E.i. Dupont De Nemours and Company

Andreas Fieberg

Bettina Vogt-Birnbrich

Allisa Gam

Dietrich Saatweber

Volker Rekowski

Hans-Ulrich Simmrock

Thomas Grawe

Joachim Ruerup

Manfred Evers

Konstadinos Markou

Eduard Ehmann

Process for the anodic electro-dipcoating of conducting surfaces by dipping in an aqueous anodic electro-dipcoating bath and connecting up as the anode, in which an aqueous anodic electro-dipcoating bath is used that contains 1 to 15 wt. %, referred to the binder solids of the electro-dipcoating bath, of one or more phosphoric acid epoxy esters and/or phosphonic acid epoxy esters that have been produced in the presence of alcohols.

Method for the anodic electrophoretic enamelling and electrophoretic paints

An improved aqueous cathodic electrocoating composition that contains an anti-crater agent which is a water-reducible polyester resin having an acid value less than 40 mg KOH/g. The water-reducible polyester is the reaction product of (1) a hydroxy cyclic carbonate; (2) a polycarboxylic acid anhydride; (3) optional monofunctional epoxy resin; (4) a polyfunctional isocyanate resin; and, (5) a polyamine compound containing tertiary amine and either primary or secondary functionality. The reaction product is neutralized in the presence of acid and water to convert the tertiary amine groups to water-dilutable groups. Hydrolyzable silane groups can also be incorporated into the reaction product to further enhance its crater resistance property. The electrocoat composition produces coatings having a smoother appearance with fewer craters without adversely affecting intercoat adhesion of the cured film to subsequent coating layers applied thereover.

Cathodic electrocoating compositions containing an anti-crater agent

An improved aqueous cathodic electrocoating composition that contains an anti-crater agent which is a water-reducible polyester resin having an acid value less than 40 mg KOH/g. The water-reducible polyester is the reaction product of (1) a hydroxy cyclic carbonate; (2) a polycarboxylic acid anhydride; (3) optional monofunctional epoxy resin; (4) a polyfunctional epoxy resin; and, (5) a polyamine compound containing tertiary amine and either primary or secondary functionality. The reaction product is neutralized in the presence of acid and water to convert the tertiary amine groups to water-dilutable groups. Hydrolyzable silane groups can also be incorporated into the reaction product to further enhance its crater resistance property. The electrocoat composition produces coatings having a smoother appearance with fewer craters without adversely affecting intercoat adhesion of the cured film to subsequent coating layers applied thereover.

Aqueous electrophoretic lacquer capable of being deposited cataphoretically, containing

Aqueous electrodeposition paints and the production and use thereof

Aqueous electrodeposition coating, the production and use thereof

Growing community of inventors

Düsseldorf, Germany

Andreas Fieberg