Abstract: An object of the present invention is to provide a catalyst that enables production of an unsaturated carboxylic acid and/or unsaturated carboxylic acid ester represented by methyl methacrylate with high selectivity. The object is achieved by a catalyst including: one or more elements selected from boron, magnesium, zirconium, hafnium, and titanium; one or more elements selected from alkali metal elements; and silica; the catalyst having a peak height ratio I2/I1 of 0 to 1.2, wherein I1 represents the peak height at 417±10 cm?1, and I2 represents the peak height at 1050±10 cm?1, as obtained by Raman spectroscopy.

Abstract: The present invention provides a curable composition allowing a cured product having high aesthetic quality, strength and durability along with having high surface lubricating property to be formed. The curable composition according to the present invention comprises: an inorganic powder and a polymerizable monomer. The inorganic powder contains a spherical crystallization control powder. The spherical crystallization control powder has a silicon dioxide content in the range of 97 to 100 mass %. An amorphous portion and a crystalline portion are mixed within the spherical crystallization control powder. A refractive index difference is not more than 0.05 between the spherical crystallization control powder and a cured product obtained by curing only constituents other than the spherical crystallization control powder.

Abstract: Dental molded product for milling having excellent aesthetic quality, compatibility for machine and moldability from the moldable composition is provided. The dental molded product for milling is obtained by curing the moldable composition which includes a polymerizable monomer, a polymerization initiator, a first spherical inorganic filler and a second spherical inorganic filler. An average particle size of the first spherical inorganic filler is in the range of 0.2 to 10 ?m. A content of the first spherical inorganic filler is in the range of 50 to 85 mass %. An average particle size of the second spherical inorganic filler is in the range of 0.005 to 0.1 ?m. A content of the second spherical inorganic filler is in the range of 1 to 18 mass %.

Abstract: The present invention provides a curable composition allowing a cured product having high aesthetic quality, strength and durability along with having high surface lubricating property. A curable composition in the present invention comprises: an inorganic powder and a polymerizable monomer, wherein the inorganic powder contains a spherical composite powder, the spherical composite powder has a complex of silicon dioxide and at least one of alumina and zirconia, and an amorphous part and a crystalline part are mixed in the spherical composite powder. A refractive index difference is not more than 0.05 between the spherical composite powder and a cured product obtained by curing only a compound excluded the spherical composite powder.

Abstract: The present invention provide the dental molded product for milling having the excellent aesthetic quality, compatibility for machine and moldability from the moldable composition. The dental molded product for milling in the present invention was obtained by curing the moldable composition which includes a polymerizable monomer, a polymerization initiator, a first spherical inorganic filler and a second spherical inorganic filler. An average particle size of the first spherical inorganic filler is in the range of 0.2 to 10 micro m. A content of the first spherical inorganic filler is in the range of 50 to 85 mass %. An average particle size of the second spherical inorganic filler is in the range of 0.005 to 0.1 micro m. A content of the second spherical inorganic filler is in the range of 1 to 18 mass %.

Abstract: The present invention provides a curable composition allowing a cured product having high aesthetic quality, strength and durability along with having high surface lubricating property. A curable composition in the present invention comprises: an inorganic powder and a polymerizable monomer, wherein the inorganic powder contains a spherical composite powder, the spherical composite powder has a complex of silicon dioxide and at least one of alumina and zirconia, and an amorphous part and a crystalline part are mixed in the spherical composite powder. A refractive index difference is not more than 0.05 between the spherical composite powder and a cured product obtained by curing only a compound excluded the spherical composite powder.

Abstract: The present invention provides a curable composition allowing a cured product having high aesthetic quality, strength and durability along with having high surface lubricating property to be formed. The curable composition according to the present invention comprises: an inorganic powder and a polymerizable monomer. The inorganic powder contains a spherical crystallization control powder. The spherical crystallization control powder has a silicon dioxide content in the range of 97 to 100 mass %. An amorphous portion and a crystalline portion are mixed within the spherical crystallization control powder. A refractive index difference is not more than 0.05 between the spherical crystallization control powder and a cured product obtained by curing only constituents other than the spherical crystallization control powder.

Abstract: A hydrogen generator (100a) includes: a heater (1) which combusts a mixture gas of combustion fuel and combustion air to generate a combustion gas; a preheat evaporator (6) which heats a raw material and water by the combustion gas generated by the heater to generate a mixture gas of the raw material and the water; a reformer (2) which generates a hydrogen-containing gas by causing the mixture gas generated by the preheat evaporator to pass through a reforming catalyst (2a) heated by the combustion gas; and a shift converter (3) which incorporates a shift catalyst (3a) which reduces, by a shift reaction, carbon monoxide contained in the hydrogen-containing gas generated by the reformer, and further includes a water trapping portion (7) which traps liquid water discharged from the preheat evaporator, and the hydrogen generator (100a) is configured to carry out heat exchange between the hydrogen-containing gas supplied from the reformer to the shift converter and the water in the water trapping portion.

Abstract: A hydrogen generator (100a) includes: a heater (1) which combusts a mixture gas of combustion fuel and combustion air to generate a combustion gas; a preheat evaporator (6) which heats a raw material and water by the combustion gas generated by the heater to generate a mixture gas of the raw material and the water; a reformer (2) which generates a hydrogen-containing gas by causing the mixture gas generated by the preheat evaporator to pass through a reforming catalyst (2a) heated by the combustion gas; and a shift converter (3) which incorporates a shift catalyst (3a) which reduces, by a shift reaction, carbon monoxide contained in the hydrogen-containing gas generated by the reformer, and further includes a water trapping portion (7) which traps liquid water discharged from the preheat evaporator, and the hydrogen generator (100a) is configured to carry out heat exchange between the hydrogen-containing gas supplied from the reformer to the shift converter and the water in the water trapping portion.