Polymerization catalyst and polymerization process
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United States of America Patent
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Sep 10, 2002
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N/A
app pub date -
Dec 9, 1999
filing date -
Dec 9, 1998
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Abstract
Siloxanes are polymerized by equilibration, condensation and/or ring-opening polymerization using a phosphazene base catalyst. A linear phosphazene base catalyst of the general formula ##STR1## wherein R denotes a C.sub.1-10 hydrocarbon or wherein two R groups on one N atom form with the N atom a heterocyclic group, X denotes an anion and n is from 1 to 10 is prepared by reacting a linear phosphonitrile halide compound with a secondary amine or a salt of a secondary amine or a metal amide thereof to form an aminated phosphazene material, followed by an ion exchange reaction replacing the anion with a nucleophile.
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