Titanium dioxide/silicon dioxide coprecipitates and titanium dioxide/zirconium dioxide coprecipitates as polycondensation catalysts for polyesters and copolyesters

US5684116A · kind A · utility

Assignee

• AKZO NOBEL N.V. · NL

Inventors

• Michael Martl · Frankfurt, DE
• Thomas Mezger · Zell am Harmersbach, DE
• Gerriet Oberlein · Velbert, DE
• Klaus Haferland · Wuppertal, DE
• Bertram Böhringer · Erkrath, DE
• Ulrich Berger · Trochtelfingen, DE

Key dates

• Filing date: Jul 5, 1996
• Grant date: Nov 4, 1997
• Expiry date: Jul 5, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G63/87
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

For the preparation of polyesters and copolyesters, titanium dioxide/silicon dioxide coprecipitates having a composition of TiO.sub.2 :SiO.sub.2 =90:10 to 20:80 mol/mol and/or titanium dioxide/zirconium dioxide coprecipitates having a composition of TiO.sub.2 : ZrO.sub.2 =95:5 to 70:30 mol/mol are proposed as polycondensation catalysts. They have a higher catalytic activity than Sb.sub.2 O.sub.3, so that the preferred amount used is only 10 to 100 ppm, based on the esters or oligoesters to be subjected to polycondensation.