Cosmetic emulsions containing N-vinylpyrrolidone/vinyl alkylcarboxylate copolymer
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 copolymers of N-vinylpyrrolidone and a vinyl C.sub.5-24 alkylcarboxylate (if desired with vinyl acetate) and the continuous phase is a cosmetically acceptable oily material can be prepared easily, safely and inexpensively. The emulsions are substantially odorless and are cosmetically acceptable for the care of the skin.
Claims8
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 of a copolymer of (a) N-vinylpyrrolidone, (b) at least one vinyl C.sub.5-24 alkylcarboxylate of the formula ##STR3## wherein R is alkyl having from 5 to 24 carbon atoms, and (c) vinyl acetate wherein the molar ratios of [(a) + (c)]:
- (b) are from 1:2 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 process of preparing a cosmetic emulsion of the water-in-oil type comprising mixing an emulsifyingly effective amount of an emulsifier capable of forming water-in-oil creams with a cosmetically acceptable oily material in the liquid phase at elevated temperatures, mixing from 20% to 75% by weight of water thereto, cooling with agitation and recovering a cosmetic emulsion of the water-in-oil type, the improvement consisting of mixing from 2% to 20% by weight of a copolymer of (a) N-vinylpyrrolidone, (b) at least one vinyl C.sub.6-24 alkylcarboxylate of the formula ##STR4## wherein R is alkyl having 5 to 24 carbon atoms, and (c) vinyl acetate, wherein the molar ratios of [(a) + (c)]:(b) are from 1:2 to 1:20 and the molar ratios of (c):(a) are 0:1 to 3:1, as said emulsifier.
Dependencies are inferred from the claim text.