Aqueous coating compositions pigmented with flake-form metallic effect pigments, processes for preparing them and use thereof for producing multicoat paint finish

摘要

Disclosed are curable aqueous coating compositions comprising at least one polyurethane (A) as binder, at least one laminar metallic effect pigment (B), and at least one inorganic thickener C1) selected from the group of the phyllosilicates, and at least one organic thickener C2) selected from the group of the (meth)acrylic acid-(meth)acrylate copolymer thickeners and polyurethane thickeners, where the amount of B), based on the total binder content of the coating material composition is >9% by weight, the total solids based on the coating material composition is between 12.5% and 17% by weight, the total amount of the thickeners C1 and C2), based on the total binder content of the coating composition is <12.5% by weight, the weight ratio of C2) to C1) is >0.4, and the amount of B), based on the coating material composition, is between 1.2 and 2.3% by weight.

主权项

1. A thermally and/or physically curable aqueous coating material composition comprising:
A) at least one polyurethane selected from the group consisting of physically curable, thermally self-crosslinking and/or thermally externally crosslinking, ionically and/or nonionically stabilized polyurethanes which are saturated, unsaturated and/or grafted with olefinically unsaturated compounds, as binder B) at least one laminar metallic effect pigment not produced via a PVD process, and C) at least one inorganic thickener C1) selected from the group of the phyllosilicates, and at least one organic thickener C2) selected from the group of the (meth)acrylic acid-(meth)acrylate copolymer thickeners and polyurethane thickeners,where
i) the amount of B), based on the total binder content of the coating material composition is >9% by weight, ii) the total solids based on the coating material composition is between 12.5% by weight and 17% by weight, iii) the total amount of the thickeners C1 and C2), based on the total binder content of the coating composition is <12.5% by weight, iv) the weight ratio of C2) to C1) is >0.4, and v) the amount of B), based on the coating material composition, is between 1.2 and 2.3% by weight; wherein the laminar metallic effect pigment (B) is an aluminum effect pigment with silver dollar morphology.