Patent ID: 9644113
Date: 2017-05-09
CPC Classifications: C03C,C09D

Claim:
1. A low refractive index film-forming composition comprising a hydrolysate of a silicon alkoxide and a silica-sol, wherein the silica-sol comprises silica particles having an average particle size within a range of 37 nm to 50 nm, and wherein the composition is prepared by: (1) generating a hydrolysate of (A) a silicon alkoxide by: to form a hydrolysate of the silicon alkoxide, and (2) mixing the hydrolysate of the silicon alkoxide with (E) a silica sol, wherein the (E) silica sol is obtained by dispersing fumed silica particles having an average particle size within a range of 37 nm to 50 nm and a specific surface area (BET value) within a range of 50 m 2 /g to 400 m 2 /g in a liquid medium, and wherein the SiO 2 in the (E) silica sol is 1 part by mass to 99 parts by mass of the (E) silica sol when a proportion of SiO 2 in the hydrolysate is regarded as being 1 part by mass.