Abstract: Disclosed herein are radiation curable coating compositions including a mixture of crosslinkable polymers or oligomers in combination with at least one hydrophobic unsaturated monomer and at least 20 wt. % of hydrophilic unsaturated monomers. The coating of various substrates, in particular plastic substrates, with these coating compositions results in significantly improved surface roughness without the formation of undesired film defects. The coating compositions can be overcoated with commonly known coating compositions to produce multilayer coatings having an improved adhesion, especially wet adhesion, and a high optical quality. Further disclosed herein are a method for forming a coating onto an object and a coated object prepared according to the method. Additionally disclosed herein is a method of using the radiation curable coating composition to improve the surface roughness of plastic substrates, in particular plastic substrates produced by additive manufacturing.

Abstract: The present disclosure relates to two-component coating material compositions including a paint base component A and a curing component B. The paint base component A includes one or more polyols A1 selected from the group of polyols containing ester groups and which possess a hydroxyl number of 300 to 500 mg KOH/g and have a hydroxyl group functionality of greater than 2. The curing component B includes one or more polyisocyanates B1 having on average 2.4 to 5 NCO groups. The two-component coating material composition possesses a solids content of at least 96 wt %, and the molar ratio of the NCO groups in the curing component B to the acidic hydrogen atoms in the paint base component A is from 1:1.15 to 1:0.95. The disclosure further relates to a method for coating fiber-reinforced plastics and to a method for producing coated fiber-reinforced plastics, and to coating fiber-reinforced plastics.

Abstract: Disclosed herein are a recoatable coating composition suitable for use in in-mold coating processes, methods of coating substrates with such compositions, and coated substrates obtained by said method.

Abstract: The present disclosure relates to two-component coating material compositions including a paint base component A and a curing component B. The paint base component A includes one or more polyols A1 selected from the group of polyols containing ester groups and which possess a hydroxyl number of 300 to 500 mg KOH/g and have a hydroxyl group functionality of greater than 2. The curing component B includes one or more polyisocyanates B1 having on average 2.4 to 5 NCO groups. The two-component coating material composition possesses a solids content of at least 96 wt %, and the molar ratio of the NCO groups in the curing component B to the acidic hydrogen atoms in the paint base component A is from 1:1.15 to 1:0.95. The disclosure further relates to a method for coating fiber-reinforced plastics and to a method for producing coated fiber-reinforced plastics, and to coating fiber-reinforced plastics.

Abstract: Disclosed is an aqueous clearcoat material for producing a waterborne urethane-based two-coat coating system, comprising at least one secondary polyacrylate dispersion having a polyacrylate glass transition temperature Tg?20° C. and at least one hybrid polyacrylate-polyurethane dispersion with a weight ratio of the polyacrylate fraction of the secondary dispersion to the polyacrylate-polyurethane fraction of the hybrid dispersion of 1:1 to 4:1, and as curing agent at least one low-viscosity aminosulfonic polyisocyanate and an aqueous basecoat material for producing a waterborne two-coat coating system comprising at least one polyurethane dispersion, at least one hybrid polyacrylate-polyurethane dispersion, and at least one melamine resin. Also disclosed are a waterborne two-coat coating system comprising the clearcoat material and the basecoat material, a process for producing it, its use to coat a substrate, and substrates coated with it.

Abstract: The present invention relates to an aqueous clearcoat material for producing a waterborne urethane-based two-coat coating system, which comprises at least one secondary polyacrylate dispersion having a polyacrylate glass transition temperature Tg?20° C. and at least one hybrid polyacrylate-polyurethane dispersion with a weight ratio of the polyacrylate fraction of the secondary dispersion to the polyacrylate-polyurethane fraction of the hybrid dispersion of 1:1 to 4:1, preferably 2:1 to 3:1, more preferably 2.25:1 to 2.75:1, and as curing agent at least one low-viscosity aminosulfonic polyisocyanate and an aqueous basecoat material for producing a waterborne two-coat coating system which comprises at least one polyurethane dispersion, at least one hybrid polyacrylate-polyurethane dispersion, and at least one melamine resin.

Abstract: The use of aqueous, physically curable, pseudoplastic or thixotropic, polyurethane-based coating materials as adhesion primers for coatings, and a process for coating uncoated plastics surfaces and old coatings by applying at least one coating material to the uncoated plastics surfaces or the old coatings and curing the resulting coating film(s), which comprises applying an aqueous, physically curable, pseudoplastic or thixotropic, polyurethane-based adhesion primer to the uncoated plastics surfaces or the old coatings and overcoating it with at least one further coating material.

Abstract: The use of aqueous, physically curable, pseudoplastic or thixotropic, polyurethane-based coating materials as adhesion primers for coatings, and a process for coating uncoated plastics surfaces and old coatings by applying at least one coating material to the uncoated plastics surfaces or the old coatings and curing the resulting coating film(s), which comprises applying an aqueous, physically curable, pseudoplastic or thixotropic, polyurethane-based adhesion primer to the uncoated plastics surfaces or the old coatings and overcoating it with at least one further coating material.