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

C - Chemistry, Metallurgy

08

G

400/7219, 400/72

C08G 77/06 (2006.01) C08G 85/00 (2006.01) C08J 3/20 (2006.01) C08K 3/00 (2006.01) C08L 83/06 (2006.01)

Patent

CA 1246276

POLYMERIZATION OF SILICONE POLYMER-FILLER MIXTURES AS POWDERS Abstract A method of producing a silicone polymer-filler mixture in powder form has been developed The method combines an oligomer consisting of a polydiorgano- siloxane, 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 XSO3H 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.

446901

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