Gels formed by the interaction of polyvinylpyrrolidone with chitosan derivatives
US5420197A · kind A · utility
71Cited by
11References
32Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 13, 1994 |
| Grant date | May 30, 1995 |
| Priority date | — |
| Expiry date | Jan 13, 2014 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K2800/594
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A composition includes a stable gel of neutralized chitosan and poly(N-vinyl lactam), the poly(N-vinyl lactam) having a K value of at least about 60 and mole equivalents of acid groups above about 1.4 from ring-opened pyrrolidones. The composition may also include a substrate and various additives incorporated with the gel. A method for making the gel includes mixing the chitosan and poly(N-vinyl lactam) in aqueous solution and curing. Products include wound packings, wound dressings, burn dressings, drug delivery dressings, cosmetic face masks and cosmetic wrap dressings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.