| abstract |
(57) 【Abstract】 PROBLEM TO BE SOLVED: As a hard coat agent component applied to the surface of a plastic lens, or as a flame retardant aid for various resins, fibers, Provided is a sol used for applications such as a flame retardant treatment agent for paper, a microfiller for absorbing ultraviolet rays, and a microfiller for emitting far infrared rays. SOLUTION: A particle (A) made of an oxide of a metal having a valence of 3, 4, or 5 is used as a nucleus, and the surface of the particle is represented by the general formula xZnO.ySnO 2 .zH 2 O where x: y: z. Having a primary particle diameter of 4.5 to 100 nm coated with particles (B) of zinc stannate hydrate represented by a molar ratio of 1: 0.83 to 1.43: 1.00 to 5.00 A sol in which particles of a modified metal oxide having the above are dispersed in a liquid medium. |