Cosmetic emulsions containing N-vinylpyrrolidone-alkyl acrylate copolymers
AssigneeHenkel Kommanditgesellschaft auf Aktien
InventorsBrigitte Hase, Joachim Galinke, Bernd Wegemund
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Abstract
Water-in-oil emulsions wherein the emulsifier consists essentially of a copolymer or terpolymer of N-vinylpyrrolidone with a C.sub.6-24 alkyl or cycloalkyl acrylate or methacrylate, and vinyl acetate if desired, and the continuous phase is a cosmetically acceptable oily material which can be prepared easily, safely and inexpensively. The emulsions are substantially odorless and are cosmetically acceptable for the care of the skin.
Claims9
A cosmetic emulsion of the water-in-oil type consisting essentially of (1) from 2% to 20% by weight of a polymeric emulsifier capable of forming water-in-oil creams consisting essentially of a copolymer of (a) N-vinylpyrrolidone and (b) acrylates of the formula:
- ##STR3## wherein R is a member having from 6 to 24 carbon atoms selected from the group consisting of alkyl, alkenyl, cycloalkyl and alkylcycloalkyl, and R' is a member selected from the group consisting of hydrogen and methyl, and (c) vinyl acetate wherein the molar ratios of [(a)+(c)]:(b) are from 1:1 to 1:20 and the molar ratios of (c):(a) are 0:1 to 3:1, (2) from 20% to 75% by weight of water and (3) the remainder to 100% by weight of a cosmetically acceptable oily material.
In the method for the production of a cosmetic emulsion of the water-in-oil type comprising mixing an emulsifier capable of forming water-in-oil creams with a cosmetically acceptable oily material in the liquid phase at elevated temperatures, mixing therewith from 20% to 75% by weight of water, cooling under agitation and recovering said cosmetic emulsion of the water-in-oil type, the improvement consisting of adding from 2% to 20% by weight of a copolymer of (a) N-vinylpyrrolidone, (b) acrylates of the formula ##STR4## wherein R is a member having from 6 to 24 carbon atoms selected from the group consisting of alkyl, alkenyl, cycloalkyl and alkylcycloalkyl, and R' is a member selected from the group consisting of hydrogen and methyl, and (c) vinyl acetate wherein the molar ratios of [(a)+(c)]:(b) are from 1:1 to 1:20 and the molar ratios of (c):(a) are 0:1 to 3:1, (2) from 20% to 75% by weight of water and (3) the remainder to 100% by weight of a cosmetically acceptable oily material, as said emulsifier.
Dependencies are inferred from the claim text.