Water-dispersible binders for cationic electropaints, and a process for their preparation

US4436878A · kind A · utility

Assignee

• BASF Farben Fasern Aktiengesellschaft · DE

Inventors

• Wolfgang Batzill · Munster, DE
• Horst Diefenbach · Nottuln, DE
• Michael Geist · Munster, DE
• Eberhard Schupp · Schwetzingen, DE

Key dates

• Filing date: Mar 3, 1983
• Grant date: Mar 13, 1984
• Expiry date: Mar 3, 2003

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S524/901
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to water-dispersible binders which are intended for cationic electropaints and are based on reaction products which are formed from modified epoxy resins and primary and/or secondary amines and which can, if desired, also contain crosslinking agents, pigments, flow-control agents and other customary auxiliaries. The reaction products have been prepared by reacting PA0 (A) Low molecular weight epoxy resins which contain aromatic groups and have an epoxide equivalent weight of less than 375 with PA0 (B) aliphatic and/or alicyclic polyfunctional alcohols or carboxylic acids having a molecular weight of less than 350 by addition to the epoxy group in such a way that the reaction products contain 10-45% of aromatic groups, calculated as phenylene group, and reacting the reaction products of A and B with PA0 (C) if desired up to 60% by weight, relative to total binder, of polyfunctional alcohols, carboxylic acids and/or SH compounds having a molecular weight of 300-5,000, the molar ratios of (A), (B) and, if desired, (C) being chosen in such a way that the resulting intermediate product has terminal epoxy groups, PA0 (D) by reacting the intermediate product by the a…