Cathodic electrodeposition method
AssigneeBASF SE
InventorTimothy S. December
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Abstract
The invention provides a cationic electrodeposition method requiring the immersion of a conductive substrate in a coating composition, applying a voltage between an anode and the conductive substrate, and removing the substrate from the coating composition. The coating composition of the invention comprises, in an aqueous medium, an aqueous dispersion of a resin composition comprising: (A) a polymer having at least one primary carbamate group and one or more quaternary ammonium groups, (B) a carbamate functional reactive additive which is generated insitu during the production of polymer (A) and (C) a compound having a plurality of active methylol or methylalkoxy groups that are reactive with said carbamate groups.
Claims18
A cathodic electrodeposition method, comprising
- 1) Immersing a conductive substrate in a coating composition comprising, in an aqueous medium, an aqueous dispersion of a resin composition comprising:
- (A) a polymer comprising at least one primary carbamate group and one or more quaternary ammonium groups, and
- (B) a carbamate functional reactive additive which is generated in situ during the production of polymer (A),
- (C) a compound having a plurality of functional groups that are reactive with said carbamate groups, selected from the group consisting of methylol substituted end methylalkoxy substituted aminoplast crosslinking agents and methylol substituted and methylalkoxy substituted phenol/formaldehyde adducts, isocyanate groups, siloxane groups, cyclic carbonate groups and anhydride groups and mixtures thereof,
- 2) appying voltage between an anode and the conductive substrate, and
- 3) removing the substrate from the coating composition.
Dependencies are inferred from the claim text.