Aqueous solutions or dispersions of cationic oligo-urethanes, a process for the production thereof and the use thereof to produce coatings

US4576989A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Klaus Noll · Cologne, DE
• Terry A. Potter · Beaver, US
• Josef Pedain · Cologne, DE
• Jurgen Schwindt · Leverkusen, DE

Key dates

• Filing date: Feb 14, 1985
• Grant date: Mar 18, 1986
• Expiry date: Feb 14, 2005

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F23N2235/10
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention is directed to aqueous solutions or dispersions which may contain blocked polyisocyanates of cationic oligourethanes which are crosslinkable at elevated temperature and contain PA1 (a) about 0.1 to 3% by weight of ternary or quaternary ammonium ions introduced through Michael adducts of secondary amines having at least one hydroxyl group and specific acrylic acid derivatives, PA1 (b) up to about 2.8% by weight of tert. amino nitrogen atoms incorporated through Michael adducts of secondary amines having at least one hydroxyl group and specific acrylic acid derivatives and PA1 (c) about 0 to 15% by weight of blocked isocyanate groups, provided that the ternary ammonium groups of (a), the tert. nitrogen atoms of (b) and the blocked isocyanate groups are present in an equivalent ratio of (a+b):blocked isocyanate groups of about 1:1 to 1:1.5. The present invention is additionally directed to a process for the preparation of these solutions or dispersions of oligourethanes and to their use for coating heat resistant substrates, particularly by coating metallic substrates by cathodic electrodeposition and subsequently cross-linking these coatings at elevated temperat…