Aqueous coating material that is cured thermally and/or by actinic radiation, and its use
AssigneeBASF Coatings GmbH
InventorsKarl Haeberle, Heinz-Peter Rink, Bernhard Lettmann
Life of this patent
Estimating the term…
Abstract
An aqueous coating material curable thermally and/or with actinic radiation, comprising A) at least one ionically and/or nonionically stabilized polyurethane which is saturated, unsaturated and/or grafted with olefinically unsaturated compounds and is based on bis(4-isocyanatocyclohexyl)methane with a trans/trans content of up to 30% by weight, based on the diisocyanate, as binder and B) at least one crosslinking agent.
Claims17
An aqueous coating material, curable by at least one of thermally and with actinic radiation, comprising
- A) a binder comprising at least one polyurethane that is at least one of saturated, unsaturated, and grafted with olefinically unsaturated compounds comprising a reaction product of bis(4-isocyanatocyclohexyl)methane and at least one coreactant;
- wherein the bis(4-isocyanatocyclohexyl)methane has a trans/trans content of less than 20% by weight of the bis(4-isocyanatocyclohexyl)methane;
- and the polyurethane is at least one of ionically stabilized and nonionically stabilized;
- and
- B) at least one crosslinking agent.
A process for producing a multicoat coating system comprising at least one of a color coating system and an effect coating system, by a wet-on-wet technique, comprising
- (I) applying an aqueous basecoat film to a primed or unprimed substrate,
- (II) flashing off and optionally drying the aqueous basecoat film,
- (III) applying a clearcoat film to the aqueous basecoat film, and
- (IV) curing the aqueous basecoat film and the clearcoat film by at least one of thermally and with actinic light,
- wherein material for at least one of the aqueous basecoat film and the clearcoat film is at least one of physically curable, thermally curable, and curable with actinic radiation, and wherein the material comprises at least one polyurethane in a dispersion in an aqueous phase, wherein the polyurethane is at least one of saturated, unsaturated, and grafted with olefinically unsaturated compounds, the polyurethane comprises a reaction product of bis(4-isocyanatocyclohexyl)methane and a coreactant, the bis(4-isocyanatocyclohexyl)methane has a trans/trans content of less than 20% by weight of the bis(4-isocyanatocyclohexyl)methane, and the polyurethane is at least one of ionically stabilized and nonionically stabilized.
A process for producing a multicoat coating system comprising at least one of a color coating system and an effect coating system, by a wet-on-wet technique, comprising one of:
- (A) a first method comprising:
- (I) applying an aqueous basecoat film to a primed or unprimed substrate,
- (II) flashing off and optionally drying the aqueous basecoat film,
- (III) applying a first clearcoat film to the aqueous basecoat film,
- (IV) curing the aqueous basecoat film and the first clearcoat film by at least one of thermally and with actinic light, and
- (V) applying a second clearcoat film, which is materially different from the first clearcoat film, to the cured aqueous basecoat and first clearcoat film;
- (B) a second method comprising:
- (I) applying an aqueous basecoat film to a primed or unprimed substrate,
- (II) flashing off and optionally drying the aqueous basecoat film,
- (III) applying a first clearcoat film to the aqueous basecoat film,
- (IV) flashing off and optionally drying the first clearcoat film,
- (V) applying a second clearcoat film, which is materially different from the first clearcoat film, to the first clearcoat film, and
- (VI) conjointly curing the aqueous basecoat film, the first clearcoat film, and the second clearcoat film;
- wherein material for at least one of the aqueous basecoat film, the first clearcoat film, and the second clearcoat film is at least one of physically curable, thermally curable, and curable with actinic radiation,
- and wherein the material comprises at least one polyurethane that is at least one of saturated, unsaturated, and grafted with olefinically unsaturated compounds comprising a reaction product of bis(4-isocyanatocyclohexyl)methane and at least one coreactant;
- wherein the bis(4-isocyanatocyclohexyl)methane has a trans/trans content of less than 20% by weight of the bis(4-isocyanatocyclohexyl)methane;
- and the polyurethane is at least one of ionically stabilized and nonionically stabilized.
Dependencies are inferred from the claim text.