Color shifting carbon-containing interference pigments and foils
AssigneeFlex Products, Inc.
InventorRoger W. Phillips
Life of this patent
Estimating the term…
Abstract
A color shifting multilayer interference film is provided which may be used to produce foils or flakes for use in pigment compositions and colorants having color shifting properties. The flakes can be interspersed into a pigment medium to form paints, inks, or cosmetic preparations which can subsequently be applied to objects, papers, or people. Three and five layer designs of the interference film include alternating layers of a dielectric material and carbon in various configurations. The dielectric layers are formed to have an optical thickness at a design wavelength that provides a color shift as the angle of incident light or viewing angle changes.
Claims39
A color shifting pigment flake, comprising:
- a first dielectric layer;
- a first carbon layer overlying the first dielectric layer;
- and
- a second dielectric layer overlying the first carbon layer;
- wherein the first and second dielectric layers have an optical thickness at a design wavelength that provides a color shift as the angle of incident light or viewing angle changes.
A color shifting foil, comprising:
- a first dielectric layer;
- a first carbon layer overlying the first dielectric layer;
- and
- a second dielectric layer overlying the first carbon layer;
- wherein the first and second dielectric layers have an optical thickness at a design wavelength that provides a color shift as the angle of incident light or viewing angle changes.
Dependencies are inferred from the claim text.