Acid-free catalyst paste, its production and its use in cathodic electro-dip coating
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United States of America Patent
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Jan 16, 2001
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N/A
app pub date -
Oct 2, 1998
filing date -
Apr 5, 1996
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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 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 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.
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