The present disclosure relates to a cathodically depositable aqueous electrodeposition coating material including at least one epoxide-amine adduct (a), at least one pigment and/or at least one filler (b), and at least one crosslinking agent (c), a fraction of at least 25 wt % of the crosslinking agent (c), based on the total weight of the crosslinking agent (c), being formed by at least one tris(alkoxycarbonylamino)-1,3,5-triazine; to a method for coating an electrically conductive substrate by cathodic electrodeposition coating using said electrodeposition coating material; to a substrate coated accordingly; and also to a use of a tris(alkoxycarbonylamino)-1,3,5-triazine in a cathodically depositable electrodeposition coating material for reducing or eliminating the sensitivity to disruption of the electrodeposition coating bath toward impurities present therein through phosphates and/or through other metal salts which have been carried into the electrodeposition coating bath as a result of pretreatment steps ahead of the electrodeposition coating.

Aqueous cathodic electrocoating compositions, methods for preparing aqueous cathodic electrocoating compositions, and methods for electrodepositing coatings from aqueous cathodic electrocoating compositions are provided. An aqueous cathodic electrocoating composition having a binder resin and a crosslinking agent is provided. In the aqueous cathodic electrocoating composition, a bismuth-sugar solution is used to provide a catalytic amount of a bismuth compound dispersed in the electrocoating composition.

A cationic electrodeposition paint composition comprising a cationic base-containing resin (A), a blocked polyisocyanate compound (B), and a modified imidazole (C) having a specific structure, wherein the cationic base-containing resin (A) is a cationic base-containing epoxy resin and/or a cationic base-containing acrylic resin.

An epoxy resin, which is obtained by reacting at least a compound having one or more epoxy groups and a compound having a functional group that reacts with the epoxy groups, satisfies conditions (I) and/or (II): (I) the compound having a functional group that reacts with the epoxy groups includes a trihydric or higher phenol compound and/or a compound including a trifunctional or higher polyisocyanate; (II) the epoxy resin has an average degree of polyfunctionalization (X1) per molecule, as expressed by Formula (1), of 0.30 or more:

Average degree of polyfunctionalization (X1)=number of ends per molecule of epoxy resin−2.  Formula (1):

The invention relates to a process for cationic electrodeposition coating using cationic water-dilutable binders comprising a water-soluble bismuth salt or chelate complex B, and a chain-extended epoxy-amine adduct EA which comprises moieties derived from epoxide compounds E2 having at least two epoxide groups per molecule, low molar mass epoxide compounds E3 having two epoxide groups per molecule, one or more of amidoamines A41 having at least one amide group and at least one amino group, made from amines A1 having at least two amino groups per molecule and a fatty acid A4, further amines A1, an amine A2 which has at least one secondary amino group per molecule, an amine A3 having at least one tertiary, and at least one primary amino group per molecule, fatty acids A4, and phenolic compounds A5 having at least two phenolic hydroxyl groups.

The present invention relates to aqueous binder dispersions for cationic electrocoat materials, comprising as binders amine-modified, hydroxy-functional epoxy resins and comprising as crosslinker at least one fully blocked polyisocyanate blocked at least partly with 2,2-dimethyl-1,3-dioxolane-4-methanol, and also to the use of such cationic electrocoat materials for producing coating systems and to the use of crosslinkers based on polyisocyanates blocked with 2,2-dimethyl-1,3-dioxolane-4-methanol in aqueous binder dispersions.

An object of the present invention is to find a method for producing a cationic electrodeposition coating composition that is excellent in storage stability, low-temperature curability, finished appearance, and corrosion resistance, and to provide a coated article excellent in these properties. The method for producing a cationic electrodeposition coating composition comprises mixing three components, i.e., an aqueous dispersion of an amino group-containing epoxy resin (A), an aqueous dispersion of a blocked polyisocyanate compound (B), and a pigment dispersion paste (C), wherein the aqueous dispersion of a blocked polyisocyanate compound (B) comprises a blocked polyisocyanate compound (b) and an emulsifier.

The invention relates to process for the reduction of corrosion of base metals comprising coating the surfaces of a base metal part with a cathodic electrodeposition paint comprising a cationic paint additive C which is a plastified reaction product of epoxide resins E and amines A, wherein the reaction products of epoxides E and amines A further comprise moieties of aromatic or aliphatic dihydroxy or polyhydroxy compounds D, and preferably also of fatty acids F having from six to thirty carbon atoms, and optionally, one or more olefinic unsaturations, and wherein at least a part of the plastifier P is incorporated by chemical reaction within the reaction products of epoxide resins E and amines A.

This invention provides a cationic electrodeposition paint composition comprising an amino-group-containing epoxy resin (A), a blocked polyisocyanate compound (B), and a modified imidazole (C) having a specific structure, wherein the cationic electrodeposition paint composition satisfies the following (i) or (ii), or both: (i) the cationic electrodeposition paint composition further comprises a rust inhibitor (D) or (ii) a blocking agent (b-2) of the blocked polyisocyanate compound (B) is an oxime-based compound (b-2-1) and/or a pyrazole-based compound (b-2-2).

An epoxy resin emulsion includes a continuous phase including an aqueous carrier and an acid. The emulsion also includes a dispersed phase including an epoxy resin. The epoxy resin is the reaction product of an amine compound and a first epoxy reactant. The first epoxy reactant itself includes the reaction product of (1) an aromatic diol monomer, (2) a di-glycidyl ether of Bisphenol A and/or a di-glycidyl ether of catechol, and (3) a C8-C18 alkyl phenolic end-capping agent. The (1) aromatic diol monomer has the structure: ##STR00001##
In this structure, each of R.sup.1-R.sup.4 is independently a hydrogen atom, a C.sub.1-C.sub.8 alkyl group, a C.sub.3-C.sub.8 cycloalkyl group, an aryl group, an aralkyl group, a halide group, a cyano group, a nitro group, a blocked isocyanate group, or a C.sub.1-C.sub.8 alkyloxy group or wherein any two or more of R.sup.1-R.sup.4 may be a fused ring.