Increasing the molecular weight of polyesters

Details Increasing the molecular weight of polyesters Increasing the molecular weight of polyesters

C - Chemistry, Metallurgy

08

G

C08G 63/91 (2006.01) C08G 63/20 (2006.01) C08J 11/04 (2006.01) C08K 5/09 (2006.01) C08K 5/1539 (2006.01) C08K 5/5333 (2006.01) C08L 67/02 (2006.01)

Patent

CA 2181713

A process is disclosed for increasing the molecular weight of polyesters, polyester copolymers or polyester blends, which comprises heating a polyester blended with a tetracarboxylic acid dianhydride and a sterically hindered hydroxyphenylalkylphosphonic acid ester or half-ester to above the melting point (glass transition temperature) of the polyester.

L'invention concerne un procédé d'augmentation de la masse moléculaire de polyesters, de copolymères de polyesters ou de mélanges de polyesters, lequel consiste à chauffer un polyester mélangé à un dianhydride d'acide tétracarboxylique et un ester ou un demi-ester d'acide hydroxyphénylalkylphosphonique à encombrement stérique à une température supérieure au point de fusion (température de transition vitreuse du polyester).

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