Preparation of organopolysiloxanes
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsKiyoyuki Mutoh, Yasuhito Mohara, Susumu Ueno
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Abstract
For the preparation of organopolysiloxanes, water glass diluted with water to a concentration of 3 to 15 wt % is reacted with a triorganohalosilane in the presence of an acid and an oxygen-containing solvent such as isobutyl alcohol, methyl isobutyl ketone or 1-pentanol. The invention achieves a considerable reduction of the environmental load, an improved utilization of reactants, an improved yield, and a cost reduction, and enables production of low viscosity MQ resins.
Claims3
A method for preparing an organopolysiloxane, comprising the step of reacting water glass diluted with water to a concentration of 3 to 15% by weight with a triorganohalosilane in the presence of an acid and an oxygen-containing solvent having a solubility of at least 1% by weight in water at room temperature, but not completely compatible with water, and having a boiling point of up to 220° C.
Dependencies are inferred from the claim text.