Process for preparing a reduced-color isocyanurate-functional polyisocyanate prepared from 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane (IPDI)

US6093817A · kind A · utility

Assignee

• Huels Aktiengesellschaft · DE

Inventors

• Stephan Kohlstruk · Marl, DE
• Jansen Volker · Moers, DE
• Rainer Lomoelder · Munster, DE

Key dates

• Filing date: Dec 29, 1998
• Grant date: Jul 25, 2000
• Expiry date: Dec 29, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/792
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A reduced-color isocyanurate-functional polyisocyanate is prepared by partially trimerizing 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane (IPDI) having a low total chlorine content of less than 80 mg/kg in the presence of a catalyst, thereby resulting in a product isocyanurate-functional polyisocyanate having a content of free NCO groups of between 10 and 22% and a residual monomer content of less than 0.7%.