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By: Charles Fox, Independent Consultant
Posted: October 4, 2004, from the October 2004 issue of Cosmetics & Toiletries.
page 8 of 11qs 100.00
Urea and fat-soluble vitamins in liquid cosmetics: Kanebo Ltd. describes storage-stable transparent liquid cosmetics containing urea and fat-soluble vitamins.13 The transparent liquid cosmetics contain (A) urea, (B) fat-soluble vitamins selected from vitamin A, vitamin D, vitamin E, vitamin K, and/or their derivatives, (C) lactic acid, phosphoric acid, citric acid, edetic acid, and/or their salts, and (D) two or less kinds of nonionic surfactants having HLB >10. An example of a cosmetic lotion is shown in Formula 8.
|Formula 8. Storage-stable transparent liquid cosmetic13|
This product showed good transparency after 6-months storage at 0oC, and had a pH 5.2 and 5.7 before and after 6-months storage at 40oC. No ammonia odor was detected (through breakdown of urea) after 6-months storage at 40oC.