Method of making organopolysiloxanes

Details Method of making organopolysiloxanes Method of making organopolysiloxanes

1992-02-06

1993-05-11

Marquis, Melvyn I.

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

528 14, 528 15, 528 16, 528 17, 528 18, 528 19, 528 21, 528 23, C08L 8304

Patent

active

052101312

ABSTRACT:
A method of making organopolysiloxanes comprises contacting organosilicon compounds having at least one unit ##EQU1## wherein R.degree. is hydrogen, hydroxyl, a C.sub.1-18 hydrocarbon, substituted hydrocarbon or hydrocarbonoxy group and a has a value of from 0 to 4 with a phosphonitrile halide AB, wherein A is a phosphonitrile halide cation [X(PX.sub.2 .dbd.N).sub.n PX.sub.3 ].sup.+, wherein X is halide and n is from 1 to 8 and B is an anion derived from a Lewis acid not containing a P atom, e.g. [MX.sub.(v-t+1) R.sup.2 .sub.t ].sup.-. The method is particularly useful for condensation of silanol end-blocked siloxanes.

REFERENCES:
patent: 3449091 (1969-06-01), Nichols
patent: 3549680 (1970-12-01), Wegehaupt et al.
patent: 4902813 (1990-02-01), Wegehaupt et al.

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