| abstract |
PURPOSE:To obtain a drug for external use, having improved adhesive properties to the skin, good finish and feeling of use and excellent ultraviolet ray absorptivity and useful as cosmetics, quasi-drugs, etc., by blending zinc oxide having a flaky particle shape with other ingredients. CONSTITUTION:The aimed substance obtained by blending flaky zinc oxide having 0.1-1mum average particle diameter, 0.01-0.2mum average particle thickness and >=3 average flatness ratio with a base of cosmetics, quasi-drugs, etc. The zinc oxide, as necessary, is subjected to water repellent treatment, such as silicone treatment. The amount of the blended zinc oxide is within the range of 0.1-50wt.%. The flaky zinc oxide contains zinc ions and further one or two or more acid groups in an amount exceeding equivalent as the total amount based on the zinc ions and is obtained by precipitation from a mother liquor at pH >=1. |