Catalyst for production of polylactic acid by direct polycondensation method

The invention discloses a rare-earth catalyst for directly condensating lactic acid to prepare polylactic acid. The catalyst is the one-component rare-earth compound C1 or the composite system of C1 and volatile C2, wherein C1 is rare-earth compound as rare-earth oxide, rare-earth halide, rare-earth...

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Bibliographic Details
Main Authors LUAN YIXIAN, YU BO, FAN LING, HE YONG
Format Patent
LanguageChinese
English
Published 11.06.2008
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:The invention discloses a rare-earth catalyst for directly condensating lactic acid to prepare polylactic acid. The catalyst is the one-component rare-earth compound C1 or the composite system of C1 and volatile C2, wherein C1 is rare-earth compound as rare-earth oxide, rare-earth halide, rare-earth sulfonate and rare-earth carboxylate or the like, C2 is volatile acid as aliphatic sulfonic acid and aromatic sulfonic acid. The inventive catalyst system via direct condensation of lactic acid can quickly and economically prepare polylactic acid with good property and high molecular weight. Compared with tin catalyst, the rare-earth catalyst can effectively reduce transesterification of polymer in the polymerization process, to improve thermal stability of prepared polylactic acid.
Bibliography:Application Number: CN2006198166