Cathodically precipitable aqueous electro-dipcoating agent

US4623690A · kind A · utility

Assignee

• Herberts Gesellschaft mit beschrankter Haftung · DE

Inventors

• Hans-Peter Patzschke · Wuppertal, DE
• Armin Gobel · Syke, DE
• Reiner Bohmert · Haan, DE

Key dates

• Filing date: Sep 11, 1984
• Grant date: Nov 18, 1986
• Expiry date: Sep 11, 2004

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D175/12
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A cathodically precipitable aqueous electro-dipcoating agent which includes as Component A, 50 to 99% by mass (relative to the total quantity of Components A and B) of a synthetic resin binder having tertiary amino groups and hydroxyl groups which can be rendered water soluble by protonation with acids, and which PA0 (a) has an amine number of 35 to 120, PA0 (b) has a hydroxyl number of 50 to 400, PA0 (c) has substantially no primary, secondary and quaternary amino groups, PA0 (d) has substantially no free isocyanate groups, and PA0 (e) has substantially no blocked isocyanate groups which can react at baking temperatures of up to 200.degree. C. with hydroxyl groups present in the reaction components. The agent also includes as Component B, 1 to 50% by mass (relative to the total quantity of Components A and B) of substantially non-acid synthetic resins having at least two terminal esterified carboxyl groups which can react under normal lacquer baking conditions with Component A, accompanied by cross-linkage.