Photoprotection compositions having improved substantivity

Claim 2

A sunscreen composition having improved substantivity and mois­ture resistance for topical use comprising: (a) from about 1% to about 40% of a sunscreen; (b) from about 0.01% to about 5% of an emulsifier selected from the group consisting of alkyl substituted acrylic acid copolymers, TEA stearate salts, alkali neutralized mono- and di- alkyl phosphates including diethanolamine mono- and di- cetyl phosphate and hydroxy cetyl phosphate and mixtures thereof; (c) from about 1% to about 60% of a wax component having a required HLB of from about 1 to about 10 comprising: (i) an ester wax; and (ii) a wax selected from the group consisting of diester waxes and triglyceride waxes and mixtures thereof; and (d) a safe and effective amount of a topical carrier.

Claim 3

A sunscreen composition according to Claim 1 wherein said ester wax is selected from the group consisting of C₁₀-C₄₀ alcohols esterfied with C₁₀-C₄₀ fatty acid, diesters of C₁₀-C₄₀ fatty acid where the alcohol is propylene glycol, ethylene glycol or gly­cerin, polyethylene glycol, polypropylene glycol, polyglycerin, triglycerides or diglycerides of C₁₀-C₄₀ fatty acid, pentaerythi­tol tri- or tetra- esters of C₁₀-C₄₀ fatty acids, C₁₀-C₄₀ fatty acids of sorbitan triesters, C₁₀-C₄₀ fatty acids of sucrose polyesters having 3-8 moles of substitution, myrlstyl myristate, paraffin, synthetic waxes such as Fischer-Tropsche waxes, micro­crystalline waxes, castor wax, partially hydrogenated vegetable oils, behenyl behenrate and myristyl propionate and mixtures thereof.

Claim 4

A sunscreen composition according to Claim 2 wherein said wax component has a required HLB of from about 1 to about 8 and wherein the ratio of (i) to (ii) ranges from about 5:1 to about 1:1.

Claim 5

A sunscreen composition according to Claim 3 wherein said diester wax is selected from the group consisting of Synchrowax ERL-C and propylene glycol diester waxes and mixtures thereof.

Claim 6

A sunscreen composition according to Claim 4 wherein said wax component is present at a level of from about 5% to about 35% and wherein said emulsifier is present at a level of from about 0.05% to about 5% and is selected from the group consisting of alkyl substituted acrylic acid copolymers comprising from about 0.025% to about 0.75% of a carboxylic copolymer comprising polymers of a monomeric mixture containing 95.9 to 98.8 weight percent of an olefinically unsaturated carboxylic monomer selected from the group consisting of acrylic, methacrylic and ethacrylic acids, about 1 to about 3.5 weight percent of an acrylate ester of the formula wherein R is an alkyl radical containing 10 to 30 carbon atoms and R₁ is hydrogen, methyl, or ethyl, and 0.1 to 0.6 weight percent of a polymerizable cross-linking polyalkenyl polyether of a polyhydric alcohol containing more than one alkenyl ether group per molecule wherein the parent polyhydric alcohol contains at least 3 carbon atoms and at least 3 hydroxyl groups.

Claim 7

A sunscreen composition according to Claim 5 wherein said trigly­ceride wax is selected from the group consisting of Shea Butter, Cocoa Butter, Synchrowax HGL-C, Synchrowax HRC, Synchrowax HRS-C, tristearin, trimyristate and fully hydrogenated vegetable oils and mixtures thereof.

Claim 8

A sunscreen composition according to Claim 6 wherein said sun­screen active is selected from the group consisting of 2-ethyl­hexyl p-methoxycinnamate, butylmethoxydibenzoylmethane, 2-hy­droxy-4-methoxybenzophenone, 2,2′ dihydroxy-4-methoxybenzophenone and ethyl hexyl salicylate, octyldimethyl p-aminobenzoic acid, the 4-N,N-(2-ethylhexyl)methylaminobenzoic acid ester of 2,4-­dihydroxybenzophenone, the N,N-di-(ethylhexyl)-4-aminobenzoic acid ester of 4-hydroxydibenzoylmethane, the 4-N,N-(2-ethyl­hexyl)methylaminobenzoic acid ester of 4-hydroxydibenzoylmethane, the 4-N,N-(2-ethylhexyl)methylaminobenzoic acid ester of 2-hy­droxy-4-(2-hydroxyethoxy) benzophenone, the 4-N,N-(2-ethylhexyl)­methylaminobenzoic acid ester of 4-(2-hydroxyethoxy) dibenzoyl­methane, the N-N-di-(2-ethylhexyl)-4-aminobenzoic acid ester of 2-hydroxy-4-(2-hydroxyethoxy)benzophenone, or the N.N-di-(2-­ethylhexyl)-4-aminobenzoic acid ester of 4-(2-hydroxyethoxy)di­benzoylmethane and mixtures thereof.

Claim 9

A sunscreen composition according to Claim 5 wherein said sun­screen active is selected from the group consisting of 2-ethyl­hexyl p-methoxycinnamate, butylmethoxydibenzoylmethane, 2-hydroxy 4-methoxybenzophenone, octyldimethyl p-aminobenzoic acid and mixtures thereof.

Claim 10

A sunscreen composition according to Claim 8 which further comprises from about 10% to about 50% of an emollient.

Claim 11

A sunscreen composition according to Claim 9 wherein said emol­lient is selected from the group consisting of petrolatum, lanolin, tocopheryl acetate, USP light mineral oil, USP heavy mineral oil, isohexadecane, isodecyl neopentanoate, and mixtures thereof.

Claim 12

A sunscreen composition according to Claim 10 which further comprises from about 0.01 to about 15% of an emulsifier.

Claim 13

A method for protecting the skin of humans or lower animals from the effects of ultraviolet radiation, said method comprising topically applying to the skin of the human or lower animal an effective coating of a sunscreen composition according to Claim 1.

Claim 14

A method for protecting the skin of humans or lower animals from the effects of ultraviolet radiation, said method comprising topically applying to the skin of the human or lower animal an effective coating of a sunscreen composition according to Claim 2.

Claim 15

A method for protecting the skin of humans or lower animals from the effects of ultraviolet radiation, said method comprising topically applying to the skin of the human or lower animal an effective coating of a sunscreen composition according to Claim 3.

Claim 16

A method for protecting the skin of humans or lower animals from the effects of ultraviolet radiation, said method comprising topically applying to the skin of the human or lower animal an effective coating of a sunscreen composition according to Claim 5.

Claim 17

A method for protecting the skin of humans or lower animals from the effects of ultraviolet radiation, said method comprising topically applying to the skin of the human or lower animal an effective coating of a sunscreen composition according to Claim 6.

Claim 18

A method for protecting the skin of humans or lower animals from the effects of ultraviolet radiation, said method comprising toplcally applying to the skin of the human or lower animal an effective coating of a sunscreen composition according to Claim 7.

Claim 19

A method for protecting the skin of humans or lower animals from the effects of ultraviolet radiation, said method comprising topically applying to the skin of the human or lower animal an effective coating of a sunscreen composition according to Claim 9.