Sunscreen compositions
US5250289A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 11, 1990 |
| Grant date | Oct 5, 1993 |
| Priority date | — |
| Expiry date | Jan 11, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2004/84
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A sunscreening composition which comprises a water-in-oil emulsion which comprises a) 0.5 to 30% by weight of titanium dioxide having a mean primary particle size of less than 100 nm, b) 5 to 20% by weight of an oil phase, c) 1 to 15% by weight of an emulsifier, and d) at least 40% by weight of an aqueous phase. The titanium dioxide may be coated with aluminium stearate. Further sunscreening agents may be included. The oil phase may be a hydrocarbon oil, a wax, a natural oil, a silicone oil or a mixture. Preferred emulsifiers are sesquioleates such as polyglyceryl-2-sesquioleate or sorbitan sesquioleate, polyethoxylated esters of derivatives of natural oils such as polyethoxylated esters of hydrogenated castor oil or silicone emulsifiers such as silicone polyols.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.