Method for controlled polymerization of o-carboxy anhydrides derived from α-hydroxy acids
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United States of America Patent
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May 5, 2009
Grant Date -
Oct 25, 2007
app pub date -
Apr 6, 2007
filing date -
Oct 8, 2004
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Abstract
The invention concerns a method for preparing poly(-hydroxy acids), the polymerization reaction being performed in controlled manner in the presence of a catalytic system including a base, said base being a 5- or 6-membered aromatic heterocycle comprising at least one endocyclic nitrogen atom, provided that when the base is used alone in the catalytic system, it does not represent pyridine, 2-methylpyridine, 2,6-dimethylpyridine or 2-methoxypyridine. The invention also concerns poly(-hydroxy acids) of formula (IV). Finally, the invention concerns the use of a poly(-hydroxy acid), obtainable by the inventive method, for vectoring active principles or for making biomaterials.
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