Abstract: The invention relates to a cathodically depositable aqueous electropaints which contain cationic amine-modified epoxy resins and are pigmented, with electroconductive carbon black and which, on deposition and crosslinking, provide electrophoroetically overcoatable coatings and contain as electroconductive carbon black a carbon black having an iodine absorption of 870-930 mg/g, a specific surface area (BET/N.sub.2) of 850-1,000 m.sup.2 /g, a pore volume (DBP) of 330-390 ml/100 g and an average particle size of 25-35 nm in an amount of 1.5 to 5.1% by weight--based on total solids.

Abstract: The invention relates to cathodically depositable aqueous electropaints which contain cationic amine-modified epoxy resins and are pigmented with electroconductive carbon black and which, on deposition and crosslinking, provide electrophoretically overcoatable coatings and contain as electroconductive carbon black a carbon black having an iodine absorption of 870-930 mg/g, a specific surface area (BET/N.sub.2) of 850-1,000 m.sup.2 /g, a pore volume (DBP) of 330-390 ml/100 g and an average particle size of 25-35 nm in an amount of 1.5 to 5.1% by weight - based on total solids.

Abstract: The invention relates to a process for coating an electrically conductive substrate, the said substrate being immersed in an aqueous bath based on a cationic synthetic resin binder which is at least in part neutralized with acids and contains amino and/or hydroxyl groups. The said bath contains a mixture of crosslinking agents as well as pigments, fillers, corrosion inhibitors, paint auxiliary substances, and, if appropriate, catalysts, as well as organic solvents in an amount of up to 15% by weight based on the total weight of the coating, the said substrate being cathodically connected. By the action of direct current, a film is deposited on the substrate, after which the said substrate is removed from the bath and the film is cured by stoving, the mixture of crosslinking agents comprising at least two crosslinking agents of different reactivities based on activated esters and/or polyisocyanates blocked by different blocking agents.

Abstract: The invention relates to water-dispersible binders which are intended for cationic electropaints and are based on reaction products which are formed from modified epoxy resins and primary and/or secondary amines and which can, if desired, also contain crosslinking agents, pigments, flow-control agents and other customary auxiliaries. They contain as reaction products those which have been prepared by reacting(A) low molecular weight epoxy resins which contain epoxy compound aromatic groups and have an epoxide equivalent weight of less than 375 with(B) aliphatic and/or alicyclic polyfunctional alcohols having hydroxyl groups or carboxylic acids having carboxylic groups and both having a molecular weight of less than 350 and addition of the hydroxyl groups and carboxylic groups to the epoxy groups of (A) in such a way that the reaction products of (A) and (B) contain 10-45% of aromatic groups, calculated as the phenylene group, and have terminal epoxy groups.

Abstract: This application discloses a synthetic resin based on alcohol-modified polyepoxides. The synthetic resin can be prepared by reacting a diepoxide, or a mixture of diepoxides, having an epoxide equivalent weight of less than about 500, with compounds with a hydroxyl group, which is reactive towards epoxide groups, in a molar ratio from about 2:1 to about 7:6 at temperatures from about 100.degree. C. to about 180.degree. C. in an organic solvent free of hydroxyl groups. The synthetic resin has terminal epoxide gorups and a mean molecular weight from about 400 to about 5000.

Abstract: This application discloses a synthetic resin based on alcohol-modified polyepoxides. The synthetic resin can be prepared by reacting a diepoxide, or a mixture of diepoxides, having an epoxide equivalent weight of less than about 500, with compounds with a hydroxyl group, which is reactive towards epoxide groups, in a molar ratio from about 2:1 to about 7:6 at temperatures from about 100.degree. C. to about 180.degree. C. in an organic solvent free of hydroxyl groups. The synthetic resin has terminal epoxide groups and a mean molecular weight from about 400 to about 5000.

Abstract: A process for coating an electrically conductive substrate, connected as the cathode, with a cationic coating agent from an electrocoating bath and subsequently hardening the coating, is characterized in that an aqueous dispersion made from:A. cationic, synthetic resins which have been protonated with acids, contain basic groups and are in a dissolved or dispersed form andB. dispersed, finely divided, ionic plasticsis used as the cationic coating agent.

Abstract: The invention relates to water-dispersible binders which are intended for cationic electropaints and are based on reaction products which are formed from modified epoxy resins and primary and/or secondary amines and which can, if desired, also contain crosslinking agents, pigments, flow-control agents and other customary auxiliaries.

Abstract: A process for coating an electrically conductive substrate, connected as the cathode, with a cationic coating agent from an electrocoating bath and subsequently hardening the coating, is characterized in that an aqueous dispersion made fromA. cationic, synthetic resins which have been protonated with acids, contain basic groups and are in a dissolved or dispersed form andB. dispersed, finely divided, ionic plasticsis used as the cationic coating agent.

Abstract: A process for the production of a multilayer protective and/or decorative coating upon the surface of a substrate(1) A basecoat composition is applied comprising:(A) a film-forming polymer;(B) a volatile organic liquid diluent in which the polymer is dissolved;(C) polymer microparticles which are insoluble in the solution of the polymer (A) in the liquid diluent (B) and are stably dispersed by steric stabilization therein in a non-flocculated state in an amount of from 3% to 8% of the aggregate weight of the film-forming polymer A and the microparticles;(D) pigment particles also dispersed in the solution of the film-forming polymer in the liquid diluent.(2) A polymer film is formed upon the surface from the composition applied in (1).(3) A transparent topcoat is applied to the basecoat film from a composition comprising:(E) a film-forming polymer; and(F) a volatile carrier liquid for the polymer.(4) A second polymer film is formed upon the basecoat film from the composition applied in (1).