Cathodic electrocoating process
AssigneeSCM Corporation
InventorVincent Daniel McGinniss
Life of this patent
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Abstract
A heat-curable electrocoating composition containing a polymer having pendant mercaptan groups and cross-linking agent having alpha-,beta-ethylenically unsaturated carbonyl groups can be electrodeposited onto a cathode substrate disposed within an aqueous electrocoating bath. Upon electrodeposition onto the substrate, the mercaptan groups cross-link with the alpha-,beta-ethylenically unsaturated carbonyl groups upon curing to form a fully cured electrodeposited coating on the cathode substrate.
Claims11
A process for electrodeposition of a cathodic electrocoating composition onto a cathode substrate disposed within an aqueous electrocoating bath to form a curable electrodepositing coating on said cathode substrate, which comprises:
- cathodically electrodepositing said electrocoating composition dispersed in said bath onto said cathode substrate under cathodic electrocoating conditions, said electrocoating composition comprising (a) a water-dispersed electrocoating polymer having at least about 5% by weight pendant mercaptan groups, and (b) at least about 5% by weight of said polymer of an alpha-,beta-ethylenically unsaturated carbonyl cross-linking agent having at least two alpha-,beta-ethylenically unsaturated carbonyl groups;
- and
- curing said electrodeposited coating on said cathode substrate, said cross-linking agent cross-linking said polymer to form a cured electrodeposited coating on said substrate.
A process for electrodeposition of a cathodic electrocoating composition onto a cathode substrate disposed within an aqueous electrocoating bath to form a curable electrodepositing coating on said cathode substrate, which comprises:
- cathodically electrodepositing said electrocoating composition dispersed in said bath onto said cathode substrate under cathodic electrocoating conditions, said electrocoating composition comprising (a) a water-dispersed electrocoating polymer having at least about 5% by weight pendant mercaptan groups, and (b) at least about 5% by weight of said polymer of an acrylate cross-linking agent having at least two pendant acrylate groups;
- and
- curing said electrodeposited coating on said cathode substrate, said cross-linking agent cross-linking said polymer to form a cured electrodeposited coating on said substrate.
A process for electrodeposition of a cathodic electrocoating composition onto a cathode substrate disposed within an aqueous electrocoating bath to form a curable electrodepositing coating on said cathode substrate, which comprises:
- cathodically electrodepositing said electrocoating composition dispersed in said bath onto said cathode substrate under cathodic electrocoating conditions, said electrocoating composition comprising (a) a water-dispersed electrocoating polymer having at least about 5% by weight pendant mercaptan groups, and (b) at least about 5% by weight of said polymer of an acrylamide cross-linking agent having at least two pendant acrylamide groups;
- and
- curing said electrodeposited coating on said cathode substrate, said cross-linking agent cross-linking said polymer to form a cured electrodeposited coating on said substrate.
Dependencies are inferred from the claim text.