Rheologically active urea urethane compounds

US6617468B2 · kind B2 · utility

Assignee

• BYK-CHEMIE GMBH · DE

Inventors

• Karlheinz Haubennestel · Wesel, DE
• Ulrich Orth · Wesel, DE
• Axel Woocker · Rees, DE
• Heribert Holtkamp · Wesel, DE
• Christoph Buchmann · Wesel, DE

Key dates

• Filing date: Aug 16, 2001
• Grant date: Sep 9, 2003
• Expiry date: Aug 16, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D5/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a process for preparing a solution which comprises urea urethanes and is effective as a thixotropic agent, which involves reacting at least two structurally different monohydroxy compounds with an excess of toluene diisocyanate to form monoisocyanate adducts, removing the unreacted portion of the toluene diisocyanate, and reacting the resultant monoisocyanate adducts with diamines in an aprotic solvent in the presence of a lithium salt to form urea urethanes. The invention also relates to the use of the solution to receive thixotropic coating compositions.