C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 63/85 (2006.01)
Patent
CA 2164805
For the preparation of polyesters and copolyesters, titanium dioxide precipitates and/or titanium dioxide/silicon dioxide coprecipitates having a composition of TiO2:SiO2 > 90:10 mol/mol and/or titanium dioxide/zirconium dioxide coprecipitates having a composition of TiO2:ZrO2 > 95:5 mol/mol, which have been obtained by hydrolytic precipitation of the corresponding metal alcoholates formed from mono- or polyhydric alcohols, are proposed as polycondensation catalysts. They offer increased safety for the ecosystem and have a higher catalytic activity than Sb2O3, so that the preferred amount used is only 10 to 100 ppm, based on the esters or oligoesters to be subjected to poly- condensation.
Berger Ulrich
Boehringer Bertram
Haferland Klaus
Kuhn Bernhard
Martl Michael
Akzo Nobel Nv
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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