Nonhydrolyzable siloxane block copolymers of organosiloxanes and

Details Nonhydrolyzable siloxane block copolymers of organosiloxanes and Nonhydrolyzable siloxane block copolymers of organosiloxanes and

1978-03-28

1979-04-17

Shaver, Paul F.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2604482E, 521112, 521174, C09F 708

Patent

active

041500482

ABSTRACT:
Organic ethers including polyethers having two CH.sub.2 .dbd.C(R)CH.sub.2 -- end groups per molecule wherein R is a monovalent hydrocarbon group are reacted with organohydrosiloxanes under hydrosilation reaction conditions in the presence of a platinum catalyst preferably a neutral platinum catalyst, to form very useful nonhydrolyzable siloxane block copolymers. Novel nonhydrolyzable linear block copolymers substantially free of silicon-bonded hydrogen are obtained with linear dihydropolyorganosiloxane reactants and linear ethers or polyethers. The linear block copolymers made with the linear dihydrosiloxanes and polyethers are particularly useful as surfactants and foam stabilizers for the preparation of polyurethane foams. The very low degree (if any) of isomerization of the CH.sub.2 .dbd.C(R)CH.sub.2 -- group to unreactive species during the hydrosilation reaction results in the unexpectedly high molecular weight of the copolymers of the present invention.

REFERENCES:
patent: 3233986 (1966-02-01), Morehouse
patent: 3280160 (1966-10-01), Bailey
patent: 3381019 (1968-04-01), Morehouse
patent: 3414604 (1968-12-01), Pepe et al.
patent: 3842112 (1974-10-01), Omietanski et al.
patent: 3879433 (1975-04-01), Omietanski et al.
patent: 3957843 (1976-05-01), Bennett
patent: 4059605 (1977-11-01), Bennett

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