Acid-free catalyst paste, its production and its use in cathodic electro-dip coating

US6174422A · kind A · utility

Assignee

• Herberts Gesellschaft mit beschrankter Haftung · DE

Inventors

• Helmut Honig · Geretsried, DE
• Gabriele Buttner · Ratingen, DE
• Klausjorg Klein · Wuppertal, DE

Key dates

• Filing date: Oct 2, 1998
• Grant date: Jan 16, 2001
• Expiry date: Oct 2, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D5/4492
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

An acid-free, aqueous catalyst paste with a solids content of 30 to 70% by weight and containing dialkyltin oxide and a water-thinnable cationic binder vehicle and which can be used for cathodically depositable electro-dip lacquers, obtainable by PA1 a) dispersing dialkyltin oxide in an acid-free aqueous dispersion or solution of one or more hydroxycarboxylic acid salts of bismuth(III) in a weight ratio of tin to bismuth, calculated as the metal, from 1:3 to 3:1, and PA1 b) comminuting the preparation obtained with one or more cationic binder vehicles in a weight ratio of dialkyltin oxide plus hydroxycarboxylic acid salt of bismuth(III) to cationic binder vehicle from 0.5:1 to 6:1.