Process for producing polymer

C - Chemistry – Metallurgy – 08 – G

Patent

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C08G 63/08 (2006.01) A61K 47/34 (2006.01) C08G 63/60 (2006.01) C08G 63/83 (2006.01) C08G 63/91 (2006.01) A61K 9/50 (2006.01)

Patent

CA 2355186

A process for producing a biodegradable polymer having free carboxyl at the .omega.-end charcterized by polymerizing, a cyclic ester compound in the presence of a hydroxymonocarboxylic acid derivative having protected carboxyl or a hydroxydicarboxylic acid derivative having protected carboxyl, and then deprotecting the thus obtained polymer having protected carboxyl at the .omega.-end. Use of the above process makes it easy to control the molecular weight of the target biodegradable polymer and the content of free carboxyl therein, thereby enabling the efficient production of a polymer having a high purity and being contaminated with littel catalyst remaining therein.

L'invention concerne un procédé de production d'un polymère biodégradable avec un carboxy libre à l'extrémité omega , ce procédé consistant tout d'abord à polymériser un composé ester cyclique en présence d'un dérivé d'acide hydroxymonocarboxylique avec un carboxy protégé, ou d'un dérivé d'acide hydroxydicarboxylique avec un carboxy protégé. Ce procédé consiste ensuite à débloquer le polymère ainsi obtenu, qui présente un carboxy protégé à l'extrémité omega . L'utilisation de ce procédé permet de réguler facilement la masse moléculaire et la teneur en carboxy libre du polymère biodégradable que l'on souhaite obtenir, et donc de produire efficacement un polymère de haute pureté faiblement contaminé par des restes catalytiques.

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