Optically active block polyester copolymer and method for produc

Details Optically active block polyester copolymer and method for produc Optically active block polyester copolymer and method for produc

1997-01-22

1998-11-24

Short, Patricia A.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525415, 528357, 528359, C08G 6308, C08G 6385

Patent

active

058408118

ABSTRACT:
An optically active block polyester copolymer formed of structural units represented by the following general formulas (I) and (II): ##STR1## wherein represents for an asymmetric carbon atom and m and n each represents a natural number in the range of from 300 to 5000 is obtained by subjecting an optically active butyrolactone and a species of lactone other than the optically active butyrolactone to sequential ringopening copolymerization in the presence of a catalyst. This optically active block polyester copolymer possesses a high molecular weight and a high melting point (not less than 130.degree. C.) and forms a biodegradable and hydrolyzable material of high strength capable of tolerating the impacts of actual use.

REFERENCES:
patent: 5124371 (1992-06-01), Tokiwa
patent: 5430125 (1995-07-01), Hori
patent: 5439985 (1995-08-01), Gross
patent: 5440007 (1995-08-01), Gross

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