Method for the preparation of an organopolysiloxane

Details Method for the preparation of an organopolysiloxane Method for the preparation of an organopolysiloxane

1988-06-02

1989-08-08

Marquis, Melvyn I.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From silicon reactant having at least one...

528 21, 528 39, 556450, 556453, 556462, C08G 7706

Patent

active

048553816

ABSTRACT:
An organopolysiloxane composed of tetrafuctional siloxane units SiO.sub.2 and monofunctional siloxane units R.sub.3 SiO.sub.0.5 can be prepared by reacting an alkyl orthosilicate, e.g., ethyl silicate, or a partial hydrolysis product thereof and an oligomeric organopolysiloxane containing the monofunctional siloxane units in the presence of a catalytic compound which is, different from conventional hydrogen chloride, selected from the group consisting of sulfonic acid group-containing compounds, e.g., sulfuric acid and p-toluene sulfonic acid, and phosphonitrile chloride. In particular, cation exchange resins of sulfonic acid type and fluorinated polysulfonic acid resins can be used as the catalyst in a continuous process in which the reaction mixture is passed through a bed of the catalyst continuously. The inventive method is advantageous over conventional methods because of the absence of the problems of heavy corrosion of the apparatuses and waste disposal due to the hydrogen chloride.

REFERENCES:
patent: 4460726 (1984-07-01), Huber et al.
patent: 4608412 (1986-08-01), Freiberg
patent: 4774310 (1988-09-01), Butler

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