Condensation process for preparation of organofunctional siloxan

Details Condensation process for preparation of organofunctional siloxan Condensation process for preparation of organofunctional siloxan

1992-07-31

1994-05-31

Marquis, Melvyn I.

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

Synthetic resins

From silicon reactant having at least one...

556462, 556466, 556489, 528 34, C08G 7706

Patent

active

053170725

ABSTRACT:
The present invention is a process for the preparation of organofunctional-terminated polydiorganosiloxane polymers and organofunctional polydiorganosiloxane copolymers. The process comprises reacting a hydroxyl-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 can be 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 poly-5-hexenylmethylsiloxy and polydimethylsiloxy blocks.

REFERENCES:
patent: 2421653 (1947-06-01), Sauer
patent: 2779776 (1951-01-01), Hyde
patent: 3078255 (1963-02-01), Pike
patent: 3169942 (1965-02-01), Pike
patent: 4218359 (1980-08-01), Marwitz et al.

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