Prolonged release microcapsules
US5814342A · kind A · utility
49Cited by
18References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 26, 1997 |
| Grant date | Sep 29, 1998 |
| Priority date | — |
| Expiry date | Feb 26, 2017 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K38/09
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
This invention provides a microcapsule designed for zero order release of a physiologically active polypeptide over a period of at least two months, which is produced by preparing a water-in-oil emulsion comprising an inner aqueous layer containing about 20 to 70% (w/w) of said polypeptide and an oil layer containing a copolymer or homopolymer having a weight-average molecular weight of 7,000 to 30,000, wherein the composition ratio of lactic acid/glycolic acid in the copolymer or homopolymer is 80/10 to 100/0, and then subjecting said water-in oil emulsion to microencapsulation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.