Poly (ester-anhydrides) and intermediates therefor
US5756652A · kind A · utility
9Cited by
7References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 29, 1996 |
| Grant date | May 26, 1998 |
| Priority date | — |
| Expiry date | Feb 29, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G67/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Biodegradable poly(ester-anhydrides) designed to display two-stage degradation profiles are described. The presence of the anhydride linkages allows a relatively rapid decrease in molecular weight, the extent of which is governed by the concentration of the anhydride linkages along the chain, followed by possible dissolution and a slower degradation of the remaining oligomers, the rate of which is governed by the composition of the polyester prepolymers. Methods for the preparation of the poly(ester-anhydrides) and their polyester precursors are also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.