Method for producing a multicoat coating
AssigneeBASF Coatings GmbH
InventorsJens-Henning Noatschk, Jan-Bernd Kues, Alberto Garcia Martin, Eva-Kathrin Schillinger, Dirk Riediger
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Abstract
A method for producing a multicoat coating (M) on a substrate (S) that includes:(!) producing a basecoat (B) on the substrate by applying an aqueous basecoat material (b) to the substrate (S), the basecoat material being a two-component coating composition, and (II) producing a clearcoat (K) directly on the basecoat (B) by applying an aqueous clearcoat material (k) directly to the basecoat (B), the clearcoat material being a two-component coating composition.
Claims15
A method for producing a multicoat coating (M) on a substrate (S), the method comprising:
- (I) applying an aqueous basecoat material (b) to the substrate (S) to obtain a basecoat (B) on the substrate (S), the aqueous basecoat material (b) being a two-component coating composition comprising
- (b.1) a base component comprising
- (1) at least one polyurethane resin (1) having a hydroxyl number of 15 to 100 mg KOH/g and an acid number of 10 to 50 mg KOH/g,
- (2) at least one aqueous dispersion comprising water and a polyurethane resin fraction consisting of at least one polyurethane resin, the polyurethane resin fraction having a gel fraction of at least 50%, having a glass transition at a temperature of less than −20° C. and having a melting transition at a temperature of less than 100° C.,
- (3) at least one color pigment, effect pigment, or both, and
- (b.2) a curing component comprising
- (4) at least one hydrophilically modified polyisocyanate (4) having an isocyanate content of 8% to 18%;
- and
- (II) applying an aqueous clearcoat material (k) directly to the basecoat (B) to obtain a clearcoat (K) directly on the basecoat (B), the aqueous clearcoat material (k) being a two-component coating composition comprising
- (k.1) a paint base component comprising
- (2) at least one aqueous dispersion comprising water and a polyurethane resin fraction consisting of at least one polyurethane resin, the polyurethane resin fraction having a gel fraction of at least 50%, having a glass transition at a temperature of less than −20° C. and having a melting transition at a temperature of less than 100° C., and
- (k.2) a curing component comprising
- (4) at least one hydrophilically modified polyisocyanate (4) having an isocyanate content of 8% to 18%.
Dependencies are inferred from the claim text.