| 摘要 |
A process for preparing organopolysiloxane resins containing Si-bonded vinyl groups which comprises heating to a temperature of from about 85 DEG to 95 DEG C. a mixture containing (A) an organopolysiloxane having at least 0.1 percent by weight of Si-bonded hydroxyl groups and at least 50 mol percent of monoorganosiloxane units (RSiO3/2), (B) an organosiloxane containing from 2 to 10 silicon atoms per molecule, in which substantially all the silicon valences which are not satisfied by siloxane oxygen atoms, are satisfied by SiC-bonded hydrocarbon radicals, and having on the average at least two such hydrocarbon radicals for each silicon atom and at least one of the siloxanes (A) and/or (B) has an average of at least one SiC-bonded vinyl group, and (C) an acid activated bleaching clay; wherein the water released during the heating step by the condensation of Si-bonded hydroxyl groups is retained in the reactive mixture. |
