Patent ID: 8030429

Claim:
A method for producing an organopolysiloxane represented by the following average structural formula (II), characterized by subjecting a compound represented by the following average structural formula (I): R 1 a SiO [(4−a−b−c)/2] (OR 2 ) b (OH) c (I) wherein each of R 1 and R 2 independently represents a monovalent hydrocarbon group; 0≦a<4; 0<b<4; 0<c<4; and c≦b, with the proviso that 0<(a+b+c)<4, to a dealcoholization condensation reaction in the presence of a quaternary ammonium ion-containing catalyst to produce the organopolysiloxane represented by the following average structural formula (II): R 1 a SiO [(4−a−b+c)/2] (OR 2 ) b−c (II) wherein R 1 , R 2 , a, b and c are the same as described above, with the proviso that 0<(a+b−c)<4, and wherein the compound represented by said average structural formula (I) is obtained by hydrolyzing an alkoxysilane in the presence of an acid or a base, wherein the alkoxy silane is represented by the following general formula (III): R 1 a′ Si(OR 2 ) b′ (III) wherein R 1 and R 2 are the same as described above; a′ is 0, 1, 2 or 3; and b′ is 1, 2, 3 or 4, with the proviso that (a′+b′)=4, with the proviso that the alkoxy silane is not hydrolyzed in the presence of a quaternary ammonium ion-containing catalyst.