Method for producing a polydiorganosiloxane having a pendent alk

Details Method for producing a polydiorganosiloxane having a pendent alk Method for producing a polydiorganosiloxane having a pendent alk

1988-09-08

1989-10-17

Shaver, Paul F.

Organic compounds -- part of the class 532-570 series

Organic compounds

Silicon containing

C07F 708

Patent

active

048748811

ABSTRACT:
Polydiorganosiloxanes which have a pendant alkenyl radical in the middle of the molecular chain are prepared by a nonequilibrium, living polymerization of cyclic trisiloxanes using an organopolysiloxane alkali metal salt of the formula ##STR1## where M is lithium, sodium, or potassium, which takes place under substantially anhydrous conditions, and the polymerization is terminated with an end-capping reaction to produce a polydiorganosiloxane of the formula ##STR2## where R.sup.1 is an alkenyl radical. These polymers can be used to make graft copolymers and can be made more functional when the ends are capped with functional groups.

REFERENCES:
patent: 3002951 (1961-10-01), Johannson
patent: 3146251 (1964-08-01), Brown et al.
patent: 3294740 (1966-12-01), McVannel
patent: 4075169 (1978-02-01), Razzano
patent: 4287353 (1981-09-01), Bluestein
patent: 4611042 (1986-09-01), Rivers-Farrell et al.
patent: 4792596 (1988-12-01), Ottlinger et al.
Macromolecules, vol. 3, No. 1, (1970), Author: J. Saam, pp. 1-4.

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