Production of polyoxymethylene and suitable catalysts
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United States of America Patent
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Sep 26, 2006
Grant Date -
Aug 11, 2005
app pub date -
Apr 10, 2003
filing date -
Apr 11, 2002
priority date (Note) -
Expired
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Abstract
A process is described for preparing polyoxymethylene by contacting a formaldehyde source with a catalyst of the formula I [ML.sup.1.sub.aL.sup.2.sub.b].sub.c.sup.m+Z.sub.cm/n.sup.n- (I) where M is a metal of group VIII; L.sup.1 is a ligand having at least one .pi.-electron pair; each L.sup.2 is independently tetrahydrofuran or a ligand which is displaceable by tetrahydrofuran; Z is an anion; a is 1 or 2; b is an integer from 0 to 4; c is 1 or 2; and m and n are integers from 1 to 4.
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