Process for preparing water-in-oil type emulsion cosmetic composition containing L-ascorbic acid with improved stability
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United States of America Patent
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Feb 12, 2002
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N/A
app pub date -
Nov 4, 1999
filing date -
Dec 9, 1998
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Expired
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Abstract
Disclosed is a process for preparing water-in-oil type emulsion cosmetic compositions containing L-ascorbic acid. The use of 2-hydroxypropyl cyclodextrin and a water-in-oil type emulsion allow L-ascorbic acid itself to be preserved for a lengthy period of time with high functional maintenance. Even after being stored for a significant period of time, the water-in-oil type emulsion cosmetic compositions do not exhibit discoloration nor give out offensive odor nor show the separation of cosmetic ingredients. In addition, the cosmetic compositions keep L-ascorbic acid high in the effective whitening activity, such as melanin reduction and inhibitory activity against tyrosinase.
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