USE IN COSMETICS OF POLYMERS OBTAINED BY LOW-CONCENTRATION, INVERSE EMULSION POLYMERISATION WITH A LOW LEVEL OF NEUTRALISED MONOMERS

摘要

A cosmetic or dermatological composition comprising at least one aqueous phase, of a branched or crosslinked polymer is obtained by polymerization of an aqueous solution of one or more monomers in water-in-oil inverse emulsion, at least one of the monomers used being an acrylic monomer and one or more of the monomers used being a monomer bearing at least one weak acid function, the molar percentage of monomers bearing at least one weak acid function relative to all of the monomers used being at least 30 mol %. The polymerization is carried out with a concentration of all the monomers in aqueous solution lying in the range 1.3 mmol to 3.6 mmol per gram of aqueous solution. During the polymerization, at most 20% of the acid functions present on the monomers having at least one acid function are in neutralized form. The compositions are intended for treatment of keratinous materials.

主权项

1. The use, for producing a cosmetic or dermatological composition comprising at least one aqueous phase, of a branched or crosslinked polymer composed of the repetition of one or more monomeric units, with at least one of the monomeric units corresponding to a monomer comprising an acrylic group, and at least 30 mol % of the monomeric units bearing at least one weak acid function, possibly in neutralized form, said polymer being obtained:
by polymerization of an aqueous solution of one or more monomers in water-in-oil inverse emulsion, at least one of the monomers used being an acrylic monomer and one or more of the monomers used being a monomer bearing at least one weak acid function, the molar percentage of monomers bearing at least one weak acid function relative to all of the monomers used being at least 30%, the aqueous phase containing at least one monomer acting as branching agent, in such a manner that polymerization leads to a branched or crosslinked polymer, characterized in that: i) the polymerization is carried out with a concentration of all the monomers in aqueous solution lying in the range 1.3 mmol to 3.6 mmol per gram of aqueous solution; and ii) during the polymerization, at most 20% of the acid functions present on the monomers having at least one acid function are in neutralized form.