A flake including a layer of a diamagnetic material; and at least one additional layer is disclosed. The flake, such as a plurality of flakes, can be dispersed in a liquid medium to form a composition. The composition can be applied to a surface of a substrate to form a security device. A method of making the security device is also disclosed.

A thermoplastic composition comprising: a polymer material; and a passivated inorganic chromophore comprising an inorganic chromophore and a passivation layer, wherein the inorganic chromophore has the formula: AM.sub.1-xM′.sub.xM″.sub.yO.sub.3+y, wherein A, M, M′, M″, x, and y are as provided herein, and wherein the passivation layer is derived from a passivation material comprising a polysiloxane having at least one functional group that is hydride, hydroxy, alkoxy, aryloxy, epoxy, carboxy, amino, or a combination thereof.

A thermoplastic composition comprising: a polymer material; and a passivated inorganic chromophore comprising an inorganic chromophore and a passivation layer, wherein the inorganic chromophore has the formula: AM.sub.1-xM′.sub.xM″.sub.yO.sub.3+y, wherein A, M, M′, M″, x, and y are as provided herein, and wherein the passivation layer is derived from a passivation material comprising a polysiloxane having at least one functional group that is hydride, hydroxy, alkoxy, aryloxy, epoxy, carboxy, amino, or a combination thereof.

A coating composition includes a binder component (A), a flake-like aluminum pigment (B) having an average particle diameter (d50) of 18 μm to 25 μm, and a flake-like pigment (C) being a flake-like pigment other than flake-like aluminum pigments and having an average particle diameter (d50) of 8 μm to 30 μm. A content of the flake-like aluminum pigment (B) is 10 parts by mass to 50 parts by mass and a content of the flake-like pigment (C) is 0.5 parts by mass to 10 parts by mass, based on 100 parts by mass of the binder component (A). A content ratio (B)/(C) of the flake-like aluminum pigment (B) to the flake-like pigment (C) is 2/1 to 50/1 in terms of a solid content mass ratio.

Method for manufacturing a composite material combining a metal oxide or metalloid based matrix suited for allowing light to pass, and a mineral pigment dispersed in the matrix, the method comprising a step of mixing the mineral pigment in powder form with the matrix in powder form, and a step of sintering of the mixture under sufficient pressure such that the densification temperature of the matrix under said pressure is below the breakdown temperature of the mineral pigment, where the sintering temperature is greater than or equal to the densification temperature of the matrix and below the breakdown temperature of the mineral pigment.

The present invention relates to a technology for producing a black pearlescent pigment for cosmetics which is a human-friendly and nature-friendly by using a pigment including natural charcoal powder. The production method of the pearlescent pigment using natural charcoal according to the present invention includes (a) milling natural charcoal to produce a pigment including natural charcoal powder; and (b) coating a flake substrate with the produced pigment including the natural charcoal powder, wherein the milling is performed at 20 to 40 Hz for 24 to 72 hours, and an average particle size of the pigment including the natural charcoal powder is 100 to 300 nm.

A first object of the present invention is to provide a surface-modified inorganic nitride having excellent dispersibility. Furthermore, a second object of the present invention is to provide a composition, a thermally conductive material, and a device with a thermally conductive layer which contain the surface-modified inorganic nitride. The surface-modified inorganic nitride of the present invention includes an inorganic nitride, and a specific compound adsorbed onto a surface of the inorganic nitride, and the specific compound has a functional group selected from the group consisting of a boronic acid group, an aldehyde group, an isocyanate group, an isothiocyanate group, a cyanate group, an acyl azide group, a succinimide group, a sulfonyl chloride group, a carboxylic acid chloride group, an onium group, a carbonate group, an aryl halide group, a carbodiimide group, an acid anhydride group, a carboxylic acid group, a phosphonic acid group, a phosphinic acid group, a phosphoric acid group, a phosphoric acid ester group, a sulfonic acid group, a halogenated alkyl group, a nitrile group, a nitro group, an ester group, a carbonyl group, an imidoester group, an alkoxysilyl group, an acrylic group, a methacrylic group, an oxetanyl group, a vinyl group, an alkynyl group, a maleimide group, a thiol group, a hydroxyl group, a halogen atom, and an amino group, and has a fused-ring structure containing two or more rings selected from the group consisting of an aromatic hydrocarbon ring and an aromatic heterocyclic ring.

A first object of the present invention is to provide a surface-modified inorganic nitride having excellent dispersibility. Furthermore, a second object of the present invention is to provide a composition, a thermally conductive material, and a device with a thermally conductive layer which contain the surface-modified inorganic nitride. The surface-modified inorganic nitride of the present invention includes an inorganic nitride, and a specific compound adsorbed onto a surface of the inorganic nitride, and the specific compound has a functional group selected from the group consisting of a boronic acid group, an aldehyde group, an isocyanate group, an isothiocyanate group, a cyanate group, an acyl azide group, a succinimide group, a sulfonyl chloride group, a carboxylic acid chloride group, an onium group, a carbonate group, an aryl halide group, a carbodiimide group, an acid anhydride group, a carboxylic acid group, a phosphonic acid group, a phosphinic acid group, a phosphoric acid group, a phosphoric acid ester group, a sulfonic acid group, a halogenated alkyl group, a nitrile group, a nitro group, an ester group, a carbonyl group, an imidoester group, an alkoxysilyl group, an acrylic group, a methacrylic group, an oxetanyl group, a vinyl group, an alkynyl group, a maleimide group, a thiol group, a hydroxyl group, a halogen atom, and an amino group, and has a fused-ring structure containing two or more rings selected from the group consisting of an aromatic hydrocarbon ring and an aromatic heterocyclic ring.

Provided is a method for surface-modifying inorganic particles having a mixing step of mixing at least a surface-modifying material and the inorganic particles to obtain a liquid mixture and a dispersion step of dispersing the inorganic particles in the liquid mixture, in which a content of the inorganic particles in the liquid mixture is 10% by mass or more and 49% by mass or less, and a total content of the surface-modifying material and the inorganic particles in the liquid mixture is 65% by mass or more and 98% by mass or less.

Provided is a method for surface-modifying inorganic particles having a mixing step of mixing at least a surface-modifying material and the inorganic particles to obtain a liquid mixture and a dispersion step of dispersing the inorganic particles in the liquid mixture, in which a content of the inorganic particles in the liquid mixture is 10% by mass or more and 49% by mass or less, and a total content of the surface-modifying material and the inorganic particles in the liquid mixture is 65% by mass or more and 98% by mass or less.