Method of coating electrically conductive substrates, aqueous electrodip paints, process for the preparation of an aqueous dispersion of crosslinked polymer microparticles and dispersions prepared by this process

US5589049A · kind A · utility

Assignee

• Basf Lacke & Farben Aktiengesellschaft · DE

Inventors

• G unther Ott · Neukirchen-Vluyn, DE
• Hardy Reuter · Kohlenbissen, DE
• Walter Jouck · Munster, DE
• Susanne Piontek · Munster, DE
• Ulrich Heimann · Munster, DE
• John Gilbert · Beverly Hills, US

Key dates

• Filing date: Aug 22, 1994
• Grant date: Dec 31, 1996
• Expiry date: Aug 22, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D5/4492
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a method of of coating electrically conductive substrates using cathodically depositable electrodip paints. The invention is notable in that the electrodip paints employed contain crosslinked polymer microparticles which can be prepared by reacting (A) a compound which contains on average more than 1.0 epoxide groups per molecule, or a mixture of such compounds, and (B) a compound which contains not only a group reactive toward epoxide groups but also at least one ketimine or aldimine group in the molecule, or a mixture of such compounds to give a noncrosslinked intermediate product (C), which still contains on average at least one epoxide group per molecule, and dispersing this intermediate product in the presence of a Br onsted acid in an aqueous medium.