Composition including reflective particles
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.
1 . A composition comprising:
magnetic particles having a median particle size ranging from about 10 to about 30 microns; wherein the magnetic particles include 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 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, 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 reflectance and magnetic properties.
3 . The composition of claim 1 , wherein the magnetic particles include a magnetic layer that is different than the reflector layer of the magnetic particles.
4 . The composition of claim 1 , wherein the reflector layer of the reflective particles have reflectance and magnetic properties.
5 . The composition of claim 1 , wherein the magnetic layer of the reflective particles is different that the reflector layer of the reflective particles.
6 . The composition of claim 1 , wherein the reflective particles do not include an absorber layer external to the dielectric layer.
7 . The composition of claim 1 , wherein the reflective particles further include an absorber layer external to the dielectric layer.
8 . The composition of claim 1 , further comprising a liquid medium.
9 . 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.
10 . 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.
11 . The composition of claim 1 , wherein the reflective particles have a median particle size ranging from about 1 to about 7 microns.
12 . The composition of claim 1 , wherein the magnetic particles have a median particle size ranging from about 11 to about 20 microns.
13 . The composition of claim 1 , which is in the form of an ink, a coating, a varnish, a paint, or a colorant.
14 . A method of making a composition, comprising:
providing magnetic particles having a median particle size ranging from about 10 to about 30 microns; wherein the magnetic particles include 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 a median particle size ranging from about 1 to about 9 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, and
wherein the reflective particles include a reflector layer, a magnetic layer, and a dielectric layer.
15 . The method of claim 14 , wherein the reflective particles do not include an absorber layer external to the dielectric layer.
16 . The method of claim 14 , wherein the composition is in the form of an ink, a coating, a varnish, a paint, or a colorant.