Alumina powder, resin composition, and heat dissipation component

• Main Authors: OKAMOTO, YOSHIAKI, NITTA, JUNYA, HIRATA, MASAKAZU, KARINO, GENTA, KOMAKI, TAKAFUMI
• Format: Patent
• Language: Chinese; English
• Published: 01.02.2022
• Subjects: ADHESIVES; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS; DYES; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; INORGANIC CHEMISTRY; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; POLISHES; PRINTED CIRCUITS; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS

An alumina powder of the invention comprises first alumina particles having an average particle diameter of at least 0.1 [mu]m but less than 1 [mu]m, second alumina particles having an average particle diameter of at least 1 [mu]m but less than 10 [mu]m, and third alumina particles having an average particle diameter of at least 10 [mu]m but not more than 100 [mu]m, wherein each of these average particle diameters is measured by a laser diffraction and scattering particle distribution measurement device, the first alumina particles having a projected area circle-equivalent diameter determined by microscopy of at least 0.1 [mu]m but not more than 1 [mu]m have an average sphericity of at least 0.80 but not more than 0.98, and the first alumina particles have a specific surface area of at least 1.9 m2/g but not more than 20.0 m2/g, and an [alpha]-crystalline phase content of a least 80% by mass.