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 37, 525477, C08G 7706

Patent

active

047661925

ABSTRACT:
Polydiorganosiloxane gum, of the type produced by the alkaline metal catalyzed polymerization of organocyclosiloxanes can be produced without hydroxyl content by mixing the gum with and acid or acid producing phosphoric component and a silylamide component, allowing the mixture to react until the hydroxyl groups are eliminated, then devolatilizing the gum. The hydroxyl content can be removed without causing any significant change in the molecular weight of the gum and producing a gum which is heat stable at temperatures such as 250.degree. C. without the addition of heat stabilizers.

REFERENCES:
patent: 2739952 (1956-03-01), Linville
patent: 3153007 (1964-10-01), Boot
patent: 4250290 (1981-02-01), Petersen
patent: 4341888 (1982-07-01), Razzano
patent: 4439592 (1984-03-01), Maass, et al.
patent: 4551515 (1985-11-01), Herberg et al.
patent: 4625011 (1986-11-01), Kosal et al.
patent: 4683277 (1987-07-01), Maxson

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