Preparation process of dl-lactic acid-glycolic acid-copolymer

Details Preparation process of dl-lactic acid-glycolic acid-copolymer Preparation process of dl-lactic acid-glycolic acid-copolymer

1988-07-08

1989-08-22

Nielsen, Earl

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

Synthetic resins

From carboxylic acid or derivative thereof

424426, C08G 6310

Patent

active

048597635

ABSTRACT:
A process for copolymerizing lactide and glycolide by using a specific amount of stannous octoate as a catalyst in the presence of a polymerization regulator at temperature of 200.degree.-230.degree. C. to prepare dl-lactic acid-glycolic acid-copolymers which contain 50-60 mol % of a dl-lactic acid unit and 40-50 mol % of a glycolic acid unit and have inherent viscosity of 0.4-0.6 in chloroform.

REFERENCES:
patent: 3284417 (1966-11-01), Hostettler et al.
patent: 3442871 (1969-05-01), Schmitt et al.
patent: 3839297 (1974-10-01), Wasserman et al.
patent: 4331652 (1982-05-01), Ludwig et al.

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