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US 8,524,203 B2Granted
Sunscreen composite particles for UVA and UVB protection
AssigneeConopco, Inc.
InventorJack Polonka
Life of this patent
Estimating the term…
Abstract
Sunscreen composite particles for UVA and UVB protection are described. The particles are substantially free of supplied UVB sunscreen and are prepared with a UVA sunscreen suitable to undergo keto-enol tautomerization.
Claims3
A composition for providing UVA and UVB protection, the composition comprising a cosmetically acceptable carrier, and a sunscreen composite particle comprising:
- a) an UVA sunscreen that can undergo keto-enol tautomerization, wherein said UVA sunscreen is 4-(1,1-dimethylethyl)-4′-methoxydibenzoylmethane;
- b) a condensation polymerizable resin selected from the group consisting of polyalkyleneoxypolyamide (PAOPA) resins wherein said polyalkyleneoxypolyamide resin is polyamide-3;
- and
- c) a solvent, the solvent being one in which the UVA sunscreen is soluble in and one having a dielectric constant from about 5.5 to about 9, wherein said solvent is butyl/isopropyl phthalimide,
- wherein the particle imparts UVA and UVB sunscreen protection and is substantially free of added UVB sunscreen.
2 more elements
Dependencies are inferred from the claim text.