Highly weather-resistant electrodeposition coating composition

Claim 1

A highly weather-resistant electrodeposition coating composition obtained by: dispersing a mixture of 20 to 90% by weight of an acrylic polycarboxylic resin prepared by copolymerizing an α,β-ethylenically unsaturated carboxylic acid with at least one acrylic monomer, at least one of which having hydroxyl groups, and an ethylenically unsaturated monomer copolymerizable therewith, said acrylic polycarboxylic resin having an acid value of from 30 to 100 and a hydroxyl number of from 20 to 100, with 10 to 80% by weight of fluorocarbon polymer, which is a homopolymer or a copolymer of fluoroolefins and has a particle diameter of from 0.1 to 50 mμ and a melting point not higher than a heating temperature for curing a film formed from said electrodeposition coating compositions, in the presence of at least one water miscible organic solvent selected from the group consisting of alcohols and cellosolve-type solvents, to form a dispersion, followed by neutralizing the dispersion with a neutralizing agent selected for the group consisting of ammonia, dimethylamine, trimethylamine, diethylamine, triethylamine, diisopropylamine, butylamine, monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, N-methylethylamine, N-aminoethylethanolamine, N-methyldiethanolamine and polyglycolamine, said neutralizing agent being used in an amount of from 0.3 to 1.2 equivalents with respect to the carboxyl groups on the acrylic carboxylic resin, and dispersing in water.