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US 10,851,208 B2Granted
Method for producing SiOH-functional polysiloxanes
AssigneeWacker Chemie AG
InventorsGeorg Loessel, Manfred Meisenberger
Life of this patent
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Abstract
High hydroxyl-content organopolysiloxanes of low molecular weight are prepared in a continuous process by metering in alkoxysilanes and chlorosilanes in a weight proportion of 60:40 or more to a reaction mixture containing water and non-polar solvent, and continuously removing an organic phase containing organopolysiloxanes from the reaction mixture.
Claims7
A continuous process for producing organopolysiloxanes having an OH content of 3.0-10.0% by weight, comprising:
- continuously metering alkoxysilanes in a proportion by weight of at least 60% and chlorosilanes in a proportion by weight of at most 40%, based on the sum total of chlorosilanes and alkoxysilanes;
- water;
- and non-polar solvent, soluble to an extent of not more than 1 g in 1 l of water at 20° C. and 1 bar, to a reaction mixture, reacting to form an organopolysiloxane having an OH content of 3.0 to 10.0 wt. %, and continuously discharging the reaction mixture.
Dependencies are inferred from the claim text.