| abstract |
Process for the preparation of organopolysiloxane resin, characterized in that in a 1st stage at least one silane of the formula R a Si (OR¹) 4-a (I), where a, R and R¹ have the meaning given in claim 1, and / or its partial hydrolyzate, with the proviso that at least one silane of the formula (I) with a equal to 0 or 1 and / or its partial hydrolyzate is used, and optionally organo (poly) siloxane is reacted with water in the presence of polyprotonic acid and optionally further substances, then the acid is partially neutralized by adding base and then the resulting compound R 1 OH is at least partially distilled off, possibly in a second stage the homogeneous reaction mass obtained in the 1st stage is reacted in the presence of base and water-insoluble organic solvent and water and compound R 1 OH are distilled off, possibly in a third stage the homogeneous reaction mass obtained in the second stage is adjusted to a pH between 6 and 8 by buffering with polyprotonic acid and / or its salts, water and any compound R¹OH which is still present is distilled off and the precipitated salt is filtered off and if necessary in a 4th stage the homogeneous reaction mass obtained in the 3rd stage is freed from water-insoluble organic solvent. |