PROBLEM TO BE SOLVED: To provide core-shell type zinc oxide fine particles or a dispersion containing the same, a method for producing them and their application.SOLUTION: The core-shell type zinc oxide fine particles have an average particle diameter of 50-1,000 nm, wherein the shape of a secondary particle of the core part is spherical and a polymer which is the shell adheres to its surface. There are also provided a dispersion of the zinc oxide fine particles and dry powder of the zinc oxide fine particle dispersion. The method for producing the core-shell type zinc oxide fine particles or the dispersion thereof includes a step of mixing a salt of zinc and a polymer in an organic solvent to prepare a mixture, and a step of subjecting the mixture to heating-reflux at a predetermined temperature to deposit core-shell type zinc oxide fine particles, wherein the salt of zinc is zinc acetate. There is also provided application to cosmetics, resins, fibers, etc., having ultraviolet screening action, which contain the core-shell type zinc oxide fine particles.COPYRIGHT: (C)2009,JPO&INPIT【課題】コアシェル型酸化亜鉛微粒子又はそれを含有する分散液、それらの製造方法及び用途を提供する。【解決手段】粒子径の平均が50~1000nmであるコアシェル型酸化亜鉛微粒子であって、コア部分の二次粒子の形状が球状であり、その表面にシェルである高分子が付着している、前記微粒子、該酸化亜鉛微粒子の分散液、該酸化亜鉛微粒子分散液の乾燥粉体、及び、亜鉛の塩と高分子を有機溶媒に混合して混合物を得る工程と、その混合物を所定の温度で加熱・還流してコアシェル型酸化亜鉛微粒子を析出する工程とを有する、コアシェル型酸化亜鉛微粒子又はその分散液の製造方法であって、前記亜鉛の塩が、酢酸亜鉛であるコアシェル型酸化亜鉛微粒子の製造方法、及び前記コアシェル型酸化亜鉛微粒子を含有する紫外線遮断作用を有する化粧品、樹脂、繊維などの用途。【選択図】図2
