Binder which is rendered water-dilutable by protonation with an acid, from carboxyl terminated butadiene/acrylonitrile copolymers

US4769420A · kind A · utility

Assignee

• Basf Lacke & Farben Aktiengesellschaft · DE

Inventors

• Thomas Schwerzel · Meckenheim, DE
• Rolf Osterloh · Lechenich, DE
• Eberhard Schupp · Schwetzingen, DE
• Klaas Ahlers · Munster, DE

Key dates

• Filing date: Nov 25, 1986
• Grant date: Sep 6, 1988
• Expiry date: Nov 25, 2006

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D163/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Binders which are rendered water-dilutable by protonation with an acid, a process for their preparation and their use. These binders are obtainable by reacting a PA0 (A) Reaction product of a PA1 (a) carboxyl-containing component, consisting of a PA1 (a1) carboxyl-containing butadiene/acrylonitrile copolymer having a molecular weight of from 500 to 8,000, if necessary as a mixture with PA1 (a2) a dicarboxylic acid which differs from (a1) and, if appropriate, PA1 (a3) a monocarboxylic acid and PA1 (b) a diprimary and/or primary/secondary amine, with the proviso that from 0.7 to 5 moles of the said amine are used per mole of carboxyl groups of component (a), PA0 with one or more PA0 (B) epoxy resins having a mean molecular weight from 300 to 6,000 and containing on average from 1.5 to 3.0 epoxide groups per molecule and, if required, PA0 (C) an aliphatic or cycloaliphatic secondary amine. In combination with a crosslinking agent, they are useful as coating materials, in particular for cathodic electrocoating.