Sunscreen compositions containing an ultraviolet radiation-absorbing polymer
View Patent ↗Compositions including a discontinuous oil phase homogeneously dispersed in a continuous water phase, the oil phase including a sunscreen agent that includes a linear, ultraviolet radiation absorbing polyether that comprises a chemically bound UV-chromophore; and an oil-in water emulsifier component including an anionic oil-in-water emulsifier and a nonionic oil-in-water emulsifier having an alcohol functional group, wherein the weight ratio of the anionic oil-in-water emulsifier to the nonionic oil-in-water emulsifier is about 12 or less and wherein the linear, ultraviolet radiation absorbing polyether is present in an amount effective to provide the composition with an SPF of about 10 or greater.
1. A composition, comprising:
a continuous water phase,
a discontinuous oil phase homogeneously distributed in said water phase, said oil phase comprising a polymer composition, said polymer composition comprising a sunscreen agent comprising a linear, ultraviolet radiation absorbing polyether that comprises a covalently bound UV-chromophore and that comprises a backbone having glyceryl repeat units; and wherein said linear, ultraviolet radiation absorbing polyether is present in an amount effective to provide said composition with an SPF of about 10 or greater; and
an oil-in-water emulsifier component comprising an anionic oil-in-water emulsifier and a nonionic oil-in-water emulsifier having an alcohol functional group, wherein the weight ratio of the anionic oil-in-water emulsifier to the nonionic oil-in-water emulsifier is about 12 or less.
2. The composition of claim 1 comprising about 5% to about 50% by weight of said linear, ultraviolet radiation absorbing polyether.
3. The composition of claim 1 , wherein said polymer composition consists essentially of said linear, ultraviolet radiation absorbing polyether.
4. The composition of claim 1 comprising about 7% to about 40% by weight of said linear, ultraviolet radiation absorbing polyether.
5. The composition of claim 1 comprising about 10% to about 25% of said linear, ultraviolet radiation absorbing polyether.
6. The composition of claim 1 , wherein said composition is substantially free of a non-polymeric UV-absorbing sunscreen agent.
7. The composition of claim 6 wherein said composition is substantially free of a polymeric sunscreen agent other than said linear, ultraviolet radiation absorbing polyether.
8. The composition of claim 1 comprising about 3% to about 8% by weight of said anionic oil-in-water emulsifier.
9. The composition of claim 1 comprising about 4.5% to about 8% by weight of said anionic oil-in-water emulsifier.
10. The composition of claim 7 , wherein said anionic oil-in-water emulsifier component comprises potassium cetyl phosphate.
11. The composition of claim 1 , wherein said anionic oil-in-water emulsifier is selected from the group consisting of alkyl, aryl or alkylaryl, or acyl-modified versions of sulfates, ether sulfates, monoglyceryl ether sulfates, sulfonates, sulfosuccinates, ether sulfosuccinates, sulfosuccinamates, amidosulfosuccinates, carboxylates, amidoethercarboxylates, succinates, sarcosinates, amino acids, taurates, sulfoacetates and phosphates.
12. The composition of claim 1 wherein said anionic oil-in-water emulsifier component comprises a phosphate ester.
13. The composition of claim 1 , wherein said nonionic oil-in-water emulsifier is a fatty alcohol having from 14 to about 22 carbon atoms.
14. The composition of claim 1 , wherein said oil-in-water emulsifier component is essentially free of cationic emulsifiers.
15. The composition of claim 1 , wherein the ratio of said anionic emulsifier to said non-ionic emulsifier is about 0.5 to about 12.
16. The composition of claim 1 having an SPF of about 20 or greater.
17. The composition of claim 1 , wherein said linear ultraviolet radiation absorbing polyether comprises a repeat unit selected from the group consisting of
where Y is said covalently bound UV-chromophore.
18. The composition of claim 1 , wherein said linear ultraviolet radiation absorbing polyether is characterized as having the structure:
where R is a pendant group, Y represents said chemically bound UV-chromophore, X is a terminal group, and m and n are real numbers between 0 and 1.
19. The composition of claim 18 , wherein m is 1 and n is 0.
20. The composition of claim 19 , wherein X and R independently are selected from the group consisting of hydrogen, linear alkyl, alkenyl or alkynyl hydrocarbon chains, and linear siloxanes.
21. The composition of claim 1 , wherein said UV-chromophore is selected from the group consisting of triazoles, camphors, dibenzoylmethanes, 4-aminobenzoic acid and alkane esters thereof, anthranilic acid and alkane esters thereof, salicylic acid and alkane esters thereof, hydroxycinnamic acid and alkane esters thereof, dihydroxy-, dicarboxy-, and hydroxycarboxybenzophenones and alkane ester or acid halide derivatives thereof, dihydroxy-, dicarboxy-, and hydroxycarboxychalcones and alkane ester or acid halide derivatives thereof, dihydroxy-, dicarboxy-, and hydroxycarboxycoumarins and alkane ester or acid halide derivatives thereof, benzalmalonate, benzimidazole derivatives, benzoxazole derivatives, 3-(3-(2H-benzo[d][1,2,3]triazol-2-yl)-5-(tert-butyl)-4-hydroxyphenyl), 6-octyl-2-(4-(4,6-di([1,1′-biphenyl]-4-yl)-1,3,5-triazin-2-yl)-3-hydroxyphenoxy)propanoate and trioctyl 2,2′,2″-(((1,3,5-triazine-2,4,6-triyl) tris(3-hydroxybenzene-4,1-diyl))tris(oxy)) tripropanoate.
22. The composition of claim 1 , wherein said UV-chromophore is selected from the group consisting of a benzotriazole and a triazine.
23. The composition of claim 1 , wherein said linear ultraviolet radiation absorbing polyether has a weight average molecular weight in the range of about 1000 to about 20,000.
24. The composition of claim 1 , wherein said polymer composition has a polydispersity index of about 1.5 or less.
25. The composition of claim 1 , wherein said polymer composition comprises about 50% or more of said linear ultraviolet radiation absorbing polyether.
26. The composition of claim 1 , wherein said polymer composition comprises about 95% or more of said linear ultraviolet radiation absorbing polyether.