Basf Coatings Gmbh

Stefanie Schroeder

Peter Hoffmann

Matthijs Groenewolt

Jan-Bernd Kues

Andre Brosseit

Karin Homann

Günther Michael

Pedro Cavaleiro

Guenter Klein

Elisabeth Wessling

Kristin Michel

Oliver Hilge

Ulrike Wenking

Hans-Leo Karminski

Jan Bernd Kues

Jan Winsberg

Melanie Glomb

Jan Zaminer

Claas Henrik Hoevelmann

Christian Alter

The present invention relates to a process for the coating of polycarbonate substrates, in particular of transparent polycarbonate substrates, by applying a transparent coating composition encompassing at least one radiation-curing binder resin (A) and/or reactive diluent (C), nanoparticles (B), optionally solvent and at least one light stabilizer (L), to a polycarbonate substrate, wherein the coating composition comprises at least one light stabilizer (L) which comprises, per molecule, an average of at least one ethylenically unsaturated group bonded by way of a urethane group. The present invention also relates to the coating compositions used in said process, and to the coated polycarbonate substrates obtainable via the process, and to their use.

Scratch-resistant-coated polycarbonates with high transparency, process for their production, and their use

The disclosed method comprises applying a transparent coating composition to a plastics substrate, the composition comprising 30% to 60% by weight of a nanoparticles (B), 15% to 40% by weight, of urethane (meth)acrylates (A1) having 3 to 5 (meth)/acrylate groups per molecule, 0% to less than 10% by weight of urethane (meth)acrylates (A2) having more than 5 (meth)/acrylate groups per molecule, 0% to less than 10% by weight of urethane (meth)acrylates (A3) having less than 3 (meth)/acrylate groups per molecule, 55% to 80% by weight of compounds (C1) having 4 (meth)/acrylate groups per molecule, 0% to 15% by weight of compounds (C2) having 2 (meth)/acrylate groups per molecule, and 0% to 15% by weight of compounds (C3) having 3 (meth)/acrylate groups per molecule, the sum of the weight fractions of film-forming components (A1), (A2), (A3), (C1), (C2), and (C3) being in each case 100% by weight.

Plastic substrates having a scratch-resistant coating, in particular housings of electronic devices, having high transparency, method for the production thereof, and use thereof

Disclosed is a coating composition for coating polycarbonate substrates. The coating composition comprises (A) at least one radiation-curing binder, (B) nanoparticles, and (C) optionally at least one reactive diluent and/or optionally a solvent, and wherein the nanoparticles (B) comprise silicon dioxide nanoparticles , the silicon dioxide nanoparticles have a dof between 80 and 300 nm, and the silicon dioxide nanoparticles have a particle size distribution wherein less than 15% by weight of the particles have a size in the range of less than 80 nm, 75% to 95% by weight of the particles have a size in the range from 80 to 300 nm, 0% to 5% by weight of the particles have a size in the range from more than 300 to 1000 nm, and 0% to 5% by weight of the particles have a size in the range from more than 1000 nm to 10 000 nm.

High-transparency polycarbonates with scratch-resistant coating, process for production thereof and use thereof

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Muenster, Germany

Stefanie Schroeder