SPF booster for use in alcohol base sunscreen formulations
US11185477B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jun 28, 2018 |
| Grant date | Nov 30, 2021 |
| Priority date | — |
| Expiry date | Sep 24, 2038 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K2800/654
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
An SPF booster is provided, comprising: a multistage polymeric particle having a core comprising polymerized units of a monoethylenically unsaturated carboxylic acid core monomer and a non-ionic ethylenically unsaturated core monomer; an inner shell comprising polymerized units of a non-ionic ethylenically unsaturated inner shell monomer; a monoethylenically unsaturated carboxylic acid inner shell monomer and an aliphatic inner shell monomer; an outer shell comprising polymerized units of a non-ionic ethylenically unsaturated outer shell monomer; an aliphatic outer shell monomer; a monoethylenically unsaturated non-carboxylic acid outer shell monomer and an ethylenically unsaturated surfactant outer shell monomer; wherein the core, when dry, contains a void; and wherein the multistage polymeric particle has an average particle size, when dry, of 50 to 1,000 nm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.