Method for producing coatings from coating materials, which...

C - Chemistry – Metallurgy – 08 – G

Patent

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C08G 18/81 (2006.01) C09D 175/16 (2006.01)

Patent

CA 2394543

The invention relates to a method for producing coatings from coating materials, which can be cured thermally and by using actinic radiation, on primed or non-primed substrates by: (1) applying at least one coating material, which can be cured thermally and by using actinic radiation, to a primed or non-primed substrate, whereby producing a layer that is comprised of the coating material, and; (2) curing the layer by using heat and actinic radiation. The inventive method is characterized in that a coating material is used that consists of:(A) compounds, which, with a statistical mean, contain at least one free isocyanate group and at least one bond per molecule that can be activated by means of actinic radiation; (B) (meth)acrylate copolymerizates that contain hydroxyl groups, and optionally of; C) additives selected from the group comprised of pigments, fillers, nanoparticles, bonding agents, reactive diluents, cross-linking agents for thermal curing, solvents, water, UV absorbers, light stabilizers, radical scavengers, initiators, catalysts for thermal cross-linking, degassing agents, slip additives, polymerization inhibitors, defoaming agents, emulsifiers, wetting and dispersing agents, adhesion promoters, flow-controlling agents, film-forming auxiliary agents, sag control agents (SCA), rheology controlling additives (thickeners), flame proofing agents, siccatives, drying agents, skinning inhibitors, corrosion inhibitors, waxes and delustering agents.

L'invention concerne un procédé permettant de produire des revêtements à base de substances de recouvrement durcissables par voie thermique et par rayonnement actinique sur des substrats munis ou non d'un apprêt. Ce procédé comprend les étapes suivantes : (1) appliquer au moins une substance de recouvrement durcissable par voie thermique ou par rayonnement actinique sur le substrat muni ou non d'un apprêt, de manière à former une couche de substance de recouvrement, et (2) durcir ladite couche par apport de chaleur et de rayonnement actinique. Ce procédé se caractérise en ce qu'on utilise une substance de recouvrement comprenant : A) des composés comprenant en moyenne statistique au moins un groupe isocyanate libre et au moins une liaison activable par rayonnement actinique, par molécule, et B) des (méth)acrylate-copolymérisats contenant des groupes hydroxyle, ainsi qu'éventuellement C) des additifs sélectionnés dans le groupe comprenant : pigments, charges, nanoparticules, liants, diluants réactifs, agents de réticulation pour le durcissement thermique, solvants, eau, absorbeurs d'U.V., agents stabilisants contre l'effet de la lumière, agents capteurs de radicaux, initiateurs, catalyseurs pour la réticulation thermique, agents de ventilation, agents glissants, inhibiteurs de polymérisation, agents antimoussants, émulsifiants, agents mouillants et dispersants, agents adhésifs, agents d'écoulement, auxiliaires filmogènes, agents de neutralisation d'affaissement (sag control agents (SCA)), additifs rhéologiques (épaississants), agents ignifuges, siccatifs, agents déshydratants, agents antipeau, inhibiteurs de corrosion, cires et agents de matage.

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