Process for the preparation of methylpolysiloxanes

Details Process for the preparation of methylpolysiloxanes Process for the preparation of methylpolysiloxanes

C - Chemistry, Metallurgy

08

G

C08G 77/06 (2006.01) C08G 77/10 (2006.01) C08G 77/38 (2006.01) C08J 11/18 (2006.01)

Patent

CA 2100685

PROCESS FOR THE PREPARATION OF METHYLPOLYSILOXANES Abstract of the Disclosure A process for preparing methylpolysiloxanes by reacting organo- polysiloxanes (A), consisting of units of the formula Ra(CH3)b(R1O)cSiO(4-a-b-c)/2 (I) in which R is a hydrogen atom, an aromatic hydrocarbon radical, a substituted aromatic hydrocarbon radical, an aliphatically unsatur- ated radical or a substituted aliphatically unsaturated radical, R1 is a hydrogen atom or an alkyl radical, a is 0, 1, 2 or 3, b is 0, 1, 2 or 3, and c is 0 or 1, with the proviso that the sum a+b+c is less than or equal to 3, with hexamethyldisiloxane in the presence of concentrated sulfuric acid and an aluminum-containing silicate.

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