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EP-3854856-B2 - THIN FILM INTERFERENCE PIGMENTS WITH A COATING OF NANOPARTICLES

EP3854856B2EP 3854856 B2EP3854856 B2EP 3854856B2EP-3854856-B2

Inventors

  • ARGOITIA, ALBERTO
  • BOOK, John Edward
  • ZIEBA, JAROSLAW

Dates

Publication Date
20260513
Application Date
20210126

Claims (12)

  1. An article, comprising: a thin film interference pigment being a special effect pigment including a reflector layer, a dielectric layer, and an absorber layer; and a discontinuous coating including colored selectively absorbing nanoparticles on the thin film interference pigment, wherein the selectively absorbing nanoparticles are nanoparticles chosen from a pigment, a dye, a metal carbide, and combinations thereof.
  2. The article of claim 1, wherein the coating is a layer including a blend of two or more different colored selectively absorbing nanoparticles.
  3. The article of claim 2, wherein the blend is equal portions of each of the two or more different colored selectively absorbing nanoparticles.
  4. The article of claim 2, wherein the blend is different portions of each of the two or more different colored selectively absorbing nanoparticles.
  5. The article of claim 1, wherein the coating is multiple layers in which each layer includes a blend of two or more different colored selectively absorbing nanoparticles.
  6. The article of claim 1, wherein the coating is multiple layers including two or more layers in which each layer has colored selectively absorbing nanoparticles.
  7. The article of claim 6, wherein the multiple layers include two or more layers of a first color of selectively absorbing nanoparticles, and two or more layers of a second color of selectively absorbing nanoparticles, wherein the first color is different from the second color.
  8. The article of claim 7, wherein an order of the two or more layers changes a color in reflection and maintains a color in transmission.
  9. The article of claim 6, wherein the two or more layers of colored selectively absorbing nanoparticles include a first layer with a first portion of colored selectively absorbing nanoparticles, and a second layer with a second portion of colored selectively absorbing nanoparticles.
  10. A method of making the article, comprising: providing a thin film interference pigment being a special effect pigment including a reflector layer, a dielectric layer, and an absorber layer; and applying a discontinuous coating including colored selectively absorbing nanoparticles on the thin film interference pigment; wherein the selectively absorbing nanoparticles are nanoparticles chosen from a pigment, a dye, a metal carbide, and combinations thereof.
  11. The method of claim 10, wherein the coating is a layer including a blend of the two or more different colored selectively absorbing nanoparticles.
  12. The method of claim 10, wherein the coating is multiple layers including two or more layers of colored selectively absorbing nanoparticles.

Description

RELATED APPLICATIONS This application claims the benefit of priority to U.S. Provisional Application No. 62/966,391, filed January 27, 2020. FIELD OF THE INVENTION The present disclosure generally relates to an article including a thin film interference pigment; and a coating including a colored selectively absorbing nanoparticle. Methods of making the article are also disclosed. BACKGROUND OF THE INVENTION Fabry-Perot multilayer structures exhibit a color primarily because of the thickness of a dielectric layer present in the structure. The thickness of the dielectric layer therefore limits the pallet of colors that can be produced. One way to manipulate the color produced can be to add a colorant into an ink or paint vehicle that includes the Fabry-Perot multilayer structure. However, a blend of a colorant and a Fabry-Perot multilayer structure can be difficult to formulate to obtain the desired final color due to variables with the colorant, such as colorant concentration, colorant size, colorant distribution. Additionally, a blend of a colorant and a Fabry-Perot multilayer structure can be difficult to reproduce batch-to-batch. Another problem with a blend is the issue of light scattering. In particular, a large quantity of colorant particles distributed in a large volume to create the ink or paint will significantly increase light scattering so that the scattering effects are interdependent. Additionally, colorant absorbing pigments typically used in blends have large particle sizes, which can also increase light scattering because each large particle can independently scatter light. WO 2017/041085, EP 1 254 928 and DE 10 2008 060228 are examples of multilayered films and/or pigments known in the art. BRIEF DESCRIPTION OF THE DRAWINGS Features of the present disclosure are illustrated by way of example and not limited in the following figure(s), in which like numerals indicate like elements, in which: FIG. 1 illustrates the percent reflectance of the gold pre-flake alone, green spotted, and green high saturation;FIG. 2 illustrates the hue of the samples in FIG. 1 using an a*, b* graph;FIG. 3 is a reflectance plot for a thin film interference pigment at low and high angle, and the characteristic absorbance of various selectively absorbing nanoparticles;FIG. 4 is a reflectance plot for the thin film interference pigment of FIG. 3 for various angles from low to high angle;FIG. 5 illustrates a thin film interference pigment with a color travel from green to purple and the characteristic absorbance of various selectively absorbing nanoparticles;FIG. 6 illustrates a thin film interference pigment with a color travel from magenta to green and the characteristic absorbance of various selectively absorbing nanoparticles;FIG. 7 illustrates the percent reflectance of a red to gold color shifting pigment alone, with three bi-layers of a cyan pigment (Exp 3C), and with four bi-layers of a cyan pigment (Exp 4C), under diffuse illumination;FIG. 8 illustrates the hue of the samples in FIG. 7 using an a*, b* graph, under diffuse illumination;FIG. 9 illustrates the lightness of the samples in FIG. 7 using an L*a* graphs, under diffuse illumination;FIG. 10 illustrates the color travel of the samples in FIG. 7 from red to gold, or magenta to green (Exp 3C and Exp 4C), under direct illumination;FIG. 11 illustrates the color travel of the lightness of the samples in FIG. 7 using an L*a* graphs, under direct illumination;FIG. 12 illustrates the percent reflectance of a blue to red color shifting pigment alone, with two bi-layers of a yellow pigment (Exp 2Y), and with three bi-layers of a yellow pigment (Exp 3Y), under diffuse illumination;FIG. 13 illustrates the hue of the samples in FIG. 12 using an a*, b* graph, under diffuse illumination;FIG. 14 illustrates the lightness of the samples in FIG. 12 using an L*a* graphs, under diffuse illumination;FIG. 15 illustrates the color travel of the samples in FIG. 12 from blue to red, or green to orange (Exp 2Y and Exp 3Y), under direct illumination;FIG. 16 illustrates the color travel of the lightness of the samples in FIG. 12 using an L*a* graphs, under direct illumination;FIG. 17 illustrates the percent reflectance of the blue to red color shifting pigment alone, with a blend including cyan and magenta nanoparticles, under diffuse illumination;FIG. 18 illustrates the hue of the samples in FIG. 17 using an a*, b* graph, under diffuse illumination;FIG. 19 illustrates the lightness of the samples in FIG. 17 using an L*a* graphs, under diffuse illumination;FIG. 20 illustrates the color travel of the samples in FIG. 17, under direct illumination;FIG. 21 illustrates the color travel of the lightness of the samples in FIG. 17 using an L*a* graph, under direct illumination;FIG. 22 is a cross-section of an article illustrating the reflected and transmitted color with discrete layer of nanoparticles; andFIG. 23 is a cross-section of an article illustrating the reflected and transmitted col