Aqueous coating composition and production of multicoat paint systems using said coating composition

US9976052B2 · kind B2 · utility

Assignee

• BASF COATINGS GMBH · DE

Inventors

• Bernhard Steinmetz · Meiningen, DE
• Nadia Luhmann · Karlstadt, DE
• Peggy Jankowski · Würzburg, DE
• Michael Matura · Würzburg, DE
• Hardy Reuter · Kohlenbissen, DE
• Peter Hoffmann · Senden, DE

Key dates

• Filing date: Dec 11, 2014
• Grant date: May 22, 2018
• Expiry date: Jan 3, 2035

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L2666/20
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to an aqueous coating composition comprising at least one aqueous dispersion comprising at least one copolymer (CP), said copolymer (CP) being preparable by (i) initially charging an aqueous dispersion of at least one polyurethane, and then (ii) polymerizing a mixture of olefinically unsaturated monomers in the presence of the polyurethane from (i), in which (a) a water-soluble initiator is used, (b) the olefinically unsaturated monomers are metered in such that a concentration of 6.0% by weight, based on the total amount of olefinically unsaturated monomers used for polymerization, in the reaction solution is not exceeded over the entire reaction time, and (c) the mixture of the olefinically unsaturated monomers comprises at least one polyolefinically unsaturated monomer, at least one linear hydroxy-functional reaction product (R) having an acid number less than 20 mg KOH/g, the preparation of which involves using at least one compound (v) containing two functional groups (v.a) and an aliphatic or araliphatic hydrocarbyl radical (v.b) which is arranged between the functional groups and has 12 to 70 carbon atoms, and at least one polyurethane resin (X)…