ISOTACTIC POLYLACTIC ACID AND METHOD FOR PRODUCING SAME

Method of polymerization for producing polylactic acid of configuration L or D, with number-average molecular weight between 60 000 and 200 000 having an insertion defect rate between 0 and 0.5 wt. % of polylactic acid and a racemization defect rate between 0 and 2.5 wt. % of polylactic acid, charac...

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Bibliographic Details
Main Authors COUPIN THIERRY, HOTTOIS DELPHINE, COSZACH PHILIPPE
Format Patent
LanguageEnglish
Korean
Published 21.09.2011
Subjects
CHEMISTRY
COMPOSITIONS BASED THEREON
COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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:Method of polymerization for producing polylactic acid of configuration L or D, with number-average molecular weight between 60 000 and 200 000 having an insertion defect rate between 0 and 0.5 wt. % of polylactic acid and a racemization defect rate between 0 and 2.5 wt. % of polylactic acid, characterized in that the method is a bulk process comprising contacting, at a temperature between 170 and 200° C. and for a reaction time between 5 and 75 minutes, the corresponding lactide of stereochemical configuration L-L or D-D having an optical purity of L or D of at least 99.5 wt. % with at least one catalyst in the presence of an initiator to form poly-L-lactic acid or poly-D-lactic acid.
Bibliography:Application Number: KR20117016312