Compositions comprising solid particles entrapped in collapsed polymeric microspheres, and methods of making the same
US8632816B2 · kind B2 · utility
0Cited by
34References
37Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 22, 2012 |
| Grant date | Jan 21, 2014 |
| Priority date | — |
| Expiry date | Mar 22, 2032 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61Q19/00
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The present invention relates to topical compositions containing solid particles that are stabilized via entrapment by microspheres and methods for making the same. Each of the microspheres contains a collapsed polymeric shell that has entrapped therein one or more solid particles. The solid particles are preferably formed of zinc oxide or titanium dioxide or both, which can readily be used either alone or in combination with other sunscreen agents to form sunscreen compositions of broader UV protection spectrum and enhanced photostability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.