Patent ID: 8829142

Claim:
A method for producing an organosilicon compound (C2), said method comprising: (I) subjecting a silicon compound (A2) represented by formula (5) SiX 2 4 (5), wherein: X 2 is a siloxane-bond forming group; and X 2 s are the same or different from each other; to alcohol exchange in 1-propanol to give a resultant composition, wherein said resultant composition contains at least two silicon compounds each having different numbers of n-propoxy groups, wherein an average number of said n-propoxy groups bonded to a silicon atom in said at least two silicon compounds is in the range of 1.2 to 3.8; (II) adding a silicon compound (B2) represented by formula (6) wherein: R 0 is an organic group having a methacryloyl group or an acryloyl group; R 0 s are the same or different from each other; R 1 is an organic group containing an alkyl group having 1 to 6 carbon atoms; an aralkyl group having 7 to 10 carbon atoms, or an aryl group having 6 to 10 carbon atoms; R 1 s are the same or different from each other; Y 2 is a hydrolyzable group; Y 2 s are the same or different from each other; and n is 0 or 1, to the resultant composition obtained by said subjecting (I); and (III) conducting a hydrolysis copolycondensation under an alkaline condition, wherein said silicon compound (A2) and said silicon compound (B2) are present so as to be in a ratio of 0.3 to 1.8 mol of said silicon compound (A2) to 1 mol of said silicon compound (B2).