Self-crosslinking aqueous polyurethane dispersions

US7393894B2 · kind B2 · utility

Assignee

• Cytec Surface Specialties Austria GmbH · AT

Inventors

• Markus Schafheutle · Hochheim, DE
• Anton Arzt · Tillmitsch Links der Laßnitz, AT
• Julius Burkl · Graz, AT
• Gudrun Garber · Graz, AT
• Hannelore Gsöll · Graz, AT
• Rudolf Jedlicka · Wiener Neustadt, AT
• Susanne Neumayer · Graz, AT
• Gerlinde Petritsch · Graz, AT
• Renate Pittermann · Gleisdorf, AT
• Jörg Wango · Wundschuh, AT

Key dates

• Filing date: Jun 3, 2004
• Grant date: Jul 1, 2008
• Expiry date: Jun 3, 2024

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/679
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to self-crosslinking aqueous polyurethane dispersions containing a crosslinking agent I selected from diamones I1 and dihydrazides I2, and polyurethanes comprising structural elements derived from polyisocyanates A, polyols B having a number average molar mass Mn of at least 400 g/mol, compounds D comprising at least two groups which are reactive compared to isocyanate groups and at least one group able to form anions, low-molecular polyols E that carry no other reactive groups compared to isocyanate groups, compounds F containing at least one group which is reactive compared to isocyanate, and at least one aldehyde-type or ketone-type carbonyl group, and compounds G that are monofunctional compared to isocyanates or contain active hydrogen with different capabilities of reaction and are different from the compounds E. The invention also relates to methods for the production of said dispersions, and coating agents containing the same.