| abstract |
An electrodeposition-color-coating composition which comprises (A) a water-soluble vinyl copolymer containing as the essential constitutional elements of the copolymer 95 to 70 percent by weight of at least one Alpha , Beta -ethylenically unsaturated monomer and an ammonium or amine salt of 5 to 30 percent by weight of at least one Alpha , Beta -ethylenically unsaturated carboxylic acid, or a mixture of a major amount of said vinyl copolymer and a minor amount of a methylol melamine derivative compatible therewith, and (B) at least one member selected from the group consisting of (1) an ammonium or amine salt of a chromogen-bonded polymer obtained by reacting (a) a chromogen having diazonium group or Alpha , Beta -ethylenically unsaturated group with (b) and Alpha , Beta -ethylenically unsaturated carboxylic acid or a mixture of an Alpha , Beta ethylenically unsaturated carboxylic acid and other Alpha , Beta -ethylenically unsaturated monomer, (2) an ammonium or amine salt of a chromogen-bonded polymer prepared by reacting (a'') a chromogen intermediate having a diazonium group or Alpha , Beta -ethylenically unsaturated group, with the above-mentioned component (b) and subsequently subjecting the reaction product to development and (3) an aqueous dispersion of a pigment prepared by previously dispersing the pigment in water with a nonionic or an anionic surface active agent. Said composition can electrophoretically be coated on conductive metals, such as aluminum and an aluminum alloy in a known manner at a potential of 30 to 150 volts, followed by baking the coated metals at 120* to 230* C., whereby a light-fast, corrosion-resistant, colored and transparent coating having protective performances and beautiful appearance can be obtained. |