Abstract: The present invention relates to a silica particle dispersion including spherical silica particles and a solvent, in which the spherical silica particles have a median diameter d50 of 0.5 ?m to 20 ?m, and a product A×d50 of 2.7 ?m·m2/g to 5.0 ?m·m2/g, the product A×d50 being a product of a specific surface area A (m2/g) of the spherical silica particles and the median diameter d50 (?m).

Abstract: The present invention relates to a silica particle dispersion including: hollow silica particles; and a solvent, in which the hollow silica particles have an average particle diameter in a range of 0.2 ?m to 10 ?m. The present invention relates to the silica particle dispersion in which the hollow silica particles have a particle density of 0.35 g/cm3 to 2.00 g/cm3, the particle density being determined by density measurement with a dry pycnometer using argon gas.

Abstract: Provided are: a liquid composition containing a thermosetting resin and silica particles, the silica particles (1) having a specific water vapor adsorption amount and a specific moisture retention variation, (2) having a specific charge amount and a specific d50, and (3) having a specific powder friction angle, a specific d50, and a specific aggregation state; a prepreg, a metal substrate with a resin, and a wiring board using the liquid composition; and silica particles used in the liquid composition.

Abstract: A liquid composition containing a thermosetting resin and silica particles, in which (1) the d50 and specific surface area of the silica particles are within a particular range, and the viscosity of the composition is within a particular range, (2) the d50 of the silica particles and the product of the specific surface area and the d50 are in particular ranges, and the liquid composition further contains a solvent having a specific surface tension, (3) the d50/d10 of the silica particles is in a particular range, the liquid composition further contains a solvent having a specific boiling point and a specific evaporation rate, and the thixotropy ratio of the composition is in a specific range, or (4) the proportion of silica particles having a particle diameter of 10 ?m or more, the coefficient of variation of particle diameter, and the d50 are within particular ranges; and applications thereof.

Abstract: A liquid composition containing a thermosetting resin, first silica particles, second silica particles, and a solvent, in which the first silica particles have a median diameter d50 of from 1.5 ?m to 20.0 ?m, the product of a specific surface area and the median diameter d50 being from 2.7 to 5.0 ?m m2/g, and the second silica particles have a median diameter d50 of from 0.3 ?m to less than 1.5 ?m; and a prepreg, a metal substrate with a resin, and a wiring board using the same are provided.

Abstract: To provide hollow silica particles having a dense silica shell layer. A method for producing hollow silica particles, which comprises: adjusting the pH of an oil-in-water emulsion containing an aqueous phase, an oil phase and a surfactant to at most 3.0 and adding a first silica material to the oil-in-water emulsion, adding a second silica material to the emulsion having the first silica material added, at its pH of at least 8, in the presence of alkali metal ions, to obtain a hollow silica precursor dispersion, and obtaining a hollow silica precursor from the hollow silica precursor dispersion and obtaining hollow silica particles from the hollow silica precursor.

Abstract: The present invention relates to hollow silica particles each including a shell layer that includes silica and having a space portion inside the shell layer, in which when A (g/cm3) is a particle density determined by density measurement with a dry pycnometer using argon gas and B (m2/g) is a BET specific surface area, the hollow silica particles have a product (A×B) of the particle density and the BET specific surface area of 1 m2/cm3 to 120 m2/cm3.

Abstract: The present invention relates to a spherical silica powder, having a median diameter d50 of 0.5 ?m to 20 ?m, and a product A×d50, which is a product of a specific surface area A (m2/g) and the median diameter d50 (?m), of 2.7 ?m·m2/g to 5.0 ?m·m2/g. The spherical silica powder may have a dielectric loss tangent of 0.0020 or less at a frequency of 1 GHz.

Abstract: The present invention relates to light-scattering silica particles having a light scattering property, the light-scattering silica particles including: a plurality of hollow portions each having a closed pore structure inside the particle, in which the light-scattering silica particles have a volume-based cumulative 50% particle diameter of 1 ?m to 500 ?m and an average circularity of 0.80 or more, and in use of the light-scattering silica particles, a reflectance A of a water cake containing 20 mg/cm2 of silica per measurement cross-sectional area at an ultraviolet wavelength of 310 nm is 30% or more.

Abstract: The present invention relates to hydrophobic silica particles including silica particles each being impregnated with a higher alcohol having 19 or more carbon atoms, and having a binding degree of the higher alcohol to the silica particles of 70% or more measured by the following measuring method: the measuring method: 1 g of the hydrophobic silica particles is dispersed in 10 mL of tetrahydrofuran, and after maintaining the dispersed state for 5 minutes, a filtered residue is washed with 20 mL of tetrahydrofuran and 20 mL of hexane and dried, and a ratio, represented by Equation (1), of a carbon content of the hydrophobic silica particles after washing to a carbon content of the hydrophobic silica particles before washing is defined as the binding degree, binding degree (%)=carbon content (%) of hydrophobic silica particles after washing/carbon content (%) of hydrophobic silica particles before washing×100 (1).

Abstract: The present invention relates to an adsorbent including: an inorganic porous body; and an amine compound, in the inorganic porous body has an oil absorption value of 230 ml/100 g or more, and a peak diameter of a pore size, which is obtained based on a nitrogen adsorption method, of 20 nm or more and 100 nm or less. The present invention relates to an adsorbent including: an inorganic porous body; and an amine compound, in which the inorganic porous body has a pore volume of 1.2 cm3/g or more and 3.5 cm3/g or less, and a peak diameter of a pore size, which is obtained based on a nitrogen adsorption method, of 20 nm or more and 100 nm or less.

Abstract: To provide hollow silica particles having a dense silica shell layer. A method for producing hollow silica particles, which comprises: adjusting the pH of an oil-in-water emulsion containing an aqueous phase, an oil phase and a surfactant to at most 3.0 and adding a first silica material to the oil-in-water emulsion, adding a second silica material to the emulsion having the first silica material added, at its pH of at least 8, in the presence of alkali metal ions, to obtain a hollow silica precursor dispersion, and obtaining a hollow silica precursor from the hollow silica precursor dispersion and obtaining hollow silica particles from the hollow silica precursor.

Abstract: To provide hollow silica particles having a dense silica shell layer. A method for producing hollow silica particles, which comprises: adjusting the pH of an oil-in-water emulsion containing an aqueous phase, an oil phase and a surfactant to at most 3.0 and adding a first silica material to the oil-in-water emulsion, adding a second silica material to the emulsion having the first silica material added, at its pH of at least 8, in the presence of alkali metal ions, to obtain a hollow silica precursor dispersion, and obtaining a hollow silica precursor from the hollow silica precursor dispersion and obtaining hollow silica particles from the hollow silica precursor.

Abstract: The present invention relates to a hydroxyapatite-supporting porous silica particle, in which hydroxyapatite is supported on a surface a spherical porous silica particle and inner surfaces of pores of the spherical porous silica particle, and in which the hydroxyapatite-supporting porous silica particle has a circularity of 0.760 or larger, a method for producing the hydroxyapatite-supporting porous silica particles, and a composition containing the hydroxyapatite-supporting porous silica particle.

Abstract: The present invention related to a hollow silica particle including: a shell layer containing silica; and a space formed inside the shell layer, in which the hollow silica particle has a particle density as measured by a dry pycnometer density measurement using helium gas of 2.00 g/cm3 or more and a particle density as measured by a dry pycnometer density measurement using oxygen gas of lower than 2.00 g/cm3.

Abstract: The present invention relates to hollow silica particles, which each includes a shell layer containing silica and a space inside the shell layer, in which the hollow silica particles have a peak intensity derived from SiOH at a wavenumber of around 3,746 cm?1 of 0.60 or less by infrared spectroscopy, a relative permittivity at 1 GHz of from 1.3 to 5.0 and a dielectric loss tangent at 1 GHz of from 0.0001 to 0.05.

Abstract: To provide hollow silica particles having a dense silica shell layer. A method for producing hollow silica particles, which comprises: adjusting the pH of an oil-in-water emulsion containing an aqueous phase, an oil phase and a surfactant to at most 3.0 and adding a first silica material to the oil-in-water emulsion, adding a second silica material to the emulsion having the first silica material added, at its pH of at least 8, in the presence of alkali metal ions, to obtain a hollow silica precursor dispersion, and obtaining a hollow silica precursor from the hollow silica precursor dispersion and obtaining hollow silica particles from the hollow silica precursor.

Abstract: To provide a porous silica having high alkali resistance; and a chromatographic carrier using such a porous silica. A porous silica comprising a phosphorus oxide component and a zirconium oxide component, wherein the amount of phosphorus atoms per unit specific surface area of the porous silica is from 1 ?mol/m2 to 25 ?mol/m2; and the amount of zirconium atoms per unit specific surface area of the porous silica is from 1 ?mol/m2 to 15 ?mol/m2. And, a chromatographic carrier which contains a ligand immobilized to such a porous silica.

Abstract: To provide an affinity carrier with a low pressure loss and a large binding capacity even when the linear flow rate of a solution to be made to pass therethrough is high. Silica spheres, which satisfy the following conditions: (a) the average particle size is from 30 ?m to 40 ?m as measured by a laser light scattering method; (b) the ratio (D10/D90) of the particle size (D10) of smaller 10% cumulative volume to the particle size (D90) of 90% cumulative volume in a particle size distribution as measured by a Coulter counter method, is at most 1.50; and (c) the average pore size is from 85 nm to 115 nm and the pore volume is at least 1.5 mL/g, as measured by a mercury intrusion technique.

Abstract: To provide an affinity carrier with a low pressure loss and a large binding capacity even when the linear flow rate of a solution to be made to pass therethrough is high. Silica spheres, which satisfy the following conditions: (a) the average particle size is from 30 ?m to 40 ?m as measured by a laser light scattering method; (b) the ratio (D10/D90) of the particle size (D10) of smaller 10% cumulative volume to the particle size (D90) of 90% cumulative volume in a particle size distribution as measured by a Coulter counter method, is at most 1.50; and (c) the average pore size is from 85 nm to 115 nm and the pore volume is at least 1.5 mL/g, as measured by a mercury intrusion technique.