Thickening homopolymer, preparation process and cosmetic applications
US6375959B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 17, 1999 |
| Grant date | Apr 23, 2002 |
| Priority date | — |
| Expiry date | Feb 17, 2019 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61Q19/06
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Process for the preparation of a composition in the form of an inverted latex, comprising an oil phase, an aqueous phase, at least one emulsifier of water-in-oil (W/O) type, at least one emulsifier of oil-in-water (O/W) type, from 20% to 70% by weight, and preferably from 25% to 45% by weight, of a branched or crosslinked anionic polyelectrolyte based on a monomer possessing a strongly acidic function, characterized in thata) an aqueous solution containing the monomers and the optional additives and adjusted beforehand to a pH below 4 is emulsified in an oil phase in the presence of one or more emulsifiers of water-in-oil type,b) the polymerization reaction is initiated by introducing a free-radical initiator into the emulsion formed in a), after which the reaction is left to proceed,c) when the polymerization reaction is complete, one or more emulsifiers of oil-in-water type are introduced at a temperature below 50° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.