Polymerization of polydiorganosiloxane in the presence of filler

Details Polymerization of polydiorganosiloxane in the presence of filler Polymerization of polydiorganosiloxane in the presence of filler

1983-03-14

1984-02-21

Marquis, Melvyn I.

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524493, 524588, 524847, 524860, 524861, 524862, 524864, 524865, 524425, 524495, 524430, 524431, 524437, 524445, 524497, 528 23, 528 22, C08K 310

Patent

active

044330960

ABSTRACT:
A method of polymerizing hydroxyl-endblocked polydiorganosiloxane in the presence of filler, including acidic filler such as fumed silica, through the use of basic diorganosilanolates as catalysts is claimed. Preferred diorganosilanolates are tetra-n-butylphosphonium dimethylsilanolate and potassium dimethylsilanolate. The silicone polymer-filler mixture produced is useful in silicone greases and elastomers. Methods of combining the silicone polymer-filler mixture with various curing agents to yield curable compositions are claimed.

REFERENCES:
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patent: 2727876 (1955-12-01), Iler
patent: 2883366 (1959-04-01), Kantor et al.
patent: 3477988 (1969-11-01), Ostrozynski
patent: 3692737 (1972-09-01), Laur
patent: 4008261 (1977-02-01), Brown et al.
patent: 4101499 (1978-07-01), Herzig
patent: 4268452 (1981-05-01), Mine et al.

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