SILICA POROUS BODY, LAMINATE AND COMPOSITION FOR OPTICAL USE, AND METHOD FOR PRODUCING SILICA POROUS BODY

摘要

Disclosed is a silica porous body which has low refractive index and is stable against water. Specifically disclosed is a silica porous body having a refractive index of not more than 1.3. In this silica porous body, the difference of the refractive indexes before immersion in water and after immersion in water for 24 hours is not more than 0.15 at a wavelength of 550 nm.