Neutralization of alkali metal catalysts in organopolysiloxanes

Details Neutralization of alkali metal catalysts in organopolysiloxanes Neutralization of alkali metal catalysts in organopolysiloxanes

C - Chemistry, Metallurgy

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C08G 77/08 (2006.01) C08G 77/06 (2006.01) C08G 77/32 (2006.01) C08G 77/34 (2006.01)

Patent

CA 1218187

NEUTRALIZATION OF ALKALI METAL CATALYSTS IN ORGAMOPOLYSILOXANES ABSTRACT A process for the neutralization of the alkali metal catalyst in a polymerized organopolysiloxane, where the alkali metal content of the resulting organopolysiloxane is significantly reduced, is described. The process consists of neutralizing the alkali metal salt with a straight-chain carboxylic acid of general formula ZCOOH, where Z is a hydrocarbon group containing at least two carbon atoms, and thereafter filtering the organopoly- siloxane. The same ZCOOH carboxylic acids may be added to organopolysiloxanes which have previously been neutralized with either carbon dioxide or acetic acid in order to significantly reduce the alkali metal content of the organopolysiloxane after filtration. Organopolysiloxanes containing less than 0.5 ppm K+ can be easily obtained.

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