Disclosed herein are coatings having enhanced reflectivity for electromagnetic radiation, as well as a process for producing the coatings.

There is disclosed a functional lamellar particle including an unconverted portion of the lamellar particle, wherein the unconverted portion includes a first metal, a converted portion of the lamellar particle disposed external to a surface of the unconverted portion, wherein the converted portion includes a chemical compound of the first metal; and a functional coating disposed external to a surface of the converted portion.

There is disclosed a functional lamellar particle including an unconverted portion of the lamellar particle, wherein the unconverted portion includes a first metal, a converted portion of the lamellar particle disposed external to a surface of the unconverted portion, wherein the converted portion includes a chemical compound of the first metal; and a functional coating disposed external to a surface of the converted portion.

A new material efficiently attenuating transmission of near-infrared light is provided. A provided near-infrared-shielding material includes a plurality of flaky particles, wherein each of the plurality of flaky particles includes a flaky substrate and a single-layer film formed on a principal surface of the flaky substrate, and the near-infrared-shielding material has a light reflectance of 40% or more between wavelengths of 800 nm and 1400 nm. The flaky substrate is, for example, a glass flake. The glass flake has an average thickness of, for example, 0.6 pm or less. The single-layer film includes, for example, titanium oxide and has an average thickness of, for example, 80 nm to 165 nm.

Provided is an infrared-reflective coating composition that includes: a scale-like infrared-reflective pigment; and a resin component, wherein the pigment includes a layered body that has dielectric layers and a metal thin film layer layered in an alternate fashion with the dielectric layer on the outermost layer; the dielectric layer is formed from one or more materials such as titanium dioxide; the metal thin film layer is formed from a silver compound; a film thickness of the metal thin film layer is 5 to 15 nm; a film thickness of the dielectric layer is ((Nλ)/(4r))±20 nm (N=1, 2 or 3) wherein wavelength λ of incident light is 250 to 980 nm, and r is a refractive index of the dielectric layer; and a proportion of the infrared-reflective pigment having a particle diameter of 1 μm or smaller is 10% by volume or smaller.

A LiDAR reflecting dark colored pigment includes a core layer formed from a reflecting material and a first layer formed from a first absorber material or a first dielectric material extending across the core layer. A second layer formed from a second absorber material different than the third absorber material extends across the first layer and a third layer formed from a third absorber material or a second dielectric material extends across the second layer. The third absorber material is different than the second absorber material. The LiDAR reflecting dark colored pigment reflects less than 10% of incident visible electromagnetic radiation and more than 60% of incident near-IR electromagnetic radiation with wavelengths between and including 850 nm and 950 nm for all incident angles of the visible and near-IR electromagnetic radiation between and including 0° and 45°. A color reflected by the multilayer stack has a lightness in CIELAB color space less than or equal to 40.

The present disclosure provides an optical film, a structural colored pigment, and a method for preparing an optical film. The optical film includes a multilayer film. The multilayer film includes films with high refractive indexes and films with low refractive indexes alternately arranged in a multilayer manner, and a middle film. Some of the films with the high refractive indexes and some of the films with the low refractive indexes are disposed on a side of the middle film, constituting first other films. Optical thicknesses of films having a same refractive index in the optical films and an optical thickness of the middle film are all different or partially different.

Provided is a multi-layer coating film including a base film and an infrared-reflective film, wherein the infrared-reflective film includes a scale-like infrared-reflective pigment and a resin; the pigment includes a layered body that has dielectric layers and a metal layer layered in an alternate fashion with the dielectric layer on the outermost layer; the dielectric layer is formed from one or more materials such as titanium dioxide; the metal layer is made from a silver compound; a film thickness of the metal layer is 5 to 15 nm; a film thickness of the dielectric layer is ((N)/(4r))20 nm (N is 1, 2 or 3, wavelength is 250 to 980 nm, r is the refractive index of the dielectric layer); the infrared reflectance R1 of the base film is smaller than 80% and is smaller than the infrared reflectance R2 of the infrared-reflective film.

There is disclosed a lamellar particle including an unconverted portion of the lamellar particle, wherein the unconverted portion includes a first metal, a converted portion of the lamellar particle disposed radially outward of at least one of a surface of the unconverted portion, wherein the converted portion includes a chemical compound of the first metal.

There is disclosed a lamellar particle including an unconverted portion of the lamellar particle, wherein the unconverted portion includes a first metal, a converted portion of the lamellar particle disposed radially outward of at least one of a surface of the unconverted portion, wherein the converted portion includes a chemical compound of the first metal.