Crosslinkable composition of matter - II

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, at least partially neutralized with solubilizing acid, comprising the reaction product of:
• (i) 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) diene functional mono-isocyanate reactant;
• and
• B. substantially gel-free, substantially isocyante-free dieneophile-functionalized polyisocyanate oligomer having number average dieneophile-functionality of at least about three, which dieneophile-functionalized polyisocyanate oligomer comprises the reaction product of:
• (i) polyisocyanate reactant, with
• (ii) dieneophile functional reactant, wherein said polyisocyanate reactant and said dieneophile functional reactant are reacted in molar equivalent ratio of one to at least about one, respectively,
• which at least partially neutralized diene-functionalized epoxy-amine adduct and dieneophile-functionalized polyisocyanate reactant 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) 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 one to about 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 substantially isocyanate-free dieneophile-functionalized polyisocyanate oligomer having number average dieneophile-functionality of at least about three, comprising the reaction product of:
• (i) triisocyanate reactant, with
• (ii) isocyanate-reactive dieneophile functional reactant wherein said triisocyanate and said dieneophile functional reactant are reacted in molar equivalent ratio of one to at least about one, respectively, said dieneophile functional reactant selected from the group consisting of methylolmaleimide, hydroxypropyl-methacrylate, 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 polyisocyanate oligomer are dispersed together in aqueous solvent.