Transparent copolyester, preparing method thereof and articles made from the same

US9102782B2 · kind B2 · utility

Assignees

• CHINA PETROLEUM & CHEMICAL CORPORATION · CN
• BEIJING RESEARCH INSTITUTE OF CHEMICAL INDUSTRY, CHINA PETROLEUM & CHEMICAL CORPORATION · CN

Inventors

• Ning XU · Beijing, CN
• Guixiang Zhu · Beijing, CN
• Wei Zhang · Lianyungang, CN
• Ling Han · Beijing, CN
• Yi Zou · Portland, US
• Wenxi Ji · Beijing, CN

Key dates

• Filing date: Aug 9, 2012
• Grant date: Aug 11, 2015
• Expiry date: Aug 9, 2032

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G63/91
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a transparent copolyester, wherein the transparent copolyester comprises an aliphatic-aromatic copolyester segment A, a segment B having repeating units —O—CH(CH3)—C(O)—, and structural units C derived from polyisocyanate(s), wherein the weight ratio for the segment A, segment B and structural unit C is 100:(100-2000):(0.1-10) and wherein the weight-average molecular weight Mw of the transparent copolyester is from 50,000 to 1,000,000. The present invention further relates to a preparation method for a transparent copolyester, including polymerizing lactide, a hydroxyl-terminated aliphatic-aromatic copolyester and a polyisocyanate in the presence of a catalyst; wherein the weight ratio for the aliphatic-aromatic copolyester, lactide and polyisocyanate is 100:(100-2000):(0.1-10). The present invention further relates to a transparent copolyester prepared by said method and an article made from the transparent copolyester according to present invention.