Neutralization of alkali metal catalysts in organopolysiloxanes

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

1983-09-08

1986-11-25

Marquis, Melvyn I.

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

Synthetic resins

From silicon reactant having at least one...

556462, 528 18, 528 32, 528 33, 528 37, C08G 7706

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active

046250115

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 organopolysiloxane. 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.sup.+ can be easily obtained.

REFERENCES:
patent: 2571533 (1951-10-01), Britton et al.
patent: 3453304 (1969-07-01), Selin
patent: 3694405 (1972-09-01), Litteral
patent: 3903047 (1975-09-01), Ashby
patent: 3939195 (1976-02-01), Lucking et al.

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