Catalyst systems for polycondensation reactions
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United States of America Patent
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Dec 7, 2004
Grant Date -
Nov 20, 2003
app pub date -
Oct 25, 2002
filing date -
Dec 10, 1999
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Abstract
The invention pertains to new catalyst systems for polycondensation reactions, for example for producing polyethylene terephthalate. In accordance with the invention, complex compounds with hydrotalcite-analogous structures of general formula [M(II).sub.1-x M(III).sub.x (OH).sub.2 ].sup.x+ (A.sup.n-.sub.x/n).mH.sub.2 O are used, wherein M(II) represents divalent metals, preferably Mg or Zn or NI or Cu or Fe(II) or Co, and M(III) represents trivalent metals, for example Al or Fe(III), and A represents anions, preferably carbonates or borates. These catalysts can be calcinated and can be used in combination with phosphorus compounds that contain at least one hydrolyzable phosphorus-oxygen bond.
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