Patent ID: 8110613

Claim:
A method for producing a silicon compound (C), comprising a first process in which a silicon compound (A) represented by the following general formula (1) and a silicon compound (B) represented by the following general formula (2) are separately subjected to an alcohol exchange reaction in 1-propanol, and a second process in which hydrolytic copolycondensation is conducted under an alkaline condition, at a ratio of 0.3 to 2.8 mol of said silicon compound (A) based on 1 mol of said silicon compound (B) SiX 4 (1) wherein the formula (1), X is a siloxane bond-forming group, and Xs may be the same or different from each other wherein the formula (2), R 0 is an organic group having an oxetanyl group, R is an alkyl group having 1 to 6 carbon atoms, an aralkyl group having 7 to 10 carbon atoms, an aryl group having 6 to 10 carbon atoms, or an organic group having an oxetanyl group, Y is a hydrolyzable group, Ys may be the same or different from each other, and n is 0 or 1.