B - Operations – Transporting – 05 – D
Patent
B - Operations, Transporting
05
D
B05D 1/36 (2006.01) C08G 18/08 (2006.01) C08G 18/10 (2006.01) C09D 175/04 (2006.01)
Patent
CA 2126113
Herberts Gesellschaft mit beschrankter Haftung Abstract: A process is described for the production of a multicoat lacquer finish by application of a base coat layer of an aqueous coating agent to a substrate and subsequent application of a layer of a clear coat containing an organic solvent, that leads to coatings with excellent hardness and gloss. For this purpose, for the production of the base coat layer an aqueous coating agent is applied that contains, in addition to water, one or more pigments, and optionally one or more organic solvents, neutralizing agents and customary lacquer additives, as binder a combination of: I) 99.5 to 85 wt% of one or more aqueous, physically drying polyurethane binders with such a content of OH groups and acid functions that the OH number 10 and the acid number 30 are not exceeded, of which 10 to 50 wt%, relative to the solids weight of component I), can be replaced by one or more reaction products of carboxy-functional polycondensates with ethylenically unsaturated monomers and II) 0.5 to 15 wt% of one or more polyisocyanates, liquid at room temperature or liquefied by organic solvents, with more than one free isocyanate group from the group of the diisocyanates of the general formula Image (I) wherein the groups R1 and R2 can in each case be the same or different and wherein R1 = -H or -CnH2n+1 R2 = -CnH2n+1 wherein n = a whole number of 1 to 6 and A = a single bond, an aromatic or alicyclic residue, or a linear or branched aliphatic residue with 1 to 12 carbon atoms and/or polyisocyanates derived therefrom, wherein up to 40 wt%, relative to the solids weight of the polyisocyanate component II, can be replaced by one or more polyisocyanates different therefrom, that are liquid at room temperature or liquefied by organic solvents, and have more than one free isocyanate group, wherein the wt% of components I) and II) both relate to their solids content and add up to 100 wt% and wherein component II) is added to the coating agent shortly before its application.
Brock Thomas
Wandelmaier Klaus
Herberts Gesellschaft Mit Beschrankter Haftung
Kirby Eades Gale Baker
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