Herberts Gesellschaft MIT Beschrankter Haftung

Herberts Gmbh

E.i. Dupont De Nemours and Company

Klaus Wandelmaier

Thomas Brock

Stefan Wiggershaus

Coating system for the preparation of aqueous coating compositions

The invention relates to an aqueous binder dispersion for physically drying coating agents, which contains a mixture of

Aqueous binder dispersion for physically drying coating agents and their

A process is described for the production of a multicoat lacquer finish by application of a base coat layer of an aqueous coating agent to a substrate and subsequent application of a layer of a clear coat containing an organic solvent, that leads to coatings with excellent hardness and gloss. For this purpose, for the production of the base coat layer an aqueous coating agent is applied that contains, in addition to water, one or more pigments, and optionally one or more organic solvents, neutralizing agents and customary lacquer additives, as binder a combination of:

Process for multicoat lacquering

Improved aqueous binder dispersions including polyurethanes and water-based physically drying coating compositions containing these aqueous dispersions which are particularly suitable for plain and metallic colored base coats employed for automotive repair lacquer coatings.

Aqueous binder dispersion for physically drying coating compositions and

The application relates to a binder for water-based coating agents, containing a mixture of a carbonate-containing polyurethane prepared by reacting (A)(i) a polyisocyanate containing no hydrophilic groups, (ii) a high molecular weight organic polyhydroxyl compound containing hydrophilic groups and polyhydroxy carbonates, (iii) a lower molecular weight compound containing at least two isocyanate-reacting groups, and (iv) an ionic compound containing at least one isocyanate-reacting hydrogen atom, with (B)(i) one or more polyurethanes prepared by free radical polymerization of a polyurethane macromonomer, in the presence of (ii) an unsaturated monomer copolymerizable with (i).

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Wuppertal, Germany

Klaus Wandelmaier