Method for decreasing content of alkoxy groups in alkoxy contain

Details Method for decreasing content of alkoxy groups in alkoxy contain Method for decreasing content of alkoxy groups in alkoxy contain

1991-12-13

1993-08-31

Bleutge, John C.

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

Synthetic resins

From silicon reactant having at least one...

528 21, 528 39, 556469, 556468, C08G 7708

Patent

active

052410331

ABSTRACT:
A novel and efficient method is disclosed for decreasing the content of residual alkoxy groups in an organopolysiloxane such as so-called MQ resins, usually and unavoidably, having a considerable amount of residual alkoxy groups bonded to the silicon atoms to be very detrimental against practical application of the organopolysiloxane. The method comprises admixing the alkoxy-containing organopolysiloxane with a strongly alkaline compound such as alkali metal hydroxides as a catalyst, an aprotic polar solvent such as N,N-dimethyl formamide, dimethyl sulfoxide and the like and water each in a specified amount and heating the mixture, for example, under reflux so that the alkoxy groups are rapidly hydrolyzed and can be removed in the form of an alcohol.

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Noll, Chemistry and Technology of Silicones 1968 pp. 226-229.
Lagowski, The Chemistry of Nonaqueous Solvents vol. 3 1970 pp. 12-17.

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