Preparation of hydrocarbonoxy containing polysiloxanes

Details Preparation of hydrocarbonoxy containing polysiloxanes Preparation of hydrocarbonoxy containing polysiloxanes

1978-12-28

1980-06-24

Shaver, Paul F.

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

Organic compounds

Silicon containing

556458, C07F 704, C07F 718

Patent

active

042094542

ABSTRACT:
This invention relates to an improved process for preparing polysiloxanes having hydrocarbon radicals bonded to silicon atoms via oxygen, by reacting a halosilane with an alcohol and water in the presence of the desired polysiloxane, the improvement which comprises continuously introducing into a reactor equipped with a column and possibly a reflux condenser and the desired polysiloxane, an alcohol, water and, if necessary, an acid catalyst which promotes the condensation of Si-bonded condensable groups, in an amount such that the reactor contains at least 5 percent by weight of alcohol and 0.001 to 5 percent by weight of catalyst, based on the weight of the alcohol, catalyst and polysiloxane present in the reactor in which the contents of the reactor are heated to the reflux temperature and the halosilane is introduced into the column at least one meter above the bottom of the column while continuously removing the polysiloxane from the reactor at the same rate as it is formed.

REFERENCES:
patent: 3668180 (1972-06-01), Brennan et al.
patent: 4032557 (1977-06-01), Spork et al.

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