Patent · US Expired

Titanium/zirconium catalysts and their use to prepare esters or polyesters

US6541411B2 · kind B2 · utility

2Cited by

6References

12Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Andreas Hoffmann · North Bend, US
Hartmut Nefzger · Pulheim, DE
Erika Bauer · Höchst im Odenwald, DE

Key dates

Filing date	Nov 27, 2001
Grant date	Apr 1, 2003
Priority date	—
Expiry date	Nov 27, 2021

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G2101/00
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The invention relates to novel titanium/zirconium catalysts, and to a process for the preparation of these titanium/zirconium catalysts. The process comprises reacting orthoesters or condensed orthoesters of titanium and/or zirconium, with one or more polyalcohols. Suitable polyalcohols comprise those compounds having at least two hydroxyl groups and a number average molecular weight of at least 180 g/mol. The invention also relates to a process for preparing (poly)esters from these novel catalysts, which exhibit little discoloration and are suitable to be used as a reaction component in the preparation of polyurethane (PUR) foams.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.