Binders for cathodic electrocoating

US4752631A · kind A · utility

Assignee

• BASF Aktiengesellschaft, Patentabteilung · DE

Inventors

• Eberhard Schupp · Schwetzingen, DE
• Rolf Osterloh · Lechenich, DE
• Werner Loch · Erpolzheim, DE
• Klaas Ahlers · Munster, DE

Key dates

• Filing date: Nov 25, 1986
• Grant date: Jun 21, 1988
• Expiry date: Nov 25, 2006

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31529
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Binders for cathodic electrocoating which are based on polyadducts/polycondensates which carry basic nitrogen groups and are rendered water-dilutable by protonation with an acid, and one or more crosslinkng agents for these polyadducts/polycondensates, and their use. These binders essentially consist of a mixture of PA1 (A) from 50 to 90% by weight of a polyadduct/polycondensate which carries basic nitrogen groups and is obtainable by reacting PA2 (a) an adduct of a secondary amine and a polyepoxide compound, the adduct still containing free epoxide groups, with PA2 (b) a condensate which contains primary amino groups and is obtained from a primary diamine of not less than 4 carbon atoms and one or more mono- and/or dicarboxylic acids, one or more primary amino groups of the condensate (b) being used per free epoxide group of the adduct (a), and PA1 (B) from 10 to 50% by weight of a crosslinking agent which does not react with component (A) at room temperature but reacts with the latter at elevated temperatures with crosslinking. The binders are useful for the cathodic electrocoating of electrically conductive substrates and as coating materials.