Binders water-dilutable by protonation with acid

US4871808A · kind A · utility

Assignee

• Basf Lacke & Farben Aktiengesellschaft · DE

Inventors

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

Key dates

• Filing date: Nov 5, 1987
• Grant date: Oct 3, 1989
• Expiry date: Nov 5, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D163/00
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A binder which is water-dilutable on protonation with acid and obtainable by a reaction of PA0 (A) an epoxy resin having an average molecular weight of from 300 to 6,000 and on average from 1.5 to 3.0 epoxide groups per molecule and PA0 (B) from 20 to 30 mol %, based on the amount of epoxide groups present in epoxy resin (A), of one or more secondary amine and/or alkanolamine of up to 40 carbon atoms and subsequent reaction with PA0 (C) a copolymer which is based on butadiene and acrylonitrile and contains primary and/or secondary amino groups, the amount of (C) being so dimensioned that the number of primary and secondary amino groups corresponds to from 1 to 50 mol % of the epoxide groups present in the epoxy resin (A), and also PA0 (D) with one or more primary and/or secondary amine to convert any epoxide groups still present, is used in particular for cathodic electrocoating.