Silicone polymer termination

Details Silicone polymer termination Silicone polymer termination

1987-07-10

1988-08-23

Marquis, Melvyn I.

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

Synthetic resins

From silicon reactant having at least one...

528 22, 528 23, 528 37, C08G 7706

Patent

active

047661917

ABSTRACT:
Polydiorganosiloxane gum, of the type produced by the alkaline metal catalyzed polymerization of organocyclosiloxanes can be reduced in hydroxyl content by mixing the gum with an acid or acid producing phosphoric component and a silylamine component, allowing the mixture to react until the hydroxyl groups are lowered to the desired extent, then devolatilizing the gum. The hydroxyl content can be lowered without causing any significant change in the molecular weight of the gum. The hydroxyl content can be lowered to essentially zero.

REFERENCES:
patent: 2739952 (1956-03-01), Linville
patent: 3153007 (1964-10-01), Boot
patent: 4250290 (1981-02-01), Petersen
patent: 4439592 (1984-03-01), Maass et al.
patent: 4551515 (1985-11-01), Herberg et al.

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