Radar frequency transparent effect pigment mixture, formulations and coatings thereof

US11421111B2 · kind B2 · utility

Assignee

• ECKART GmbH · DE

Inventors

• Carolin Brendel · Nuremberg, DE
• Klaus Greiwe · Lautenbächle, DE
• Robert Maul · Reutlingen, DE
• Oliver Bedford · Ober-Ramstadt, DE
• Günter Kaupp · Jessenitz Siedlung, DE

Key dates

• Filing date: Apr 9, 2020
• Grant date: Aug 23, 2022
• Expiry date: Apr 9, 2040

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09C2200/505
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

This invention deals with effect pigment mixture comprising platelet-like aluminum effect pigments obtained by grinding of aluminum or aluminum based alloy shot and silvery pearlescent pigments, wherein the silvery pearlescent pigments are taken from the group consisting of: a) pearlescent pigments comprising a transparent substrate which is coated with a high-refractive index layer with n>1.8, which comprises or consists of an iron-oxide with Fe(II)-ions, b) pearlescent pigments comprising a transparent substrate which is coated with a high-refractive index layer with n>1.8, which comprises or consists of titanium suboxide or a pearlescent pigment comprising a substrate with a high-refractive index with n>1.8 layer, which comprises or consists of a titanium suboxide that is optionally coated with a high-refractive index layer with n>1.8, c) pearlescent pigments comprising a transparent substrate which is coated with a high-refractive index layer with n>1.8, which comprises or consists of titanium oxynitride, d) pearlescent pigments comprising a transparent substrate which is coated with a layer comprising carbon, wherein the carbon is enclosed in a particulate form in another meta…