| 摘要 |
<p>A fine particle comprising a porous composite oxide particle comprised of silica and an inorganic oxide other than silica and, coated thereon, a silica-based inorganic oxide layer having a thickness of 0.5 to 20 nm. The fine particle preferably contains an organic group bonded directly to a silicon atom, and the ratio of the molar amount of the silicon having the organic group bonded thereto (SR) to the molar amount of the total silicon (ST), SR/ST, is preferably 0.001 to 0.9. A substrate having a coating thereon which comprises, formed thereon, a coating film comprising the above-mentioned fine particles and a matrix for forming a film is also provided. A variety of fine particles having a structure wherein a porous composite oxide particle is coated with a porous silica-based inorganic oxide layer are provided. The formation of a coating film comprising the fine particles on a surface of a substrate results in a substrate having a coating thereon which has a low refractive index and excellent in adhesion with a resin or the like, strength, the ability to reduce reflection and the like.</p> |
