High-chromatic flaky pigment coated with semi-transparent film
AssigneeMerck Patent GmbH
InventorNorio Takahashi
Life of this patent
Estimating the term…
Abstract
To provide a high-chromatic flaky pigment with good colorability, and to provide a method for producing the flaky pigment in a simple and inexpensive plant. A high-chromatic flaky pigment of which the entire surface of the flaky substrate coated with a metal oxide having an interference color is further coated with a semi-transparent thin metal film to enhance the interference color of the pigment.
Claims20
A high-chromatic flaky pigment which comprises a flaky substrate of a metal flake pigment coated with a silicon dioxide film or an aluminum oxide film or a silica and alumina film, as a protective film, the substrate being coated over its entire surface with a metal oxide, selected from a group consisting of titanium dioxide, zirconium oxide, iron oxide, tin oxide, zinc oxide and cerium oxide, providing an interference color and further coated with a semi-transparent thin metal film to enhance the interference color of the pigment, wherein the pigment exhibits a color flop effect.
A method for producing a high-chromatic flaky pigment, which pigment comprises a flaky substrate of a metal flake pigment, the substrate being coated over its entire surface with a metal oxide providing an interference color and further coated with a semi-transparent thin metal film to enhance the interference color of the pigment,
- wherein the process comprises coating the entire surface of the flaky substrate with a metal oxide, further coating the entire surface of the metal oxide-coated flaky pigment with a metal layer through reduction of an acetylacetonato-metal complex in an organic solvent, and drying it to form a semi-transparent thin metal film thereon.
Dependencies are inferred from the claim text.