申请人:Takeda Mitsuo
公开号:US20070154561A1
公开(公告)日:2007-07-05
An object of the present invention is to provide a metal oxide particle which exercises more excellent ultraviolet absorbency as a matter of course and combines therewith merits of, for example, either being shifted in ultraviolet absorption edge toward the longer wavelength side and being excellent also in the absorption efficiency of a long-wavelength range of ultraviolet rays, or having good transparency and, for example, even in cases where added into or coated onto substrates, not damaging the transparency or hue of the substrates. As a means of achieving this object, a metal oxide particle according to the present invention is a metal oxide particle such that a hetero-element is contained in a particle comprising an oxide of a specific metal element (M), wherein the metal oxide particle is: 1) a metal oxide particle in the form of a fine particle wherein the hetero-element is at least one specific metal element (M′); 2) a metal oxide particle wherein the hetero-element includes at least two specific metal elements (M′); 3) a metal oxide particle wherein: the hetero-element is a more specified metal element (M′) and at least a part thereof is 2 in valence; or the metal element (M) is a more specified metal element and the metal oxide particle is in a specific range in crystal grain diameter in the vertical direction to each of the (002) plane and the (100) plane; or 4) a metal oxide particle wherein: the hetero-element is at least one specific nonmetal element and an acyl group is contained in the particle; or the hetero-element includes at least two specific nonmetal elements; or the hetero-element is at least one specific nonmetal element and a component derived from a metal element (M′) other than the metal element (M) is contained in the particle.
本发明的目的是提供一种金属氧化物微粒,它自然具有更优异的紫外线吸收性能,并结合了例如向长波长侧移动紫外线吸收边缘且在紫外线长波长范围的吸收效率也极佳的优点,或者具有良好的透明性,例如,即使添加到或涂覆在基材上,也不会损害基材的透明性或色调。为实现这一目的,根据本发明的金属氧化物微粒是一种特定金属元素(M)的氧化物的微粒中包含异元素金属氧化物微粒,其中该金属氧化物微粒是:1)一种微粒形式的细小金属氧化物微粒,其中异元素至少是一种特定金属元素(M′);2)一种金属氧化物微粒,其中异元素包括至少两种特定金属元素(M′);3)一种金属氧化物微粒,其中:异元素是一种更特定的金属元素(M′)且至少其部分是二价的;或者金属元素(M)是一种更特定的金属元素,且金属氧化物微粒在垂直于(002)面和(100)面的晶体粒度直径在特定范围内;或者4)一种金属氧化物微粒,其中:异元素至少是一种特定非金属元素,且微粒中包含酰基;或者异元素包括至少两种特定非金属元素;或者异元素至少是一种特定非金属元素,且微粒中包含来自金属元素(M′)以外的金属元素的成分。