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 containing a sunscreen agent that includes a polymer composition containing a linear, ultraviolet radiation absorbing polyether, the linear, ultraviolet radiation absorbing polyether including a chemically bound UV-chromophore; and an oil-in water emulsifier component including an anionic oil-in-water emulsifier in an amount such that the composition includes about 0.5 percent by weight to about 3 percent by weight of the anionic oil-in-water emulsifier.
1. A composition, comprising:
a continuous water phase,
a discontinuous oil phase homogeneously distributed in said water phase, said oil phase comprising a sunscreen agent comprising a polymer composition, said polymer composition comprising a linear, ultraviolet radiation absorbing polyether that comprises a covalently bound UV-chromophore and that comprises a backbone having glyceryl repeat units; and
an oil-in-water emulsifier component comprising an anionic oil-in-water emulsifier in an amount of about 0.5 percent to about 3 percent by weight of said composition.
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 0.6% to about 3.0% by weight of said anionic oil-in-water emulsifier.
9. The composition of claim 1 comprising about 0.6% to about 2.5% 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 oil-in-water emulsifier component is essentially free of non-ionic emulsifiers having an alcohol-functional group.
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 said oil-in-water emulsifier component consists essentially of said anionic emulsifier.
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.
27. The composition of claim 1 , 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.
28. The composition of claim 1 having a modified TEP value of 0.3 or less.