Method of reducing activity of silicone polymers

Details Method of reducing activity of silicone polymers Method of reducing activity of silicone polymers

1986-10-27

1987-11-03

Marquis, Melvyn I.

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

Synthetic resins

From silicon reactant having at least one...

556464, 556466, 528 32, 528 37, C08G 7704

Patent

active

047044438

ABSTRACT:
A method of reducing the reaction between polydiorganosiloxane gum and reinforcing silica, which causes "creping", has been discovered. The method mixes crude polydiorganocyclosiloxane with a carbonate or bicarbonate salt of potassium or cesium, heats the mixture, then filters to remove the salt. The treated material can be further purified by stripping this filtered material to give a polydiorganocyclosiloxane having a hydroxyl content of less than 1 part per million of polydiorganocyclosiloxane.

REFERENCES:
patent: 2709692 (1955-05-01), Gainer
patent: 2744923 (1956-05-01), Duane
patent: 3978104 (1976-08-01), Razzano
patent: 4122247 (1978-10-01), Evans
patent: 4157337 (1979-06-01), Evans

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