Method of polymerizing oligomers of polydiorganosiloxane in the

Details Method of polymerizing oligomers of polydiorganosiloxane in the Method of polymerizing oligomers of polydiorganosiloxane in the

1983-03-14

1984-05-15

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...

525478, 524862, 524863, 524865, 524588, 524493, 528 15, 528 31, 528 32, 528 23, C08L 8304

Patent

active

044489277

ABSTRACT:
Oligomers of low molecular weight polydiorganosiloxanes, polydiorganocyclosiloxanes, or mixtures are polymerized in the presence of acidic or neutral reinforcing fillers. Trifluoromethane sulfonic acid is used as the polymerization catalyst. The method can also include endblocked polydiorganosiloxane to control the molecular weight of the silicone polymer in the silicone polymer-filler produced. The method combines the oligomer and filler, heats to from about 70.degree. to 150.degree. C., adds catalyst, adjusts temperature, and polymerizes the mixture, then inactivates with a Lewis base such as calcined magnesium oxide. The non-crepeing silicone polymer-filler mixture which is the product of the method is usable as electrical insulation grease, or as a reinforced polymer mixture useful in producing silicone elastomers. The mixture can be mixed with curing agents to produce heat curable and moisture curable elastomeric compositions.

REFERENCES:
patent: 3447988 (1969-11-01), Ostrozynski

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