Method of forming siloxane polymers using a heteropoly catalyst

Details Method of forming siloxane polymers using a heteropoly catalyst Method of forming siloxane polymers using a heteropoly catalyst

1995-12-28

1997-03-04

Shaver, Paul F.

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

Organic compounds

Silicon containing

528 19, C07F 708

Patent

active

056080964

ABSTRACT:
The invention relates to a method of forming siloxane polymers using a heteropoly catalyst having a Keggin structure. The method comprises contacting a fluid comprising at least one siloxane polymer precursor selected from the group consisting of cyclic siloxanes (I) having the formula (RR'SiO).sub.a and linear siloxanes (II) having the formula ##STR1## where R is a substituted or unsubstituted monovalent hydrocarbon having from 1 to 6 carbon atoms, R' is hydrogen or a substituted or unsubstituted monovalent hydrocarbon having from 1 to 6 carbon atoms, a is at least 3 and b is at least 1; with an effective amount of a heteropoly catalyst having a Keggin structure, selected from the group consisting of heteropoly acids (III) having the formula H.sub.n XM.sub.12 O.sub.40, salts thereof and mixed acid-salts thereof, where X is B.sup.+3, Si.sup.+4, Ge .sup.+4, p.sup.+5, M is Mo.sup.+6 and n is 3, 4 or 5, as required for the valence of the heteropoly acid to equal 0, at a temperature ranging from about 23.degree. C. to the boiling point of the siloxane polymer precursor.

REFERENCES:
patent: 5173558 (1992-12-01), Hansen et al.
patent: 5354830 (1994-10-01), Williams
Misono, M. "Heterogeneous Catalysis by Heteropoly Compounds of Molybdenum and Tungsten", Catal. Rev.-Sci. Eng., 29(2&3), 269-321 (1987).
Chemistry & Technology of Silicones, [239] 5.4, pp. 209-233 (1968). (Noll).

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