PROCESS FOR PRODUCING ALIPHATIC POLYESTER

A process for producing an aliphatic polyester having a weight-average molecular weight of 50,000 to 1,000,000, characterized by subjecting a crystallized aliphatic polyester prepolymer having a weight-average molecular weight of 2,000 to 100,000 and obtained from an aliphatic dihydric alcohol and a...

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Main Authors HIRAOKA, SHOJI, KOTAKI, YASUSHI, TERADO, YUJI, TAKAGI, MASATOSHI, SAKAI, MASAYUKI, AJIOKA, MASANOBU, KIMURA, HIROSHI, OGAWA, SHINJI, SUIZU, HIROSHI, SUZUKI, HIROYUKI
Format Patent
LanguageEnglish
French
Japanese
Published 18.01.2001
Edition7
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Summary:A process for producing an aliphatic polyester having a weight-average molecular weight of 50,000 to 1,000,000, characterized by subjecting a crystallized aliphatic polyester prepolymer having a weight-average molecular weight of 2,000 to 100,000 and obtained from an aliphatic dihydric alcohol and an aliphatic dicarboxylic acid to solid-phase polymerization in the presence of a volatile catalyst. In the process, the catalyst can be removed simultaneously with and/or after the solid-phase polymerization while maintaining the same reaction system. The production process can hence be rationalized as compared with conventional techniques necessitating a troublesome step for catalyst removal. Consequently, the high-molecular aliphatic polyester obtained by the process is equal in stability to aliphatic polyesters obtained through conventional catalyst removal. L'invention porte sur un procédé de production d'un polyester aliphatique d'un poids moléculaire moyen compris entre 50 000 et 100 000 obtenu en soumettant un prépolymère de polyester aliphatique cristallisé d'un poids moléculaire moyen compris entre 2 000 et 100 000 obtenu à partir d'un alcool dihydrique aliphatique, ainsi qu'un acide dicarboxylique aliphatique, à une polymérisation en phase solide en présence d'un catalyseur volatile. On peut ainsi rationaliser le processus de production par rapport aux techniques classiques impliquant l'étape, source de complications, de l'extraction du catalyseur. En conséquence, les polyesters aliphatiques de poids moléculaire élevé ainsi obtenus présentent une stabilité égale à celle des polyesters aliphatiques à extraction du catalyseur par un procédé classique.
Bibliography:Application Number: WO2000JP04560