POLY(2-HYDROXYALKANOIC ACID) AND METHOD OF ITS MANUFACTURE

A method for manufacturing poly(2-hydroxyalkanoic acid) included the steps of a) mixing a cyclic diester of a 2-hydroxyalkanoic acid and a polymerization catalyst, b) polymerizing the cyclic diester to form poly(2-hydroxyalkanoic acid) in liquid phase, c) adding a phosphoric acid ester as a catalyst...

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Bibliographic Details
Main Authors DE VOS SIEBE CORNELIS, GOBIUS DU SART GERRIT, HAAN ROBERT EDGAR, LOVIAT FRANCOIS
Format Patent
LanguageEnglish
Published 30.07.2015
Subjects
CHEMISTRY
COMPOSITIONS BASED THEREON
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
THEIR PREPARATION OR CHEMICAL WORKING-UP
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Summary:A method for manufacturing poly(2-hydroxyalkanoic acid) included the steps of a) mixing a cyclic diester of a 2-hydroxyalkanoic acid and a polymerization catalyst, b) polymerizing the cyclic diester to form poly(2-hydroxyalkanoic acid) in liquid phase, c) adding a phosphoric acid ester as a catalyst deactivating agent to the liquid phase, d) applying a devolatilisation step to the liquid phase, and e) allowing the poly(2-hydroxyalkanoic acid) to solidify. The catalyst deactivating agent is added after the devolatilisation step is applied. The method results in an improved melt stability of the manufactured polymer.
Bibliography:Application Number: US201314421695