Patent number: 6344501
Abstract: The present invention relates to an aqueous powder clearcoat dispersion comprising a solid pulverulent component A and an aqueous component B, where
component A is a transparent powder coating material comprising
a) at least one epoxy binder containing from 25 to 45% by weight, preferably from 25 to 35% by weight, of glycidyl-containing monomers, with or without a fraction of vinylaromatic compounds, preferably styrene,
b) at least one crosslinking agent, preferably straight-chain, aliphatic dicarboxylic acids and/or carboxy-functional polyesters, and
c) if desired, catalysts, auxiliaries, additives typical for transparent powder coating materials, such as devolatilizers, leveling agents, UV absorbers, free-radical scavengers, and antioxidants, and
component B is an aqueous dispersion comprising
a) at least one nonionic thickener and
b) if desired, catalysts, auxiliaries, defoamers, wetting agents, antioxidants, UV absorbers, free-radical scavengers, biocides, small amounts of solvent, leveling agents,
Type:
Grant
Filed:
October 23, 2000
Date of Patent:
February 5, 2002
Assignee:
BASF Coatings AG
Inventors:
Claudia Sierakowski, Karl-Heinz Grosse-Brinkhaus, Egon Wegner, Thomas Frey, Jörg Niemann, Joachim Woltering