| 摘要 |
The invention provides a polymer (a) having a polymer backbone having append ed thereto at least one carbamate functional group, the polymer represented by randomly repeating units according to the formula: (I) R1 represents H or CH 3, R2 represents H, alkyl, or cycloalkyl, L represents a divalent linking group , A represents repeat units comprising at least one repeat unit having a penda nt 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.
|
