Patent ID: 8859099

Claim:
An organosiloxane resin composition comprising: (E) colloidal silica, (F) a hydrolysis condensate of an alkoxysilane represented by the following formula (F): R 1 m R 2 n Si(OR 3 ) 4-m-n (F) wherein R 1 and R 2 are each independently an alkyl group having 1 to 4 carbon atoms, R 3 is an alkyl group having 1 to 4 carbon atoms, and m and n are each independently an integer of 0, 1 or 2, and (m+n) is an integer of 0, 1 or 2; and (G) at least one metal oxide selected from the group consisting of titanium oxide, zinc oxide and cerium oxide, all of which are dissolved and/or dispersed in a solvent, wherein (i) a content of the component (E) is 10 to 60 wt % and a content of the component (F) is 40 to 90 wt % based on 100 wt % of a total of the components (E) and (F) when a weight of the component (F) is a weight in terms of R 1 m R 2 n SiO (4-m-n)/2 , and an amount of the component (G) is 0.2 to 5.0 parts by weight based on 100 parts by weight of the total of the components (E) and (F), (ii) when a cumulative 50% particle diameter and cumulative 90% particle diameter in a laser diffraction particle size distribution measurement of the component (G) are represented by D50 and D90, respectively, D90 is 100 nm or less and D90/D50 is 20 or less, and (iii) wherein the component (G) is obtained by dispersing a slurry containing the metal oxide dispersed in water or an organic solvent with a medium mill filled with a medium having an average particle diameter of 100 μm or less.