Decorative microsphere articles with information layer

Patent metadata

Field	Value
Publication number	US-9880332-B2
Application number	US-201415025936-A
Country	US
Kind code	B2
Filing date	Oct 3, 2014
Priority date	Oct 4, 2013
Publication date	Jan 30, 2018
Grant date	Jan 30, 2018

Abstract

Multilayer stacks that can be used as decorative microsphere articles. The decorative microsphere articles can be a durable and aesthetically pleasing substitute for anodized aluminum and other matte metallic surfaces. The decorative microsphere articles are durable and can have a bright diffused appearance of any desired color, for example white, gold, silver, red, or other colors, while being capable of being manufactured using a roll-to-roll process. The decorative microsphere articles can also provide novel optical effects than can change at different viewing angles, including, for example, changing color with view angle, changing sharpness or clarity of an image or icon with view angle, and the like, that may allow customers to differentiate their products.

First claim

What is claimed is:

1. A multilayer stack, comprising:
a light scattering layer for scattering light disposed on a viewing side of the multilayer stack and adapted to face a viewer;
an information layer for displaying information to the viewer viewing the multilayer stack from the viewing side, the information layer being disposed on a back side of the multilayer stack opposite the viewing side and adapted to face away from the viewer; and
a multilayer film reflecting at least 80% of normally incident light having a first polarization state, the multilayer film disposed between the light scattering layer and the information layer, the information being less viewable by the viewer viewing the multilayer stack from the viewing side along a first direction normal to the multilayer stack than along a second direction making an acute angle with the first direction.

2. The multilayer stack of claim 1 , wherein the multilayer film comprises a multilayer polymeric film.

3. The multilayer stack of claim 1 , wherein the multilayer film comprises a multilayer inorganic film.

4. The multilayer stack of claim 1 , wherein the light scattering layer comprises at least one first region that does not scatter light and at least one second region that scatters light.

5. The multilayer stack of claim 1 , wherein at least one first region of the light scattering layer primarily diffusely reflects collimated incident light and at least one second region of the light scattering layer primarily specularly reflects collimated incident light.

6. The multilayer stack of claim 1 , wherein substantial portions of each two neighboring major surfaces in the multilayer stack are in direct physical contact with each other.

7. The multilayer stack of claim 6 , wherein at least 50% of each two neighboring major surfaces in the multilayer stack are in direct physical contact with each other.

8. The multilayer stack of claim 6 , wherein at least 70% of each two neighboring major surfaces in the multilayer stack are in direct physical contact with each other.

9. The multilayer stack of claim 6 , wherein at least 90% of each two neighboring major surfaces in the multilayer stack are in direct physical contact with each other.

10. The multilayer stack of claim 1 not having an air gap between any two neighboring major surfaces in the multilayer stack.

11. The multilayer stack of claim 1 , wherein the light scattering layer comprises a volume light scattering layer.

12. The multilayer stack of claim 11 , wherein the volume light scattering layer comprises a plurality of scattering elements dispersed in a binder.

13. The multilayer stack of claim 12 , wherein a difference between indices of refraction of the binder and the scattering elements is at least 0.05.

14. The multilayer stack of claim 12 , wherein a difference between indices of refraction of the binder and the scattering elements is at least 0.1.

15. The multilayer stack of claim 12 , wherein a difference between indices of refraction of the binder and the scattering elements is in a range from 0.05 to 0.8.

16. The multilayer stack of claim 12 , wherein a difference between indices of refraction of the binder and the scattering elements is in a range from 0.1 to 0.5.

17. The multilayer stack of claim 12 , wherein a difference between indices of refraction of the binder and the scattering elements is in a range from 0.1 to 0.3.

18. The multilayer stack of claim 11 , wherein the volume light scattering layer has a thickness in a range from 100 to 250 microns.

19. The multilayer stack of claim 12 , wherein the plurality of scattering elements comprises a plurality of organic particles.

20. The multilayer stack of claim 12 , wherein the plurality of scattering elements comprises a plurality of inorganic particles.

Assignees

• 3M Innovative Properties Co

Inventors

• Krishnan Vivek
• Holbrook Matthew T
• Wang Sharon
• Alabi Toheeb B
• Mcman Steven J
• Kulseth Kyle E
• Kong Steven Hin-Chung
• Kugel Alexander J

Classifications

• G02B5/02

  Diffusing elements; Afocal elements · CPC title

• G02B5/305 Primary

  including organic materials, e.g. polymeric layers · CPC title

• G02B5/0242 Primary

  by means of dispersed particles · CPC title

• G02B5/0263

  with positional variation of the diffusing properties, e.g. gradient or patterned diffuser · CPC title

• G02B5/0284

  used in reflection · CPC title