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US 5,288,493 AGranted
Skin care compositions with improved rub-off resistance
AssigneeNational Starch and Chemical Investment Holding Corporation
InventorsGary T. Martino, Dinesh C. Patel, Jacob J. Guth
Life of this patent
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Abstract
Skin care compositions, such as creams and lotions, wherein improved rub-off resistance is attained by including an effective amount of a copolymer comprising: a) 10-75% by wt. of a C.sub.1 to C.sub.18 alkyl acrylate/methacrylate, b) 10-70% by wt. of C.sub.1 to C.sub.18 N-substituted alkyl acrylamide, and c) 5-40% by wt. of unsaturated carboxylic acid having 3 to 5 carbon atoms.
Claims22
In a skin care composition having a vehicle comprising:
- i) an emulsion,
- ii) an oil base,
- iii) an aqueous system,
- iv) a solvent system, or
- v) a mixture of aqueous and solvent systems,
- wherein the aqueous system comprises from about 25 to 99.8% by weight water, from about 0.1 to 25% by weight of additives and ingredients, and from about 0 to 50% by weight of a propellant, and wherein the solvent system comprises from about 25 to 99.8% of organic solvent selected from the group consisting of aliphatic alcohols, esters, ethers, ketones, amines and hydrocarbons, from about 0.1 to 25% by weight of additives and ingredients, and from about 0 to 75% by weight of a propellant, the improvement comprising providing improved rub-off resistance by adding from about 0.1 to 10% by weight of a copolymer consisting essentially of:
- a) about 10 to 75% by weight of C.sub.1 to C.sub.18 alkyl acrylate or methacrylate,
- b) about 10 to 70% by weight of C.sub.1 to C.sub.18 N-substituted alkyl acrylamide, and
- c) about 5 to 40% by weigh of unsaturated carboxylic acid having 3 to 5 carbon atoms.
6 more elements
Dependencies are inferred from the claim text.