Non-ionically stabilized transparent powder-coating dispersion

US6344501B1 · kind B1 · utility

Assignee

• BASF COATINGS GMBH · DE

Inventors

• Claudia Sierakowski · Seeheim-Jugenheim, DE
• Karl-Heinz Grosse-Brinkhaus · Nottuln, DE
• Egon Wegner · Munster, DE
• Thomas Frey · Brighton, US
• Jörg Niemann · Münster, DE
• Joachim Woltering · Hachenburg, DE

Key dates

• Filing date: Oct 23, 2000
• Grant date: Feb 5, 2002
• Expiry date: Oct 23, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L75/04
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to an aqueous powder clearcoat dispersion comprising a solid pulverulent component A and an aqueous component B, wherecomponent A is a transparent powder coating material comprisinga) 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, andc) if desired, catalysts, auxiliaries, additives typical for transparent powder coating materials, such as devolatilizers, leveling agents, UV absorbers, free-radical scavengers, and antioxidants, andcomponent B is an aqueous dispersion comprisinga) at least one nonionic thickener andb) if desired, catalysts, auxiliaries, defoamers, wetting agents, antioxidants, UV absorbers, free-radical scavengers, biocides, small amounts of solvent, leveling agents, neutralizing agents, preferably amines, and/or water retention agents, andc) a dispersant medium in the form of a nonionic polyurethane dispersion.