Cathodic electrocoat having a carbamate functional resin

Chemistry: electrical and wave energy – Processes and products – Electrophoresis or electro-osmosis processes and electrolyte...

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Details

528421, 528422, 528196, 528203, C25D 1304

Patent

active

061653381

ABSTRACT:
The invention provides a polymer (a) having a polymer backbone having appended thereto at least one carbamate functional group, the polymer represented by randomly repeating units according to the formula: ##STR1## R.sub.1 represents H or CH.sub.3, R.sub.2 represents H, alkyl, or cycloalkyl, L represents a divalent linking group, A represents repeat units comprising at least one repeat unit having a pendant cationic salting group, x represents 10 to 90 weight %, and y represents 90 to 10 weight %. The invention further provides a cathodic electrocoat coating composition comprising an aqueous dispersion of a polymer (a) and (b) a compound having a plurality of functional groups that are reactive with said carbamate groups, wherein the repeat units A of polymer (a) having a pendant cationic salting group are salted with an acid. Finally, the invention provides a cathodic electrodeposition method requiring 1) immersing a conductive substrate in a coating composition comprising, in an aqueous medium, a polymer (a) and (b) a compound having a plurality of functional groups that are reactive with said carbamate groups, 2) applying a voltage between an anode and the conductive substrate, and 3) removing the substrate from the coating composition.

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