Verfahren zur Herstellung von Polyester unter Verwendung von Metallkomplexen

Die Erfindung betrifft ein Verfahren zur Herstellung von Polyester, dadurch gekennzeichnet, dass wenigstens ein Komplex der Formel (I), $F1 wobei das Metall Me ausgewaehlt ist aus der Gruppe, bestehend aus Ti, Zr und Hf, und die Reste R<1<, R<2<, R<3< und R<4< wie in Anspruch 1 definiert sind, als Katalysator eingesetzt wird.

DE 10337522 A UPAB: 20040421 NOVELTY - Method for preparing polyester (A) using at least one metal complex (I) as catalyst. DETAILED DESCRIPTION - Method for preparing polyester (A) using at least one metal complex of formula (I) as catalyst. (R1O)(R2O)(R3O)(R4O)M (I) M = titanium, zirconium or hafnium; R1-R4 = hydrogen, -PO(OR'1)(OR'2), -PO(R5)(OR'3), SO2R'4, CR6=X, CR7=CR8-CR9=X, P(X)(OR11)(OR10), P(X)=CR12R13, P(O)(OH)-O- P(X)(OR'5)(OR'6), P(O)(OR'7)-O-P(X)O, -CR14R'8-C(X)-O- A+, or optionally substituted aryl, alkyl, alkenyl, aminoalkyl or (N-alkylenediamino)alkyl, or R1 with R2, R3 or R4, or R2 with R3 or R4, or R3 with R4 form at least one bridging ligand -P(O)(OR15-O-P(O)(OR16)-; A = alkali metal or ammonium; R5-R16 = hydrogen, P(O)(OR'9)(OR'10), (H)P(O)OR'11, SO2R'12, or optionally substituted alkyl or aryl; R'1-R'12 = optionally substituted alkyl or aryl; and X = oxygen or sulfur; with the proviso that at least one of R1-R4 is other than hydrogen, alkyl or aryl. USE - Preparing polyesters for use as packaging or constructional materials or fibers. ADVANTAGE - (I) provides an economically efficient method for preparing polyesters of number-average molecular weight over 22 kD, without requiring a solid-phase secondary polycondensation stage. (I) are co-ordinatively saturated, so have excellent hydrolytic and thermal stability (contrast alkoxy-titanates or -zirconates) and are not inactivated under polymerization conditions. They produce polyesters with a low metal content (typically 2.5-25 ppm Ti, i.e. significantly lower catalyst consumption than known antimony catalysts), and the production rate and molecular weight of the product can be controlled. Phosphorus-containing (I) provide both catalytic and stabilizing effects in a single compound. (I) that contain nitrogen can scavenge aldehydes formed by thermal decomposition of the polyester.