Abstract: Provided is a method for manufacturing a spherical particle material in which the particle size distribution is easily controlled. This method has: a granulation step of granulating a raw particle material formed of an inorganic material having a D50 of not larger than 5 ?m to form a granulated body; and a spherizing step of heating and melting the granulated body to form the spherical particle material having a D50 larger than a D50 of the raw particle material. A melting method is used as a basic method for manufacturing the spherical particle material having a necessary particle size distribution. The granulated body is used to manufacture the spherical particle material having the necessary particle size distribution by the melting method.

Abstract: Provided is a method for producing an electronic material filler having excellent performance. The method includes a burning step of putting a particle raw material in flame obtained by burning combustible carbon-free gas containing no carbon to form a particle material to be contained in the electronic material filler. By adopting, as combustible gas, combustible gas containing no carbon, conductive particles formed of carbon are not generated in principle. Therefore, a step of removing the conductive particles formed of carbon by sieving or the like is not required. Particularly, carbon derived from hydrocarbon gas is adhered to and formed on, for example, the surface of the particle material or is formed in the particle material. Therefore, the carbon may not be completely removed by sieving or the like. However, the production method of the present invention prevents the carbon from being mixed in principle.

Abstract: A metal oxide particle material contains a metal oxide as a main component and has: a D50 of 1.0 ?m or more and 5.0 ?m or less, the D50 being obtained by measuring a laser diffraction particle size distribution; a specific surface area of 1.0 m2/g or more and 30 m2/g or less; a coarse particle content of 300 ppm or less, the coarse particle content being a content of coarse particles having a particle diameter of 5 ?m or more; and a hollow particle content of 4000 particles/10 mg or less, the hollow particle content being a content of hollow particles having a particle diameter of 5 ?m or more. When a resin material is filled with the metal oxide particle material at a solid concentration of 60% by mass, a resultant resin composition has a viscosity of 170 Pa·s or less (at a shear velocity of 1 s?1).

Abstract: An object to be achieved is to provide a calcium titanate particle material in which change in color due to radiation of ultraviolet rays is suppressed. A calcium titanate particle material of the present disclosure for achieving the above object has: a circularity of 0.8 or more; and a volume-average particle diameter and a specific surface area respectively represented by “a” (?m) and “b” (m2/g), the “a” being 0.1 or more and 8 or less, “ab” being less than 4. Since the calcium titanate particle material has this configuration, the relationship between the volume-average particle diameter and the specific surface area is made appropriate. As a result, the calcium titanate particle material allows suppression of change in color occurring over time.

Abstract: An object is to provide a modified metal oxide particle material that maintains high dispersibility even when the amount of modifying material is small. The material includes (i) a metal oxide particle material having, on its surface, a functional group other than a phenyl group; and (ii) a modifying material composed of a silicon-containing compound having a phenyl group, adhered to the surface of the metal oxide particle material. The value C/H, calculated from the carbon content C (mass %) and the specific surface area H (m{circumflex over (?)}2 per g), decreases by ?0.001, ?0.01, or ?0.03 and <0.1 after washing with methyl ethyl ketone. The grind gauge is ?20 ?m. The post-wash C/H is ?0.07.

Abstract: An object of the present invention is to provide a composite oxide particle material formed of zinc molybdate having a high purity and a high circularity. The composite oxide particle material is formed of a composite oxide, of molybdenum and zinc, having an average particle diameter of 0.1 ?m or more and 5.0 ?m or less, a BET specific surface area of 1 m2/g or more and 20 m2/g or less, (peak intensity at 26.6° according to XRD)/(peak intensity at 24.2°) of 1.20 or more, an impurity concentration of 1 mass % or less, and a circularity of 0.90 or more. XRD is measured with CuK? radiation.

Abstract: An object is to provide a production method that is a method for producing a spherical particle material by a melting method and that makes a melting spheroidization ratio higher than the conventional method. A production method for a spherical particle material of the present disclosure achieving the above object includes: a raw particle material preparation step of preparing a raw particle material composed of an inorganic material; and a spheroidization step of feeding the raw particle material into a high-temperature atmosphere to melt the raw particle material and then rapidly cooling the raw particle material to prepare a spherical particle material having a volume average particle diameter of 1 ?m or more and less than 10 ?m, and a powder compressibility evaluation FF value, by a powder rheometer, of the raw particle material is 2.0 or more.

Abstract: By controlling the proportion of particles having specific particle diameters, fluidity became high, and filling ability was improved. A silica particle material of the present disclosure has a D50 of 0.8 ?m to 2.5 ?m and a D90/D10 of 2.0 or higher. In 0.35 ?L of a liquid dispersion in which 1 mass % of the silica particle material is dispersed in methyl ethyl ketone (MEK), the number of particles of 3 ?m or larger is 50 or less, the number of particles of 2 ?m or larger and smaller than 3 ?m is 1000 or more, and the number of particles of 1 ?m or larger and smaller than 2 ?m is 10000 or more. A slurry composition in which 75 mass % of the silica particle material is dispersed in an epoxy resin has a viscosity of 10000 Pa·s or lower at a shear rate of 1.0/s.

Abstract: A method for producing spherical silica particles according to the present disclosure includes: a raw material silica particle preparation step of preparing a liquid dispersion of raw material silica particles from a raw material solution obtained by dissolving silicic acid in a mixed solvent of water and an organic solvent in the presence of a basic substance; and a heating step of heating the liquid dispersion or the raw material silica particles so as to remove an organic substance contained in the liquid dispersion, thereby preparing spherical silica particles. The mixed solvent has a relative permittivity of 21 or higher and 40 or lower, and a quaternary ammonium derived from the basic substance is blended in a blending ratio of 0.3 or higher and 0.8 or lower in terms of molar ratio with respect to a silicon element derived from the silicic acid.

Abstract: An object is to provide a novel method for producing spherical silica particles having fine voids. That is, spherical silica particles according to the present disclosure contain silica as a main component, have an average particle diameter of 0.1 to 10.0 ?m, a true specific gravity of 0.9 to 1.9 g/cm3, the true specific gravity being measured with nitrogen gas, a pore volume of 0.1 mL/g or lower, an Na content of 10 ppm or lower, and a true specific gravity retention rate of 80% or higher, the true specific gravity retention rate being measured with nitrogen gas and being a rate between before and after pressurization is performed at 300 MPa for 1 minute, and include, in an existence proportion of 60% or lower, particles in each of which a maximum value among major axes of internal voids is not smaller than half a major axis of the particle.

Abstract: A method for producing an alumina particle material according to the present disclosure includes a raw particle material preparation step of preparing a raw particle material containing alumina as a main component, a heating step of preparing a dried raw particle material by maintaining the raw particle material at 100° C. or higher for 5 minutes or more, and a surface treatment step of treating the dried raw particle material subjected to the heating step and having less moisture adsorbed on a surface thereof than that before the heating step, using a surface treatment agent, to mask at least a portion of OH groups present on the surface. Alumina constituting the alumina particle material has OH groups on a surface thereof. Since a large number of water molecules are adsorbed onto the OH groups, the adsorbed moisture is removed through the heating step.

Abstract: Provided is a ferrule polishing material suitable for polishing a ferrule. A ferrule polishing material of the present invention solving the above object includes a binder formed from a resin material and abrasive grains dispersed in the binder. The resin material is formed from an epoxy resin. The abrasive grains are contained in an amount of not less than 80% and not greater than 91% with respect to the sum of masses of the abrasive grains and the binder, include small-diameter particles being particles having a particle diameter of not greater than 100 nm, the small-diameter particles being present in an amount of not less than 62.5% and not greater than 80% with respect to the mass of the abrasive grains, and are formed from silica.

Abstract: An object is to provide a novel method for producing spherical silica particles having fine voids. That is, spherical silica particles according to the present disclosure contain silica as a main component, have an average particle diameter of 0.1 to 10.0 ?m, a true specific gravity of 0.9 to 1.9 g/cm3, the true specific gravity being measured with nitrogen gas, a pore volume of 0.1 mL/g or lower, an Na content of 10 ppm or lower, and a true specific gravity retention rate of 80% or higher, the true specific gravity retention rate being measured with nitrogen gas and being a rate between before and after pressurization is performed at 300 MPa for 1 minute, and include, in an existence proportion of 60% or lower, particles in each of which a maximum value among major axes of internal voids is not smaller than half a major axis of the particle.

Abstract: A method for producing spherical silica particles according to the present disclosure includes: a raw material silica particle preparation step of preparing a liquid dispersion of raw material silica particles from a raw material solution obtained by dissolving silicic acid in a mixed solvent of water and an organic solvent in the presence of a basic substance; and a heating step of heating the liquid dispersion or the raw material silica particles so as to remove an organic substance contained in the liquid dispersion, thereby preparing spherical silica particles. The mixed solvent has a relative permittivity of 21 or higher and 40 or lower, and a quaternary ammonium derived from the basic substance is blended in a blending ratio of 0.3 or higher and 0.8 or lower in terms of molar ratio with respect to a silicon element derived from the silicic acid.

Abstract: An object is to provide a production method that is a method for producing a spherical particle material by a melting method and that makes a melting spheroidization ratio higher than the conventional method. A production method for a spherical particle material of the present disclosure achieving the above object includes: a raw particle material preparation step of preparing a raw particle material composed of an inorganic material; and a spheroidization step of feeding the raw particle material into a high-temperature atmosphere to melt the raw particle material and then rapidly cooling the raw particle material to prepare a spherical particle material having a volume average particle diameter of 1 ?m or more and less than 10 ?m, and a powder compressibility evaluation FF value, by a powder rheometer, of the raw particle material is 2.0 or more.

Abstract: A particle material that has high dispersibility in a dispersion medium such as toluene having high hydrophobicity, and a slurry composition in which the particle material is used, are provided for solving the problem. A surface-modified particle material of the present invention includes: a particle material formed of an inorganic material; and a surface treatment agent formed of a silane compound having a first functional group that has any of C, N, and O atoms away over five or more atoms from Si to which an alkoxide is bound, the surface treatment agent allowing surface treatment of the particle material in such an amount that a degree of hydrophobicity becomes not less than 30%. Dispersibility is enhanced also in a dispersion medium having high hydrophobicity in a case where a functional group having a predetermined structure is introduced so as to impart predetermined or higher hydrophobicity.

Abstract: An object of the present invention is to provide a composite oxide particle material formed of zinc molybdate having a high purity and a high circularity. The composite oxide particle material is formed of a composite oxide, of molybdenum and zinc, having an average particle diameter of 0.1 ?m or more and 5.0 ?m or less, a BET specific surface area of 1 m2/g or more and 20 m2/g or less, (peak intensity at 26.6° according to XRD)/(peak intensity at 24.2°) of 1.20 or more, an impurity concentration of 1 mass % or less, and a circularity of 0.90 or more. XRD is measured with CuK? radiation.

Abstract: A filler for electronic material according to the present invention has a silica particle material produced by a dry method, wherein D50 is 0.2 ?m or greater and 7.0 ?m or less. Further, in the filler for electronic material according to the present invention, (BET specific surface area)/(theoretical specific surface area calculated from D50) is 0.85 or greater and 1.2 or less (requirement 1), and/or D10/D50 is 0.55 or greater and 0.75 or less (requirement 2). When at least one of the requirements 1 and 2 is satisfied, electric characteristics such as a Df value are improved. Here, the BET specific surface area is a value measured by using nitrogen, and D50 is a 50 mass % cumulative diameter, i.e., a median diameter, and means a particle diameter at 50 mass % when the masses of particles are sequentially integrated from smaller particle diameters. Similarly, D10 is a 10 mass % cumulative diameter.

Abstract: Provided is a particle material that achieves excellent mechanical properties and optical properties when dispersed in a transparent resin material in order to solve the problem. In a case where primary particles having particle sizes in a certain range are formed into an aggregate, mechanical properties are enhanced while optical properties are maintained. The primary particles each have compositions different between the inside thereof and the surface thereof. Therefore, the optical properties to be obtained are easily controlled unlike an inorganic substance in which both of the compositions are mixed at an atomic level. The particle material of the present invention is an aggregate including primary particles in which a specific surface area. diameter is not less than 0.8 nm and not greater than 80 nm, the primary particles formed of an inorganic substance in which a composition of a surface and a composition of an inside are different.

Abstract: Provided is a ferrule polishing material suitable for polishing a ferrule. A ferrule polishing material of the present invention solving the above object includes a binder formed from a resin material and abrasive grains dispersed in the binder. The resin material is formed from an epoxy resin. The abrasive grains are contained in an amount of not less than 80% and not greater than 91% with respect to the sum of masses of the abrasive grains and the binder, include small-diameter particles being particles having a particle diameter of not greater than 100 nm, the small-diameter particles being present in an amount of not less than 62.5% and not greater than 80% with respect to the mass of the abrasive grains, and are formed from silica.