Method of making siloxane compositions

Details Method of making siloxane compositions Method of making siloxane compositions

1992-03-02

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...

524267, 524268, 528 14, 528 16, 528 18, 528 19, 528 21, 528 23, C08K 524

Patent

active

052101290

ABSTRACT:
A method of making a dispersion of a high viscosity siloxane in a volatile, especially cyclic siloxane, comprises first dispersing organopolysiloxanes having at least 2 Si--OR groups, wherein R is H or alkyl in a volatile siloxane and adding a catalyst which is either a phosphonitrile halide having the general formula [X(PX.sub.2 .dbd.N).sub.n PX.sub.3 ].sup.+ [MX.sub.(v-t+1) R.sub.t ].sup.-, or a heterogeneous catalyst selected from Li, Mg, Ca, Sr or Ba hydroxide, Na or K borate or phosphate, Rb or Cs carbonate or carboxylates of Rb or Cs wherein M is an element having an electronegativity of from 1.0 to 2.0, R is alkyl, X is halide, n is 1 to 6, v is the valence of M and t is from 0 to (v-1).

REFERENCES:
patent: 4429062 (1984-01-01), Pasztor et al.
patent: 4661556 (1987-04-01), Huebner et al.
patent: 4725643 (1988-02-01), Burkhardt
patent: 5073618 (1991-12-01), Westall
patent: 5109093 (1992-04-01), Rees et al.
patent: 5109094 (1992-04-01), Rees et al.

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