External preparation for skin and beautifying agents
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- THE NISSHIN OILLIO GRP LTD
- Publication Date
- 2003-07-02
- Estimated Expiration
- Not applicable · inactive patent
Abstract
Description
technical field
[0001] The present invention relates to an external agent for skin, and more particularly, to an external agent for skin having a whitening effect and a whitening agent. Background of the invention
[0002] The activity of melanocytes is generally stimulated by, for example, exposure of the skin to UV rays (including sunlight), paraeccrisis of hormones and genetic factors, whereby abnormal deposition of melanin synthesized in melanocytes occurs in the skin Black skin, melasma and skin freckles. In order to alleviate or brighten and / or prevent such abnormal deposition of melanin, various whitening agents such as L-ascorbic acid or its derivatives, hydroquinone derivatives, glutathione and colloidal sulfur have been developed. However, many problems arise such that some of them have only a weak melanogenesis-inhibiting effect, are rather unstable and are easily oxidized, release a characteristic odor and form precipitates. Also, they do not have sufficient wh...