Disclosed herein is an aqueous cathodically depositable electrodeposition coating material composition including at least one cathodically depositable polymer and at least one alkoxylated polyethyleneimine. Additionally disclosed herein is a method for at least partially coating an electrically conductive substrate by cathodic electrodeposition coating of the prementioned electrodeposition material. Further disclosed herein is a method of using at least one alkoxylated polyethyleneimine for improving the edge corrosion protection of electrically conductive substrates bearing a baked coating film obtained from the aqueous cathodically depositable electrodeposition coating material composition.

The invention relates to aqueous, cationically stabilized primary dispersions comprising dispersed polymer particles having a Z-average particle diameter of 5 to 500 nm and which are obtainable by emulsion polymerization of at least one olefinically unsaturated monomer (A). The emulsion polymerization takes place in the presence of one or more emulsifiers (EQ) having the following general formula: R.sup.1N.sup.?(R.sup.2)(R.sup.3)(R.sup.4)X.sup.?, where R.sup.1 is a moiety with 15 to 40 carbon atoms which contains at least one aromatic group and at least one aliphatic group, and which contains at least one functional group selected from hydroxyl groups, thiol groups, and primary or secondary amino groups, and/or has at least one carbon-carbon multiple bond, R.sup.2, R.sup.3, and R.sup.4, independently of one another, are the same or different aliphatic moieties containing 1 to 14 carbon atoms, and X stands for the acid anion of an organic or inorganic acid. The invention further relates to a method for producing the primary dispersions, and to coating agents which include the primary dispersions, and to the use of the primary dispersions for producing electrodeposition coatings, and also to conductive substrates coated with the coating compositions. The invention further relates to emulsifiers which are used for producing the primary dispersions according to the invention.

The invention relates to aqueous, cationically stabilized primary dispersions comprising dispersed polymer particles that have a Z-average particle diameter of 5 to 500 nm and are obtainable by emulsion polymerization of at least one olefinically unsaturated monomer (A), wherein the emulsion polymerization takes place in the presence of one or more emulsifiers (E) having the following general formula: R.sup.1(R.sup.2)(R.sup.3), where: R is a moiety that contains at least one aromatic group and at least one aliphatic group, has 15 to 40 carbon atoms, and contains at least one functional group selected from hydroxy groups, thiol groups, and primary or secondary amino groups and/or comprises at least one carbon-carbon multiple bond; and R.sup.1, R.sup.2, and R.sup.3 are, independently of each other, identical or different aliphatic moieties having 1 to 14 carbon atoms. The invention also relates to a method for producing the primary dispersions, coating agents comprising the primary dispersions, use of the primary dispersions to produce electrocoats, and conductive substrates that have been coated with the coating agent compositions.

A method for coating an uncoated or precoated metallic or plastics substrate by (a) applying an aqueous coating composition (W) whose constituents are free or substantially free from blocked isocyanate groups, which comprises an aqueous dispersion of an epoxide-amine adduct, and which comprises either no crosslinking agent or one or more nonblocked polyisocyanate crosslinking agents, to the substrate, (b) optionally applying one or more further coating compositions, and (c) curing the coating composition (W) and, where appropriate, the further coating composition(s) at temperatures of below 90 C.

Disclosed herein is a cathodic electrodeposition coating composition, which includes (A) a cationic amino-containing epoxy resin, (B) a blocked polyisocyanate having neutralized amine, which is obtained by a process including steps of (i) reacting a polyurethane prepolymer containing isocyanate groups with at least one blocking agent selected from the group consisting of oximes, pyrazoles and active methylene compounds, to provide a partially blocked polyisocyanate, (ii) reacting remaining isocyanate groups in the partially blocked polyisocyanate with an amine compound having active hydrogen, to provide an amine-containing blocked polyisocyanates, and (iii) neutralizing the amine-containing blocked polyisocyanates with an acid, and (C) a curing catalyst. Further disclosed herein are a process for preparing the cathodic electrodeposition coating composition, and a coating bath for the cathodic electrodeposition including the cathodic electrodeposition coating composition.

Disclosed herein is a method of dispersing a self-emulsifying crosslinker including at least two steps: i) preparing an aqueous acid dispersion (I) of a self-emulsifying crosslinker, and the microstructure of liquid phase of the aqueous acid dispersion (I) is water-in-oil; and ii) adding water into the aqueous acid dispersion (I) to obtain an aqueous acid dispersion (II), and the microstructure of liquid phase of the aqueous acid dispersion (II) is oil-in-water. Additionally disclosed here is a self-emulsifying crosslinker dispersion prepared by the method and the self-emulsifying crosslinker dispersion has a Z-average particle size in a range of from 50 to 200 nm.

Cathodically depositable electrocoat materials comprising basic bismuth nitrate, further comprising at least one binder having reactive functional groups and at least one crosslinker containing the complementary reactive functional groups which are able to enter into thermal crosslinking reactions.

The invention relates to aqueous, cationically stabilized primary dispersions comprising dispersed polymer particles having a Z-average particle diameter of 5 to 500 nm and which are obtainable by emulsion polymerization of at least one olefinically unsaturated monomer (A). The emulsion polymerization takes place in the presence of one or more emulsifiers (E) having the following general formula: R.sup.1N(R.sup.2)(R.sup.3), where R.sup.1 is a moiety with 15 to 40 carbon atoms which contains at least one aromatic group and at least one aliphatic group, and which contains at least one functional group selected from hydroxyl groups, thiol groups, and primary or secondary amino groups, and/or has at least one carbon-carbon multiple bond, and R.sup.2 and R.sup.3, independently of one another, are the same or different aliphatic moieties containing 1 to 14 carbon atoms. The invention further relates to a method for producing the primary dispersions, and to coating agents which include the primary dispersions, and to the use of the primary dispersions for producing electrodeposition coatings, and also to conductive substrates coated with the coating compositions.

The invention relates to aqueous, cationically stabilized primary dispersions comprising dispersed polymer particles that have a Z-average particle diameter of 5 to 500 nm and are obtainable by emulsion polymerization of at least one olefinically unsaturated monomer (A), wherein the emulsion polymerization takes place in the presence of one or more emulsifiers (E) having the following general formula: R.sup.1(R.sup.2)(R.sup.3), where: R is a moiety that contains at least one aromatic group and at least one aliphatic group, has 15 to 40 carbon atoms, and contains at least one functional group selected from hydroxy groups, thiol groups, and primary or secondary amino groups and/or comprises at least one carbon-carbon multiple bond; and R.sup.1, R.sup.2, and R.sup.3 are, independently of each other, identical or different aliphatic moieties having 1 to 14 carbon atoms. The invention also relates to a method for producing the primary dispersions, coating agents comprising the primary dispersions, use of the primary dispersions to produce electrocoats, and conductive substrates that have been coated with the coating agent compositions.

The present invention relates to a process for the at least two-stage coating of an electrically conductive substrate, the at least two-stage coating being carried out in a single dip-coating bath, the dip-coating bath comprising a coating material composition which comprises at least one cathodically depositable film-forming polymer and also an anodically depositable component, the anodically depositable component comprising anions of at least one phosphorus oxoacid; in a first stage, the electrically conductive substrate for coating is connected as anode in said dip-coating bath, and in a subsequent stage the now precoated substrate is connected as cathode in said dip-coating bath. The invention further relates to a substrate coated by the process of the invention.