Process for producing polymer

   
   

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.

Um processo para produzir um polímero biodegradable que tem livre carboxyl na omega.-extremidade charcterized polimerizando um composto cíclico do ester na presença de um derivative ácido hydroxymonocarboxylic que protegem carboxyl ou de um derivative ácido hydroxydicarboxylic que protege carboxyl, e então deprotecting o polímero assim obtido que protege carboxyl na omega.-extremidade. O uso do processo acima faz fácil de controlar nisso, desse modo o peso molecular do polímero biodegradable do alvo e o índice de carboxyl livre permitindo a produção eficiente de um polímero que tem um purity elevado e que está sendo contaminado com o catalizador do littel restante nisso.

 
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