E.i. Dupont De Nemours and Company

Werner Bosch

Bettina Vogt-Birnbrich

Holger Schmidt

Armin G&ouml;bel

Frank Mueller

Marco Taschner

Armin Goebel

Michael Becker

Thimo Lothert

Georg Antonio Cuddemi

Kornelia Wetzel

Oliver Kraus Vom Cleff

A process for producing multi-layer coatings comprising a waterborne primer-surfacer layer and a topcoat applied thereto on substrates, in which a waterborne primer-surfacer layer is applied from a waterborne primer-surfacer to substrates and baked and then a topcoat is applied, wherein the waterborne primer-surfacer has a binder solids content with a hydroxyl number of 100 to 250 mg KOH/g and contains free or blocked polyisocyanate as a curing agent (crosslinking agent) for the hydroxy-functional binder(s) in a molar ratio of OH/NCO of more than 2:1 to 5:1, and wherein, after it has been applied and before baking, the waterborne primer-surfacer layer is allowed to evaporate for 30 to 300 seconds at 15 to 40&#xb0; C.

Process for the production of multi-layer coatings comprising a waterborne primer-surfacer layer and a topcoat applied thereto

Aqueous binder dispersion which is suitable for the preparation of coating compositions for multilayer lacquerings and is based on polyurethane resins, which can be (meth)acrylated, the optionally (meth)acrylated polyurethane dispersion particles comprising 0.5 to 5 wt. %, based on their solids content, of water-insoluble cellulose esters.

Aqueous dispersion comprising polyurethane-based resins and water-insoluble cellulose ester, methods for preparing and using same, and articles coated with same

The use of linear and/or branched polyethylene oxide homopolymers, polypropylene oxide homopolymers and/or polyethylene/polypropylene oxide copolymers with randomly distributed ethylene oxide and propylene oxide units, which may be partly or completely etherified with C1-C4-alkanols, with an average molecular weight of more than 1000 to 8000, for reducing the clear lacquer wetting limits during two-layered lacquering with aqueous base lacquer/clear lacquer and suitable base lacquers.

Double-layer varnish comprising an aqueous base varnish and clear varnish with improved clear varnish wetting limit

Aqueous coating agents suitable for multi-layered finishes containing an aqueous binder dispersion based on polyurethane/polymer hybrid polymers with a ratio by weight of polyurethane fraction to polymer fraction of 0.1:1 to 50:1, with a hydroxyl value of 0 to 150 mg KOH/g, an acid value of 1.5 to 60 mg KOH/g, and a concentration of 0.5 to 300 mmol of silicon per 100 g of solid resin in the form of siloxane bridges (&mdash;Si&mdash;O&mdash;Si&mdash;) incorporated into the polyurethane fraction and/or in the form of silanol groups bonded to the polyurethane fraction, obtainable by polymerization of olefinically unsaturated monomers in the presence of polyurethane prepolymers which do not contain olefinic double bonds.

Aqueous coating agent, preparation of the same and use thereof for multi-layered lacquering

Pigment preparations, having a solid content of 10 to 60 wt-%, obtainable by mixing together, in the presence of at least one water-miscible organic solvent, pigments coated with a silicon-oxygen-matrix with at least one resin having carboxyl groups sufficient to provide an acid value of 10 to 100 mg KOH/g resin and having an number average molecular mass of 500 to 5000, wherein the ratio of pigment to resin is in the range of 1:0.3 to 1:10, can be used for the preparation of water-borne effect base coats with shear stability.

Pigment preparations and water-borne effect base coats prepared therewith

A process for multi-layer coating by application of a base coat layer of a water-borne base coat to a substrate and subsequent application of a clear coat layer of a powder clear coat, followed by joint baking of both coating layers, wherein said water-borne base coat contains an effective amount, preferably 0.5 to 10 wt. %, of one or more water-insoluble cellulose esters, largely avoids the formation of blisters in the powder clear coat layer.

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Wuppertal, Germany

Werner Bosch