Process for polymerizing poly(lactic acid)
US5075115A · kind A · utility
141Cited by
1References
3Claims
0Family size
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Key dates
| Filing date | Nov 30, 1990 |
| Grant date | Dec 24, 1991 |
| Priority date | — |
| Expiry date | Nov 30, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/06
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A process is provided for the condensation polymerizing lactic acid to a polymer with a weight average molecular weight of 2,500 to 4,500 containing less than 4% lactide and for a controlled release dosage form comprising a pharmaceutically active ingredient in a matrix of poly(lactic acid) and its copolymers with glycolic acid, valerolactone, .epsilon.-caprolactone, .epsilon.-decalactone, hydroxybutyric acid, .beta.-hydroxyvaleric acid and dioxanone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.