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Herbal Extracts and Sebum Control and Other Topics
By: Charles Fox, Independent Consultant
Posted: October 4, 2004, from the October 2004 issue of Cosmetics & Toiletries.
page 8 of 11
qs 100.00Interesting Vehicles
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 | |
| Urea | 5.00% |
| Lactic acid | 3.60 |
| Sodium lactate | 2.40 |
| Polyethylene glycol | 1.00 |
| Ethyl alcohol | 30.00 |
| Polysorbate 20 | 1.00 |
| Polysorbate 80 | 1.00 |
| dl-Alpha-tocopherol acetate | 0.10 |
| Fragrance (parfum) | 0.03 |
| Water (aqua) |
qs 100.00 |
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.
