A method of producing multilayer coatings

Details A method of producing multilayer coatings A method of producing multilayer coatings

B - Operations, Transporting

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B05D 1/36 (2006.01) B05D 5/06 (2006.01) B05D 7/00 (2006.01) B05D 7/16 (2006.01) B05D 7/26 (2006.01) C08G 18/10 (2006.01) C09D 175/04 (2006.01)

Patent

CA 2040185

A method of producing multilayer coatings on electrically non conductive substrates, resulting in good optical properties, good hardness and elasticity conditions and resistance to weathering. In the method an aqueous base Lacquer is applied which contains up to 15 wt.% of organic solvent and an aqueous dispersion of A) 70 to 100 wt.% of a partly or completely acid- neutralised cationic poly(meth)acrylate, polyester, polyurethane and/or polyurethane-urea resin, having a number-average molecular weight (Mn) of 500 to 500000, an OH number of 0 to 450, an amine number of 20 to 200 and a glass transition temperature of -50 to +150°C, and B) 0 to 30 wt.% of an amine-formaldehyde condensation resin and/or a blocked polyisocyanate, in each case with at least two groups per molecule reactive with regard to the amino and/or OH groups and/or urethane and/or urea groups in component A, followed by addition of a clear lacquer based on solvent-containing and/or water-containing non-pigmented resins, or application of a clear-lacquer powder, and the base lacquer and clear lacquer are cured either separately or together at temperatures below 160°C.

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