The present invention is directed towards a powder coating composition comprising a binder; a thermally conductive, electrically insulative filler material; and, optionally, a thermoplastic material and/or a core-shell polymer. The present invention is also directed to a substrate comprising a coating layer deposited from the powder coating composition of the present invention, as well as methods of coating a substrate.

The invention relates to an anti-friction lacquer having a polymer as a resin matrix and functional fillers, the functional fillers containing mixed-phase oxides and optionally further functional fillers. The invention further relates to a sliding element having a metallic substrate layer and a coating which is applied thereon and made of at least such an anti-friction lacquer and to a method for the production thereof.

The present invention provides boron nitride particles that can be used for preparation of a thermally conductive material having excellent thermally conductive properties and peel strength. In addition, the present invention provides a composition for forming a thermally conductive material, a thermally conductive material, a thermally conductive sheet, and a device with a thermally conductive layer, in relation to the boron nitride particles. In the boron nitride particles of the present invention, an atomic concentration ratio of oxygen atomic concentration to boron atomic concentration on a surface, detected by X-ray photoelectron spectroscopy, is 0.12 or greater, and a D value obtained by Equation (1) is 0.010 or less.

D value=B(OH).sub.3(002)/BN(002)  Equation (1) B(OH).sub.3(002): Peak strength derived from a (002) plane of boron hydroxide having a triclinic space group measured by X-ray diffraction BN(002): Peak strength derived from the (002) plane of boron nitride having a hexagonal space group measured by X-ray diffraction.

In an embodiment the dielectric layer comprises a fluoropolymer, a plurality of boron nitride particles, a plurality of titanium dioxide particles, a plurality of silica particles; and a reinforcing layer. The dielectric layer can comprise at least one of 20 to 45 volume percent of the fluoropolymer, 15 to 35 volume percent of the plurality of boron nitride particles, 1 to 32 volume percent of the plurality of titanium dioxide particles, 10 to 35 volume percent of the plurality of silica particles, and 5 to 15 volume percent of the reinforcing layer; wherein the volume percent values are based on a total volume of the dielectric layer.

A non-curable thermally conductive silicone grease composition includes: A. 100 parts by mass of a non-curable silicone oil with a kinematic viscosity of 50 to 10000 mm.sup.2/s at 40° C.; and B. 105 to 500 parts by mass of thermally conductive particles with respect to 100 parts by mass of the component A. The thermally conductive particles contain the following: B1. 50 to 300 parts by mass of irregularly-shaped alumina with a median particle size of 0.1 to 1 .Math.m, in which a part or all of the alumina is surface treated; B2. 5 to 50 parts by mass of plate-like boron nitride with a median particle size of 0.1 to 10 .Math.m; and B3. 50 to 150 parts by mass of aggregated boron nitride with a median particle size of 20 to 70 .Math.m. The B3/B2 blending ratio is 2 to 20. Thus, the thermally conductive silicone grease composition has a high thermal conductivity, but still has a relatively low specific gravity, and also has a viscosity for good workability and good coating properties.

A liquid crystal polyester resin composition includes a liquid crystal polyester resin (A); a solvent (B) in which the liquid crystal polyester resin (A) is dissolved; a fluorine resin (C); and an inorganic filler (D), wherein 100 to 5,000 parts by weight of the solvent (B), 5 to 300 parts by weight of the fluorine resin (C) and 1 to 300 parts by weight of the inorganic filler (D) are included relative to 100 parts by weight of the liquid crystal polyester resin (A).

There is provided a thermally conductive sheet with a metal plate including: a metal plate; and a thermally conductive sheet laminated on the metal plate and containing a thermosetting resin and boron nitride particles, in which an average particle size of the boron nitride particles is 10 μm or more and 100 μm or less, and an amount of warpage of the thermally conductive sheet when the metal plate is removed is 0.15 mm or more and 1.30 mm or less.

Composite resin granules 5 contain a binder resin 2 and a thermally conductive filler. The thermally conductive filler includes a non-anisotropic thermally conductive filler 3 and an anisotropic thermally conductive filler 4. The composite resin granules containing the binder resin and the thermally conductive filler are formed into a spherical shape. The particles of the anisotropic thermally conductive filler 4 are oriented in random directions. A thermally conductive rein molded body 6 of the present invention is obtained by compressing the composite resin granules 5. Thus, the present invention provides the thermally conductive resin molded body that has relatively high thermal conductivities in the in-plane direction and the thickness direction, well-balanced directional properties of thermal conduction, and a low specific gravity, the composite resin granules suitable for the thermally conductive resin molded body, and methods for producing them.

Provided is a boron nitride sintered body including: a plurality of coarse particles each having a length of 20 μm or more; and fine particles smaller than the plurality of coarse particles, in which, when viewed in a cross-section, the plurality of coarse particles intersect with each other. Provided is a method for manufacturing a boron nitride sintered body, the method including: a raw material preparation step of firing a mixture containing boron carbonitride and a boron compound in a nitrogen atmosphere to obtain lump boron nitride having an average particle diameter of 10 to 200 μm; and a sintering step of molding and heating a blend containing the lump boron nitride and a sintering aid to obtain a boron nitride sintered body including coarse particles each having a length of 20 μm or more in a cross-section and fine particles smaller than the coarse particles.

The present invention is a thermally conductive sheet comprising a plurality of unit layers, each comprising a silicone resin and a thermally conductive filler, the plurality of unit layers being laminated such that the plurality of unit layers are adhered to each other, wherein a volume content of the silicone resin is 32% by volume or less, and a compressive load at a sheet area of 25.4 mm×25.4 mm when the thermally conductive sheet is 30% compressed from a direction perpendicular to an adhesion plane on which the plurality of unit layers are adhered to each other is 7.0 kgf or less. According to the present invention, it is possible to improve the thermal conductivity and enhance the softness of a thermally conductive sheet using a silicone resin as a matrix component and composed of a large number of unit layers laminated as compared with the conventional one.