can be used in medical, agricultural and fishery packaging materials by enhancing the low heat-resistance of the general aliphatic polyester and the preparing method for them. The present invention provides a polyester resin which is prepared by condense-polymerization after one or a plurality of condensation, esterification and ester-exchange reaction with main ingredients of (1) an aliphatic (including circular aliphatic) dicarboxylic acid (or an acid anhydride thereof) including an adipic acid, (2) an aliphatic (including circular aliphatic) glycol at least selected from one of 1,4-butanediol and ethyleneglycol with a little of a monomer including one or a plurality of an amine radical from 0.1 to 30% by weight which is about theoretical polyester weight acting as a functional radical, wherein the polyester resin has a number average molecular weight of 30,000 to 70,000, a weight average molecular weight from 160,000 to 600,000, a melting point from 45.degree. C. to 60.degree. C. and a melt flow index from 0.1 to 50 g/10 min(190.degree. C., 2,160 g) and the process for preparing and/or producing the same.

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Kyoungki-do, South Korea

Jung Nam Jun