| abstract |
(57) [Abstract] [Objective] Method for producing organopolysiloxane resin [Constitution] In the first step, silane of the formula: R a Si (OR 1 ) 4-a (I) and / or its partial hydrate and, as the case may be, The organo (poly) siloxane is reacted with water in the presence of a polybasic acid and optionally other substances, followed by partial neutralization of the acid, then the resulting compound R 1 OH is at least partially distilled off, and in the second step, the first The homogeneous reaction product obtained in the step is reacted in the presence of a base and an organic solvent insoluble in water, the water and optionally the compound R 1 OH being distilled off, obtained in the third step in the second step. The homogeneous reaction product obtained is buffered with a polybasic acid and / or its salt to a pH value between 6 and 8, water and the compound R 1 OH are distilled off, the precipitated salt is filtered off, In the fourth step, the water-insoluble organic solvent is removed from the homogeneous reactant obtained in the third step. |