Catalytic preparation of high molecular weight polysiloxanes

Details Catalytic preparation of high molecular weight polysiloxanes Catalytic preparation of high molecular weight polysiloxanes

1982-05-12

1984-01-17

Marquis, Melvyn I.

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

Synthetic resins

From silicon reactant having at least one...

528 16, 528 17, 528 18, 428403, 556462, C08G 7706

Patent

active

044265085

ABSTRACT:
Polysiloxanes of relatively low molecular weight are catalytically polymerized/rearranged into high molecular weight polysiloxanes in the presence of a cationic catalyst comprising a porous, inorganic mineral particulate support having an average pore diameter in excess of 20 .ANG. and a pore volume ranging from 0.2 to 2 ml/g, said porous support being coated with less than 15 mg/m.sup.2 of a film of polymeric material comprising pendant sulfonic or phosphonic acid functions, and said polymeric material being characterized by an ion exchange capacity of less than 2 milliequivalents per gram.

REFERENCES:
patent: 3222722 (1967-05-01), Eynon
patent: 4038213 (1977-07-01), McClure et al.
patent: 4222952 (1980-09-01), Vick

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