Method for controlled polymerization of o-carboxy anhydrides derived from α-hydroxy acids
US7528211B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Apr 6, 2007 |
| Grant date | May 5, 2009 |
| Priority date | — |
| Expiry date | May 30, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/08
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.