E.i. Dupont De Nemours and Company

Frank Mueller

Werner Bosch

Bettina Vogt-Birnbrich

Holger Schmidt

Marco Taschner

Armin Goebel

Georg Antonio Cuddemi

Kornelia Wetzel

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.

Process for the preparation of multi-layer coatings of the water-borne base coat/powder clear coat type

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Wuppertal, Germany

Frank Mueller