Titanium-containing catalyst and process for the production of polyester

US5656716A · kind A · utility

Assignees

• Zimmer, Inc. · US
• Sachleben Chemie GmbH · DE

Inventors

• Wolfgang Schmidt · Frankfurt, DE
• Ulrich Thiele · Bruchköbel, DE
• Wolf-Dieter Griebler · Moers, DE
• Bernd Hirthe · Tönisvorst, DE
• Elke Hirschberg · Moers, DE

Key dates

• Filing date: Mar 19, 1996
• Grant date: Aug 12, 1997
• Expiry date: Mar 19, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G63/85
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention comprises a new catalyst for the production of polyesters consisting essentially of a finely dispersed, large surface area titanium compound selected from hydrated TiO.sub.2 obtained by hydrolysis and having the composition yTiO.sub.2.zH.sub.2 O and from titanates having the composition (Me.sub.n O).sub.x.(TiO.sub.2).sub.y.(H.sub.2 O).sub.z, wherein Me is an alkaline earth metal or alkali metal. In addition, the present method comprises a process for the production of polyesters using this catalyst as an esterification or transesterification catalyst and as a polycondensation catalyst, whereby a phosphorous-oxygen-compound is added immediately before, during, or after the polycondensation.