Moisture-resistant skin treatment compositions

Claim 2

A moisture-resistant skin treatment composition in the form of a sun screen composition or moisturizer composition, in the form of an oil-in-water emulsion or a water-in-oil emulsion, consisting essentially of from about 50 to about 90% by weight water, from about 1 to about 10% by weight emollient, from about 1 to about 10% by weight emulsifier, a preservative and a secondary amide having the structure ##STR2## wherein R 1 and R 2 may be the same or different and represent saturated or unsaturated fatty acid residues containing 8 to 36 carbons and 0 to 3 double bonds, and 0 or 1 hydroxyl groups, in an amount within the range of from about 0.5 to about 10% by weight based on the total composition to impart moisture-resistance to said composition.

Claim 3

The composition as defined in claim 1 wherein R 1 and/or R 2 contains from about 12 to about 22 carbons.

Claim 4

The composition as defined in claim 1 wherein said secondary amide is N-stearyl stearamide, N-stearyl erucamide, N-erucyl erucamide, N-oleyl palmitamide, N-stearyl oleamide, N-erucyl stearamide, N-oleyl oleamide, N-palmityl palmitamide, N-behenylbehenamide, N-behenylerucamide, N-oleylstearamide, N-oleylbehenamide or N-erucylbehenamide, or N-stearyl hydroxystearamide.

Claim 5

The composition as defined in claim 1 wherein the secondary amide is N-stearyl stearamide.

Claim 6

The composition as defined in claim 1 in the form of a moisture-resistant sun screen composition and includes from about 1 to about 15% by weight of at least one ultraviolet absorbing agent.

Claim 7

The composition as defined in claim 1 wherein the ultraviolet absorbing agents include one or more UV-A absorbing and one or more UV-B absorbing agents.

Claim 8

The composition as defined in claim 6 wherein the UV-A absorbing agent or agents are present at from about 0.5% to about 10% by weight and the UV-B absorbing agent or agents are present at from about 3% to about 10% by weight.

Claim 9

The composition as defined in claim 7 wherein the UV-A absorbing agent is one or more selected from the group consisting of 2-(2'-hydroxy-5'-methylphenyl)benzotriazole; 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole; 2,4-dihydroxybenzophenone; 2-hydroxy-4-methoxybenzophenone; 2,2', 4,4'-tetrahydroxybenzophenone; 2,2'-dihydroxy-4,4'-dimethoxybenzophenone; 2,2'-dihydroxy-4-methoxybenzophenone; 2-ethylhexyl-4-phenylbenzophenone carbonate; 2-hydroxy-4-methoxy-4'-methylbenzophenone; 2-hydroxy-4-(n-octyloxy)benzophenone; 4-phenylbenzophenone; and 2-ethylhexyl-2-cyano-3,3'-diphenylacrylate and the UV-B absorbing agent is one or more selected from the group consisting of 4-(dimethylamino)benzoic acid, ethyl ester; 4-(dimethylamino)benzoic acid, 2-ethylhexyl ester; 4-(dimethylamino)benzoic acid, amyl ester; glyceryl p-aminobenzoate; isobutyl p-aminobenzoate; and isopropyl p-aminobenzoate.

Claim 10

The composition as defined in claim 7 wherein the UV-A absorbing agent is 2-hydroxy-4-methoxybenzophenone alone or in combination with 2,2'-dihydroxy-4-methoxybenzophenone and the UV-B absorbing agent is 4-(dimethylamino)benzoic acid, 2-ethylhexyl ester.

Claim 11

The composition as defined in claim 1 wherein water is present in an amount of from about 50 to about 90% by weight, emollients are present in an amount of from about 1 to about 10% by weight, emulsifiers are present in an amount of from about 1 to about 5% by weight, thickeners are present in an amount of from about 0.1 to about 1% by weight, humectants are present in an amount of from about 1 to about 5% by weight, preservatives are present in an amount of from about 0.5 to about 1% by weight.

Claim 12

The composition as defined in claim 5 offering maximum ultraviolet protection and moisture resistance comprising from about 60% to about 80% by weight of water, from about 2% to about 7% by weight of secondary amide, from about 1% to about 5% by weight of 2-hydroxy-4-methoxybenzophenone alone or in combination with 2,2'-dihydroxy-4-methoxybenzophenone, from about 5% to about 10% by weight of 4-(dimethylamino)benzoic acid, 2-ethylhexyl ester, from about 1% to about 10% by weight of emollients, from about 1% to about 5% by weight of emulsifiers, and up to about 1% by weight of combined preservatives, antioxidants and fragrances.

Claim 13

The composition of claim 11 comprising about 73% by weight of deionized water, about 4% by weight of N-stearyl stearamide, about 2% to about 4% by weight of 2-hydroxy-4-methoxy-benzophenone, up to about 1% by weight of 2,2'-dihydroxy-4-methoxybenzophenone, about 8% by weight of 4-(dimethylamino)benzoic acid, 2-ethylhexyl ester, from about 3% to about 8% by weight of emollients, from about 2% to about 4% by weight of emulsifiers, and up to about 1% by weight of combined preservatives, antioxidants and fragrances.

Claim 14

The composition as defined in claim 1 further including a thickener in an amount within the range of from about 0.05 to about 1% by weight.

Claim 17

The method as defined in claim 14 wherein the sun screen composition contains from about 3% to about 15% by weight of ultraviolet absorbing agents and the secondary amide is included at from about 0.5 to about 10% by weight of the composition.

Claim 18

The method as defined in claim 14 wherein the secondary amide is N-stearyl stearamide, N-stearyl erucamide, N-erucyl erucamide, N-oleyl palmitamide, N-stearyl oleamide, N-erucyl stearamide, N-oleyl oleamide, N-palmityl palmitamide, N-behenylbehenamide, N-behenylerucamide, N-oleylstearamide, N-oleylbehenamide, N-erucylbehenamide or N-stearyl hydroxystearamide.

Claim 19

The method as defined in claim 16 wherein the secondary amide is N-stearyl stearamide.

Claim 20

The composition as defined in claim 1 further including a thickener in an amount within the range of from about 0.05 to about 1% by weight.