Enhanced photostability of avobenzone in the presence of zinc oxide using phosphate-based emulsifiers
AssigneeSchering-Plough Healthcare Products, Inc.
InventorsThomas A. Meyer, Donathan G. Beasley
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Abstract
The photostability of avobenzone in a sunscreen composition in the presence of zinc oxide is stabilized against photodegradation using phosphate-based emulsifiers.
Claims32
A composition comprising avobenzone, zinc oxide and phosphate-based emulsifier.
A method for protecting the skill against ultraviolet radiation, comprising applying to the skin an effective amount of a composition comprising avobenzone, zinc oxide and phosphate-based emulsifier, wherein the phosphate-based emulsifier is present in a sufficient amount to stabilize the avobenzone against photodegradation.
A method for improving the photostability of avobenzone in a composition including avobenzone and zinc oxide, the method comprising adding phosphate-based emulsifier to the composition in a sufficient amount to stabilize the avobenzone against photodegradation.
Dependencies are inferred from the claim text.