Crosslinkable composition of matter-I

A crosslinkable composition of matter adapted for use in electrodeposition of coatings on a substrate, which coatings are heat curable, which composition comprises:

• A. substantially gel-free conjugated diene-functionalized epoxy-amine adduct, at least partially neutralized with solubilizing acid, comprising the reaction product of:
• (i) first polyhydroxy functional epoxy-amine reactant comprising the reaction product of polyepoxy reactant having an average of at least about 2 epoxy groups per molecule, with secondary amine reactant having a total of less than about 20 carbons per amino nitrogen, wherein each hydroxy group, if any, of the secondary amine is removed at least 1 carbon from each amino nitrogen, with
• (ii) conjugated diene functional mono-isocyanate reactant;
• and
• B. substantially gel-free dieneophile-functionalized epoxy-anine adduct, other than said conjugated diene functionalized epoxy-amine adduct, at least partially neutralized with solubilizing acid, which dieneophile-functionalized epoxy-amine adduct comprises the reaction product of:
• (i) second polyhydroxy functional epoxy-amine reactant comprising the reaction product of polyepoxy reactant having an average of at least about 2 epoxy groups per molecule, with secondary amine reactant having a total of less than about 20 carbons per amino nitrogen, wherein each hydroxy group, if any, of the secondary amine is removed at least 1 carbon from each amino nitrogen, with
• (ii) dieneophile functional mono-isocyanate reactant;
• which at least partially neutralized diene-functionalized epoxy-amine adduct and dieneophile-functionalized epoxy-amine adduct are dispersed in aqueous solvent.

A crosslinkable composition of matter adapted for use in electrodeposition of coatings on a substrate, which coatings are heat curable, which composition comprises:

• A. substantially gel-free diene-functionalized epoxy-amine adduct of number average molecular weight about 2000-7000, at least partially neutralized with solubilizing acid selected from the group consisting of acetic acid, lactic acid, formic acid, butyric acid and a compatible mixture of any of them, which diene-functionalized epoxy-amine adduct comprises the reaction product of:
• (i) first polyhydroxy functional epoxy-amine reactant comprising the reaction product of polyepoxide reactant having an average of at least about two epoxy groups per molecule with secondary amine reactant selected from the group consisting of dialkanolamine wherein each alkanol moiety has about one to three carbons, with
• (ii) diene functional mono-isocyanate reactant comprising the reaction product of (a) diisocyanate reactant selected from the group consisting of phenylene diisocyanate, toluene diisocyanate, isophorone diisocyanate, diisocyanatoalkane wherein the alkyl moiety has about three to about ten carbons, and a compatible mixture of any of them, with (b) diene reactant selected from the group consisting of furfuryl amine, 2-aminomethyl-1,3-butadiene and a compatible mixture of any of them;
• and
• B. substantially gel-free dieneophile-functionalized epoxy-amine adduct of number average molecular weight about 2000-7000, at least partially neutralized with said organic acid, which dieneophile functionalized epoxy-amine adduct comprises the reaction product of:
• (i) second polyhydroxy functional epoxy-amine reactant comprising the reaction product of polyepoxide reactant having an average of at least about two epoxy groups per molecule with secondary amine reactant selected from the group consisting of dialkanolamine wherein each alkanol moiety has about one to three carbons;
• with
• (ii) dieneophile functional mono-isocyanate reactant comprising the reaction product of (a) diisocyanate reactant selected from the group consisting of phenylene diisocyanate, toluene, diisocyanate, isophorone diisocyanate, diisocyanatoalkane wherein the alkyl moiety has about three to about ten carbons, and a compatible mixture of any of them, with (b) dieneophile reactant selected from the group consisting of methylolmaleimide, hydroxypropylmethacrylate, allyl alcohol, allyl amine, hydroxyethyl-methacrylate, hydroxyethylacrylate and a compatible mixture of any of them;
• which at least partially neutralized diene-functionalized epoxy-amine adduct and dieneophile functionalized epoxy-amine adduct are dispersed together in aqueous solvent.