| US 7,462,363 B2 | ||
| Inverse latices of copolymers of AMPS and of N,N-dimethylacrylamide; cosmetic use | ||
| Olivier Braun, Castres (France); Paul Mallo, Croissy-sur-Seine (France); and Stephanie Basset, Castres (France) | ||
| Assigned to Societe d'Exploitation de Produits pour les Industries Chimiques Seppic, Paris (France) | ||
| Filed on May 24, 2006, as Appl. No. 11/439,208. | ||
| Claims priority of application No. 05 51370 (FR), filed on May 25, 2005. | ||
| Prior Publication US 2006/0269490 A1, Nov. 30, 2006 | ||
| Int. Cl. A61K 8/02 (2006.01); A61Q 17/04 (2006.01) | ||
| U.S. Cl. 424—401 [424/59] | 11 Claims |
| 1. A composition comprising:
an oil phase;
an aqueous phase;
at least one water-in-oil (W/O) emulsifying system;
optionally at least one oil-in-water (O/W) emulsifying system; and
from 20% to 70% by mass of a branched or crosslinked polyelectrolyte, wherein,
the polyelectrolyte is a copolymer of 2-acrylamido-2-methylpropanesulfonic acid partially or totally salified with N,N-dimethylacrylamide
and optionally one or more monomers chosen from monomers containing a partially or totally salified weak acid function and/or
from neutral monomers other than N,N-dimethylacrylamide,
the polyelectrolyte comprises between 95 mol % and 25 mol % of partially or totally salified 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic
acid monomer and between 5 mol % and 75 mol % of N,N-dimethylacrylamide monomer, and
said composition is an inverse latex.
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