Method for obtaining photostable sunscreen compositions
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United States of America Patent
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Aug 20, 2002
Grant Date -
N/A
app pub date -
May 24, 2000
filing date -
May 25, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to a method for obtaining improved photostability of a sunscreen composition that contains at least two sunscreen active ingredients, which are photo-unstable when formulated together, by microencapsulating at least one of said active ingredients in an encapsulating material suitable for holding the encapsulated active ingredient material, thus reducing or preventing its leaching out of the capsules; and adding other acceptable components and additives needed for the preparation of said composition. The sunscreen active ingredients can be selected from UVA and UVB absorbers, preferably a combination thereof. In a preferred embodiment of the present invention said active ingredients are encapsulated in separate sol-gel microcapsules.
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