Process for preparing partially alkoxylated polysiloxane

Details Process for preparing partially alkoxylated polysiloxane Process for preparing partially alkoxylated polysiloxane

1992-01-17

1993-06-29

Shaver, Paul F.

Organic compounds -- part of the class 532-570 series

Organic compounds

Silicon containing

556458, C07F 718

Patent

active

052236366

ABSTRACT:
A partially alkoxylated polysiloxane is prepared by using a reactor kettle equipped with a reaction column and a reflux condenser, charging the kettle with a lower alkoxysilane where the kettle liquid is kept boiling, continuously feeding a halogenated lower alkylsilane into the kettle through the column top and continuously feeding a mixture of water and a monohydric alcohol into the kettle in controlled rates, completely alkoxylating the halogenosilane with the alcohol within the column to continuously yield an alkoxysilane, hydrolyzing the alkoxysilane, with the hydrogen halide by-produced during alkoxylation acting as a catalyst, and withdrawing a partially alkoxylated polysiloxane containing less than 5% by weight of the alcohol from the kettle.

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