Preparation of cathodic electrocoating binders

US4315840A · kind A · utility

Assignee

• BASF SE

Inventors

• Fritz E. Kempter · Mannheim, DE
• Eberhard Schupp · Schwetzingen, DE
• Erich Gulbins · Heidelberg, DE

Key dates

• Filing date: Oct 18, 1979
• Grant date: Feb 16, 1982
• Expiry date: Oct 18, 1999

Classification

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

Abstract

A process for the preparation of self-crosslinking, cathodic electrocoating binders by reacting polyether-polyols, which may or may not contain thio groups, with semi-blocked diisocyanates or partially blocked polyisocyanates, wherein the reaction products (A), containing blocked isocyanate groups, are reacted with a polyamine (B), some of whose amino groups may or may not be in the form of ketimine groups, in such a way that one or more amino groups of the polyamine (B) form a urea group with a blocked isocyanate group of the reaction product (A), and the self-cross-linking reaction product of (A) and (B) is converted into a water-dilutable form in the conventional manner by protonization with an acid. The coating binders prepared according to the invention may be used for cathodic electrocoating of metal articles.