Sunscreen compositions containing copolymers of isoprene butadiene and/or styrene to provide improved water resistance
US6312672A · kind A · utility
10Cited by
34References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 29, 1999 |
| Grant date | Nov 6, 2001 |
| Priority date | — |
| Expiry date | Oct 29, 2019 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K8/90
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The invention provides waterproof sunscreen compositions which include polymers of isoprene, butadiene and/or styrene, particularity conjugated dienes which may be subject to some degree of hydrogenation. A copolymer of two different conjugated dienes is preferred. The polymers may be selectively hydrogenated to produce polymers which have highly controlled amounts of unsaturation, thereby improving water resistancy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.