Process for the preparation of lactic acid-based polyester

Details Process for the preparation of lactic acid-based polyester Process for the preparation of lactic acid-based polyester

1996-09-10

1998-12-01

Jagannathan, Vasu

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

Synthetic resins

From carboxylic acid or derivative thereof

528272, 528361, 528362, 528363, 528486, 528487, 528492, 528493, 528494, 528495, C08G 6308, C08F 2000

Patent

active

058440666

ABSTRACT:
The present invention provides a process for the preparation of a lactic acid-based polyester having an excellent moldability, storage stability and biodegradability which has a less residual lactide left therein and is less susceptible to decomposition of lactic acid-based polyester and attachment of sublimed lactide to the molding apparatus, etc. at the devolatilization step and molding step after the polymerization reaction of lactic acid-based polyester. In the present invention, an organic chelating agent is added to a lactic acid-based polyester to deactivate the esterification catalyst used in the preparation of the lactic acid-based polyester, making it possible to inhibit the decomposition of lactic acid-based polyester at the devolatilizing process and molding process after polymerization reaction. Accordingly, a process for the preparation of a lactic acid-based polyester useful as a packaging material such as film and sheet having a high molecular weight, a high heat resistance, good mechanical properties and excellent moldability, storage stability and biodegradability can be provided.

REFERENCES:
patent: 5338822 (1994-08-01), Gruber et al.
patent: 5585191 (1996-12-01), Gruber et al.
patent: 5593778 (1997-01-01), Kondo et al.
patent: 5686540 (1997-11-01), Kakizawa

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