Process for preparation of organofunctional siloxanes

Details Process for preparation of organofunctional siloxanes Process for preparation of organofunctional siloxanes

1992-05-07

1993-03-16

Marquis, Melvyn I.

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

Synthetic resins

From silicon reactant having at least one...

528 32, 556467, C08G 7706

Patent

active

051945533

ABSTRACT:
The present invention is a process for the preparation of organofunctional-terminated polydiorganosiloxane polymers and organofunctional polydiorganosiloxane copolymers. The process comprises reacting a chlorine-terminated polydiorganosiloxane polymer with: (1) an organofunctional chlorosilane end-blocker to form an organofunctional terminated polydiorganosiloxane polymer and (2) a mixture of organochlorosilane end-blocker and organofunctional dichlorosilane to form an organofunctional polydiorganosiloxane copolymer. The process is conducted in the presence of an aqueous solution of hydrogen chloride, where the water is present in stoichiometric excess in relation to the hydrolyzable silicon-bonded chlorine.
The present process is particularly useful for producing 5-hexenyl-terminated polydimethylsiloxane polymers and for producing siloxane copolymers comprising randomly distributed poly-5-hexenylmethylsiloxy and polydimethylsiloxy blocks.

REFERENCES:
patent: 2421653 (1947-06-01), Sauer
patent: 2779776 (1957-01-01), Hyde

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