Purification process of aliphatic polyester

Details Purification process of aliphatic polyester Purification process of aliphatic polyester

1995-11-29

1997-10-21

Acquah, Samuel A.

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

Synthetic resins

Treating polymer containing material or treating a solid...

528272, 528361, 528365, 528486, 528487, 528490, 528491, 528501, 525437, 524 81, 524155, 524417, 524418, 524779, 210772, 210773, 210774, C08F 602, C08J 300

Patent

active

056797672

ABSTRACT:
The invention is a purification process of an aliphatic polyester prepared in the presence of a catalyst from a hydroxycarboxylic acid or a cyclic ester of a hydroxycarboxylic acid, or a combination of an aliphatic polyhydric alcohol with an aliphatic polybasic acid, or a mixture of these compounds, comprising deactivating the catalyst while maintaining the aliphatic polyester in a molten or dissolved state, or insolubilizing and separating the catalyst and successively removing low molecular compounds; and can provide aliphatic polyester which has a low content of unreacted monomers and low molecular weight compounds and is excellent in heat resistance and weatherability.

REFERENCES:
patent: 3629202 (1971-12-01), Gilkey et al.
patent: 4401804 (1983-08-01), Wooten et al.
patent: 4960866 (1990-10-01), Bendix et al.

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