Method for producing isocyanate mixtures containing isocyanurate groups

US11359045B2 · kind B2 · utility

Assignee

• Covestro Deutschland AG · DE

Inventors

• Christian Hahn · Leverkusen, DE
• Hans-Detlef Arntz · Overath, DE
• Stephan Schubert · Leverkusen, DE
• Ernst Felske · Neuss, DE
• Claudia Houben · Heinsberg, DE
• Frank Behrendt · Monheim am Rhein, DE

Key dates

• Filing date: Dec 14, 2018
• Grant date: Jun 14, 2022
• Expiry date: May 5, 2039

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/7671
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a continuous method for producing an isocyanurate-containing isocyanate mixture, in which in a step a) a mixture of a first and a second isocyanate component and an isocyanate group trimerization catalyst is provided; in a step b) the mixture obtained in step a) is reacted in a first residence time zone at an elevated temperature; in a step c), the reaction mixture obtained in step b) is further heated in a second residence time zone, optionally after adding a stopper; and in a step d), the reaction mixture obtained in step c) is cooled down in a third residence time zone by way of lowering the temperature, thus obtaining the desired isocyanurate-containing isocyanate mixture.