Catalyst and process for preparing low-viscosity and color-reduced polyisocyanates containing isocyanurate groups

US6613863B2 · kind B2 · utility

Assignee

• Degussa AG · DE

Inventors

• Stephan Kohlstruk · Marl, DE
• Ingo Bockhoff · Marl, DE
• Michael Ewald · Marl, DE
• Rainer Lomoelder · Munster, DE

Key dates

• Filing date: Dec 21, 2001
• Grant date: Sep 2, 2003
• Expiry date: Dec 21, 2021

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2231/341
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A low-viscosity polyisocyanate of reduced color, containing isocyanurate groups is prepared by partially trimerizing an aliphatic and/or cycloaliphatic diisocyanate in the presence of 0.02 to 2% by weight, based on the weight of the diisocyanate starting material, of at least one trimerization catalyst containing a quarternary amine component and then removing excess diisocyanate from the reaction medium.