Composition including reflective particles

Patent metadata

Field	Value
Publication number	US-12187901-B2
Application number	US-201916455317-A
Country	US
Kind code	B2
Filing date	Jun 27, 2019
Priority date	Jun 29, 2018
Publication date	Jan 7, 2025
Grant date	Jan 7, 2025

Abstract

A composition includes magnetic particles having a median particle size ranging from about 10 to about 30 microns; and reflective particles having a median particle size ranging from about 1 to about 9 microns, wherein the reflective particles have a lightness at least 10 points higher than the lightness of the magnetic particles. A method of making the composition is also disclosed.

First claim

What is claimed is:

1. A composition comprising:
magnetic particles having a median particle size ranging from about 10 to about 30 microns, the magnetic particles including a reflector layer, a dielectric layer that is external to the reflector layer, and an absorber layer that is external to the dielectric layer; and
reflective particles having magnetic properties and a median particle size ranging from about 1 micron to 5.5 microns;
wherein the reflective particles have a lightness at least 10 points higher than the lightness of the magnetic particles,
wherein the magnetic particles and the reflective particles are pigments in the form of flakes; and
wherein the reflective particles include a reflector layer, a magnetic layer, and a dielectric layer.

2. The composition of claim 1 , wherein the reflector layer of the magnetic particles has a high reflectance and is the magnetic layer of the magnetic particles.

3. The composition of claim 1 , wherein the magnetic particles further include a magnetic layer that is different than the reflector layer.

4. The composition of claim 1 , wherein the magnetic particles include a colored material.

5. The composition of claim 1 , wherein the reflector layer of the reflective particles is the magnetic layer of the reflective particles.

6. The composition of claim 1 , wherein the reflector layer of the reflective particles is different than the magnetic layer of the reflective particles.

7. The composition of claim 1 , wherein the reflector layer of the reflective particles has a high reflectance and is the magnetic layer of the reflective particles.

8. The composition of claim 1 , wherein the reflective particles further include an absorber layer.

9. The composition of claim 1 , further comprising a liquid medium.

10. The composition of claim 1 , wherein the reflective particles are present in the composition in an amount from about 1 to about 40 area percent, based upon the combined particle surface of the magnetic particles and the reflective particles.

11. The composition of claim 1 , wherein the magnetic particles are present in the composition in an amount from about 1 wt. % to about 35 wt. %, based upon the total weight percent of the composition.

12. The composition of claim 1 , wherein the magnetic particles have a median particle size ranging from 13 microns to about 20 microns.

13. The composition of claim 1 , wherein the composition is in the form of an ink, a coating, a varnish, a paint, or a colorant.

14. The composition of claim 1 , wherein the reflective particles do not include an absorber layer external to the dielectric layer.

15. A method of making a composition, comprising:
providing magnetic particles having a median particle size ranging from about 10 to about 30 microns, the magnetic particles including a reflector layer, a dielectric layer that is external to the reflector layer, and an absorber layer that is external to the dielectric layer;
providing reflective particles having magnetic properties and a median particle size ranging from about 1 micron to 5.5 microns; and
blending, in a liquid medium, the magnetic particles with the reflective particles to form a composition
wherein the reflective particles have a lightness at least 10 points higher than the lightness of the magnetic particles,
wherein the magnetic particles and the reflective particles are pigments in the form of flakes; and
wherein the reflective particles include a reflector layer, a magnetic layer, and a dielectric layer.

16. The method of claim 15 , wherein the reflective layer of the reflective particles has a high reflectance and magnetic properties.

17. The method of claim 15 , wherein the reflective particles further include an absorber layer.

18. The method of claim 15 , wherein the reflector layer of the reflective particles is the magnetic layer of the reflective particles.

19. The method of claim 15 , wherein the reflector layer of the reflective particles is different than the magnetic layer of the reflective particles.

20. The method of claim 15 , wherein the reflective particles do not include an absorber layer external to the dielectric layer.

Assignees

• Viavi Solutions Inc

Inventors

• Delst Cornelis Jan
• Kohlmann Paul Thomas

Classifications

• C09D11/00

  Inks · CPC title

• C01P2006/42

  Magnetic properties · CPC title

• H01F1/28

  dispersed or suspended in a bonding agent · CPC title

• C01P2006/60

  Optical properties, e.g. expressed in CIELAB-values · CPC title

• C09D5/004

  Reflecting paints; Signal paints · CPC title