Polymerization of silicone polymer-filler mixtures as powders

Details Polymerization of silicone polymer-filler mixtures as powders Polymerization of silicone polymer-filler mixtures as powders

1983-03-14

1984-02-14

Marquis, Melvyn T.

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, 528 21, 528 23, C08L 8304

Patent

active

044317719

ABSTRACT:
A method of producing a silicone polymer-filler mixture in powder form has been developed. The method combines an oligomer consisting of a polydiorganosiloxane, sufficient acidic or neutral reinforcing filler to yield a powder, and a catalytic amount of a catalyst consisting of (a) sulfuric acid or a sulfonic acid of the formula XSO.sub.3 H wherein X is selected from the group consisting of halogen, alkyl, aryl, alkoxy and alkaryl radicals, (b) perfluorinated alkane sulfonic acid, and (c) a combination of quaternary ammonium carboxylate and carboxylic acid, to give a powdery mixture. The powdery mixture is polymerized, then the catalyst is inactivated while maintaining a powdery state. The method requires a minimum of energy for mixing.

REFERENCES:
patent: 2803617 (1957-08-01), Corrin
patent: 4101499 (1978-07-01), Herzig

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