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    • 9. 发明授权
    • Ultraviolet-screening zinc oxide excellent in transparency and composition containing the same
    • 紫外线屏蔽的氧化锌透明度优良,组成相同
    • US06171580B2
    • 2001-01-09
    • US09341145
    • 1999-07-16
    • Tomoyuki KatsuyamaAsa Kimura
    • Tomoyuki KatsuyamaAsa Kimura
    • A61K742
    • B82Y30/00A61K8/27A61K2800/262A61K2800/413A61Q17/04B82Y5/00C01G9/02C01P2002/84C01P2004/03C01P2004/62C01P2004/64C01P2006/60C09C1/043
    • The present inventors conducted investigations in order to develop a metal oxide which enables effective UV-screening; i.e. which has excellent screening ability against ultraviolet rays, particularly against long-wavelength ultraviolet rays, as well as excellent visible-light transmission; and to provide a UV-screening composition that contains the metal oxide and can be applied to external use. As a result, the present inventors have found that zinc oxide produced by a particular method has a characteristic form; i.e., primary particles having an average particle diameter of 50-100 nm aggregate in a planer shape, and a ratio represented by lnT360nm/lnT400nm (Txnm: transmittance of transmitted light of X nm) of 10 or more, and exerts excellent screening effect against long-wavelength ultraviolet rays as well as excellent visible-light transmission. The present invention has been accomplished based on this finding. The zinc oxide of the present invention effectively exerts the above-described excellent characteristics; i.e. UV-screening effect and transparency, and can be applied to a composition for external use such as make-up cosmetics or sunscreen cosmetics.
    • 本发明人进行了研究以开发能够进行有效的UV-筛选的金属氧化物; 即对紫外线具有优异的筛选能力,特别是针对长波长紫外线,以及出色的可见光透射率; 并提供含有金属氧化物并可应用于外部使用的UV-筛选组合物。 结果,本发明人发现通过特定方法制备的氧化锌具有特征形式; 即平均粒径为50〜100nm的一次粒子的平面形状聚集体,以及由lnT360nm / lnT400nm(Txnm:Xnm的透射光的透过率)表示的比例为10以上,并且对于 长波长紫外线以及优异的可见光透射。 基于这一发现完成了本发明。 本发明的氧化锌有效地发挥上述优异特性; 即紫外线屏蔽效果和透明度,并且可以应用于外用组合物,例如化妆用化妆品或防晒化妆品。