PROCESS FOR THE PRODUCTION OF A MULTI-LAYER COATING

摘要

A process for the production of a multi-layer coating includes applying a coating layer from an aqueous pigmented coating composition A onto a substrate provided with an EDC primer and applying a base coat layer from an aqueous coating composition B overlying the coating layer. A clear coat layer is applied onto the base coat layer and the three coating layers are jointly bake-cured. The coating compositions A and B are different from each other and coating composition A comprises (i) binder solids, (ii) free polyisocyanate, (iii) a pigment content free of special effect pigments and comprising carbon black pigment and/or titanium dioxide pigment, and (iv) talcum filler.

主权项

1. A process for the production of a multi-layer coating, the process comprising the steps of:
applying an about 10 to about 30 μm thick coating layer from an aqueous pigmented coating composition A onto a substrate provided with an EDC primer; applying an about 10 to about 25 μm thick base coat layer from an aqueous coating composition B onto the coating layer; applying an about 30 to about 50 μm thick clear coat layer onto the base coat layer; jointly bake-curing the three coating layers,wherein aqueous pigmented coating composition A and aqueous coating composition B are different from each other,wherein aqueous pigmented coating composition A comprises (i) binder solids (ii) free polyisocyanate, (iii) a pigment content free of special effect pigments and comprising carbon black pigment and/or titanium dioxide pigment, and (iv) talcum filler, andwherein the wt. % are calculated on a solids basis and total 100 wt. %.