Process for producing polyhydroxycarboxylic acid

Details Process for producing polyhydroxycarboxylic acid Process for producing polyhydroxycarboxylic acid

1997-10-10

1999-09-14

Truong, Duc

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

Synthetic resins

From carboxylic acid or derivative thereof

528354, 528357, C08G 6356

Patent

active

059524553

ABSTRACT:
The present invention provides a process for producing polyhydroxycarboxylic acids which have a weight-average molecular weight of 50,000 or above and which are excellent as biodegradable plastics by polycondensing hydroxycarboxylic acids or oligomers thereof in the presence of an inorganic solid acid catalyst in combination with an alkali metal or an alkaline earth metal.

REFERENCES:
patent: 4767628 (1988-08-01), Hutchinson
patent: 5302693 (1994-04-01), Stricker et al.
patent: 5310865 (1994-05-01), Enomoto et al.
patent: 5440008 (1995-08-01), Ichikawa et al.
Polymer Preprints, Japan, vol. 44, No. 12 (1995), pp. 3140-3147.
Allowed claims of the Application Serial No. 08/849,389.

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