Highly anti-corrosive metal pigments
AssigneeMerck Patent GmbH
InventorsBangyin Li, Nobuaki Nakamura, Katsuhisa Nitta
Life of this patent
Estimating the term…
Abstract
Highly anti-corrosive thin-platelet like metal pigments having high corrosion resistance and good dispersibility characterized in that the inherent metallic luster of the thin-platelet like metal substrates is maintained without demanding the original surface smoothness are provided. The highly anti-corrosive thin-platelet like metal pigments comprising, on the surface of thin-platelet like metal substrates treated with phosphoric acid compounds and/or boric acid compounds, one or more coated layers containing one or more hydrated metal oxides of one or more metals selected from the group consisting of silicon, aluminum, zirconium, titanium and tin.
Claims25
A highly anti-corrosive thin platelet-like metal pigment comprising thin-platelet shaped metal substrates treated with boric acid compounds or phosphoric acid compounds and boric acid compounds, and thereon one or more layers containing one or more hydrated metal oxides of one or more metals selected from the group consisting of silicon, aluminum, zirconium, titanium and tin, whereby said treatment and said layers result in a passivated substrate.
A preparing method of preparing highly anti-corrosive thin platelet-like metal pigments, comprising dispersing a thin-platelet shaped metal substrate in a polar organic solvent, and
- 1) adding phosphoric acid compounds and/or boric acid compounds thereto stirring it, and accordingly treating the substrate,
- 2) preparing a layer of a hydrated metal oxide on the surface of said substrates by sol-gel methods, whereby from (1) and (2) said substrate is passivated.
A highly anti-corrosive thin-platelet shaped metal pigment comprising, on the surface of thin-platelet shaped metal substrates treated with boric acid compounds or phosphoric acid compounds and boric acid compounds, one or more layers containing one or more hydrated metal oxides of one or more metals selected from the group consisting of silicon, aluminum, zirconium, titanium and tin, whereby from said treatment and said layer said substrate is passivated, and further coated with a secondary hydrated metal oxide layer comprising one or more layers, whereby an interference pigment results.
A highly anti-corrosive thin platelet-like metal pigment comprising thin-platelet shaped aluminum flake substrates treated with boric acid compounds or phosphoric acid compounds and boric acid compounds, and thereon one or more layers containing one or more hydrated metal oxides of one or more metals selected from the group consisting of silicon, aluminum, zirconium, titanium and tin, whereby said treatment and said layers result in a passivated substrate.
A highly anti-conosive thin platelet-like metal pigment consisting of thin-platelet shaped metal substrates treated with boric acid compounds or phosphoric acid compounds and boric acid compounds, and thereon one or more layers of one or more hydrated metal oxides of silicon, aluminum, zirconium, titanium and tin, whereby said treatment and said layers result in a passivated substrate.
Dependencies are inferred from the claim text.