Abstract: Provided are a crystalline silicon nitride powder for a siliconitride phosphors, which is used as a starting material for producing a siliconitride phosphor containing a silicon element and a nitrogen element but no oxygen element as a constitutent element, an oxygen content of the silicon nitride phosphor being 0.2-0.8 wt %; a CaAlSiN3 phosphor, an Sr2Si5N8 phosphor, an (Sr, Ca)AlSiN3 phosphor and an La3Si6N11 phosphor, each using the silicon nitride powder; and a method for producing the phosphors.

Abstract: Provided is a silicon nitride powder for siliconitride phosphor having high luminance, a Sr3Al3Si13O2N21 phosphor and a ?-Sialon phosphor using the powder, which can be used for vacuum fluorescent displays (VFDs), field emission displays (FEDs), plasma display panels (PDPs), cathode ray tubes (CRTs), light emitting diodes (LEDs), or the like, and processes for producing these phosphors. The silicon nitride powder for the siliconitride phosphors is a crystalline silicon nitride powder for use as a raw material for producing siliconitride phosphors including a silicon element, a nitrogen element, and an oxygen element, and has an average particle diameter of 1.0 to 12 ?m and an oxygen content of 0.2 to 0.9% by weight.

Abstract: There may be provided a process for producing a polyimide siloxane solution composition having a further improved long-term viscosity stability; and a polyimide siloxane solution composition. In the process for producing the polyimide siloxane solution composition by polymerizing/imidizing a tetracarboxylic acid component and a diamine component consisting of (a) a diaminopolysiloxane, (b) a diamine having a polar group and (c) a diamine other than (a) and (b) in a solvent, the tetracarboxylic acid component and the diamine component excluding (b) the diamine having a polar group are polymerized/imidized to provide a reaction mixture solution, and then (b) the diamine having a polar group is added to the reaction mixture solution last, and the mixture is polymerized/imidized.

Abstract: A polymer electrolyte composition of a sulfonated block copolymer (A) having a hydrophilic segment with a sulfonic acid group and a hydrophobic segment with no sulfonic acid group, each segment having an aromatic ring is its main chain, and an aromatic polymer (B) having no sulfonic acid group with a structural unit that is identical to the structural unit contained in the hydrophobic segment of the sulfonated block copolymer is provided. The ion-exchange capacity of the composition can be in a range of 0.5 mmol/g to 2.9 mmol/g. Electrolyte membranes, membrane/electrolyte assemblies, and electrolyte fuel cells utilizing the polymer electrolyte composition are also provide.

Abstract: Novel processes for preparing arylsulfur pentafluorides are disclosed. Processes include reacting at least one aryl sulfur compound with a halogen and a fluoro salt to form an arylsulfur halotetrafluoride. The arylsulfur halotetrafluoride is reacted with a fluoride source to form a target arylsulfur pentafluoride.

Abstract: A porous polyimide film having a three-layer structure that comprises two surface layers (a) and (b) and a macrovoid layer sandwiched between the surfaces layers (a) and (b). The macrovoid layer has a partition wall bonding to the surface layers (a) and (b), and multiple macrovoids each surrounded by the partition wall and the surface layers (a) and (b) and having a mean pore size in the film plane direction of from 10 to 500 ?m. The partition wall of the macrovoid layer has a thickness of from 0.1 to 50 ?m and has multiple pores having a mean pore size of from 0.01 to 50 ?m. The surface layers (a) and (b) each have a thickness of from 0.1 to 50 ?m, at least one of the surface layers has multiple pores having a mean pore size of from more than 5 ?m to 200 ?m, and the other surface layer has multiple pores having a mean pore size of from 0.01 to 200 ?m.

Abstract: Provided are a polycrystalline silicon ingot casting mold and a method for producing a polycrystalline silicon ingot casting mold, with which high-quality silicon ingots can be obtained at high yields by minimizing sticking with the surfaces of the silicon ingot casting mold, and losses and damages that occur when solidified silicon ingot is released from the mold. The method for producing a polycrystalline silicon ingot casting mold having a release layer, including: forming a slurry by mixing a silicon nitride powder with water, coating the surface of the mold with the slurry, and heating the mold at 400 to 800° C. in an atmosphere containing oxygen, after coating the slurry.

Abstract: This is to provide a polyamide resin which can sufficiently ensure all of a relative viscosity ?r (high degree of polymerization), moldable temperature range estimated from a temperature difference (Td?Tm), heat resistance estimated from a melting point Tm, melt moldability estimated from a temperature difference (Tm?Tc), and low water absorbability as compared with the conventional polyoxamide resin. This is a polyamide resin comprising a dicarboxylic acid-derived unit and a diamine-derived unit being bonded, wherein the above-mentioned dicarboxylic acid contains oxalic acid (Compound A), and the above-mentioned diamine contains 1,6-hexanediamine (Compound B) and 2-methyl-1,5-pentanediamine (Compound C).

Abstract: A method for producing an ?-sialon-based oxynitride phosphor includes a mixed powder blended such that the product is represented by the formula: MxSi12?(m+n)Al(m+n)OnN16?n:Lny (wherein M is at least one metal selected from Li, Ca, Mg, Y and a lanthanide metal excluding La and Ce, Ln is at least one lanthanide metal selected from Eu, Dy, Er, Tb and Yb), the mixed powder containing an amorphous silicon nitride powder having an loose bulk density of 0.16 to 0.22 g/cm3, and is fired at 1,400 to 2,000° C. in a nitrogen-containing inert gas atmosphere.

Abstract: A method of producing a silicon nitride powder includes heating an amorphous Si—N(—H)-based compound in which assuming that the specific surface area is RS (m2/g) and the oxygen content ratio is RO (mass %), RS/RO is 500 or more, at a temperature rising rate of 12 to 100° C./min in a temperature range from 1,000 to 1,400° C. while flowing the compound by a continuous firing furnace.

Abstract: A method for producing a high purity, high quality amide compound, particularly a lactam. An amount of each of a halide, an aldehyde compound, an alcohol compound and a nitrile compound contained in a solution recycled into an oxime-forming step is controlled to an amount of 0.4 mol% or less based on the ketone as a starting material. One or more of a ketone, an oxime and an amide compound are purified by hydrogenation and/or crystallization for eliminating impurities containing a double bond. A content of impurities having a cyclic bridge structure is controlled using a cycloalkanone purified by recrystallization.

Abstract: Provided are a ceramic composite for light conversion, which is capable of maintaining a high radiant flux even when the proportion of Gd and Ce is increased to tune the fluorescence peak wavelength to the longer wavelength side, a process for producing the ceramic composite, and a light emitting device including the ceramic composite.

Abstract: The present invention has an object to provide a method for efficiently producing high-purity 1,5-pentanediol by reacting tetrahydrofurfuryl alcohol with hydrogen. This manufacturing method for producing high-purity 1,5-pentanediol comprises: step (I): a step of obtaining a crude reaction product by a hydrogenolysis reaction of tetrahydrofurfuryl alcohol with hydrogen carried out in the presence of a copper-containing catalyst with reaction temperature of 200 to 350° C. and reaction pressure of 1 to 40 MPa until conversion rate of tetrahydrofurfuryl alcohol reaches 80% or less; step (II): a step of separating tetrahydrofurfuryl alcohol and crude 1,5-pentanediol (A) from the crude reaction product obtained in the step (I), and then, supplying recovered tetrahydrofurfuryl alcohol as a raw material for the step (I); and step (III): a step of obtaining the high-purity 1,5-pentanediol by distillation of the crude 1,5-pentanediol (A) obtained in the step (II).

Abstract: Useful processes for isolating the fluorinated products formed by reaction with 4-tert-butyl-2,6-dimethylphenylsulfur trifluoride (Fluolead) are disclosed. The processes comprise the conversion of the byproduct (formula I) to sulfinate ester (formula V), and to sulfonate eater (formula VI), and then to the water-soluble sulfonate salt (formula IV) in the presence of the fluorinated products.

Abstract: Useful processes for isolating the fluorinated products formed by reaction with 4-tert-butyl-2,6-dimethylphenylsulfur trifluoride (Fluolead) are disclosed. The processes comprise the conversion of the byproduct (formula I) to sulfinate ester (formula V), and to sulfonate eater (formula VI), and then to the water-soluble sulfonate salt (formula IV) in the presence of the fluorinated products.

Abstract: The processing method for a mixture according to the present invention is a method for processing a mixture having first particles made of a magnetic material or a nonmagnetic material and second particles made of a magnetic material or a nonmagnetic material wherein the second particles are mixed in a fluid medium containing the first particles, and comprises a dispersion step of dispersing aggregates of the first particles and the second particles present in the mixture, and a magnetic separation step of providing the first particles and second particles with a magnetic force a of different magnitudes by applying a magnetic field to the mixture in parallel with or after the dispersion step, thereby separating the first particles and the second particles from each other.

Abstract: A production process which comprises a preform formation step of forming a fiber preform made of silicon carbide short fibers having heat resistance of 1000° C. or greater; a sol-gel preparation step of preparing a sol-gel solution containing a heat resistant compound having heat resistance of 1000° C. or greater; an impregnation-drying-calcination step of impregnating the fiber preform with the sol-gel solution, followed by drying and calcining; and a crystallization step of crystallizing the fiber preform after impregnation, drying and calcination.

Abstract: An aqueous polyurethane resin dispersion containing a polyurethane resin obtained by reacting (A) a polyurethane prepolymer obtained by reacting (a) a polyisocyanate compound, (b) at least one polyol compound containing a polycarbonate polyol having a number average molecular weight of 400 to 3000, (c) an acidic group-containing polyol compound, (d) a blocking agent for an isocyanate group, which dissociates at 80 to 180° C., and (B) a chain elongating agent having reactivity with the isocyanate group, being dispersed in an aqueous medium, a sum of a content of urethane and urea bondings is 15 to 30% by weight in terms of solid components, a content of carbonate bondings is 8% to <15% by weight in terms of solid components, and a content of isocyanate group to which the above-mentioned blocking agent has bound is 0.2 to 3% by weight in terms of solid components as calculated on isocyanate group.

Abstract: Provided is a process for producing dense SiC fiber-bonded ceramics excellent in heat resistance and having a shape hard to form by hot pressing such as an elongated shape. The process for producing SiC fiber-bonded ceramics composed of: inorganic fiber made of SiC; and interfacial layers mainly made of carbon includes vacuum-sealing a preform, prepared by forming specific silicon carbide-based inorganic fiber into a certain shape, into a capsule and hot-isostatic-pressing the preform. The process is characterized in that the ratio of the number of carbon atoms to the number of silicon atoms in the preform is 1.02 to 1.20, and before the hot isostatic pressing, the preform is heated in an inert gas atmosphere or a reducing gas atmosphere at a temperature of 1200° C. to 1800° C. to adjust the oxygen content in the inorganic fiber to 6.0% by weight or lower, and then the hot isostatic pressing is carried out.

Abstract: Disclosed is a method for producing a polyimide film, wherein a polyamic acid solution composition is coated on a base material and the resultant coating film is processed by heat treatment; the polyamic acid solution composition is obtained by introducing a specific chemical structure into a polyamic acid at a ratio within a specific range; and the polyamic acid has a chemical structure composed of a 3,3?,4,4?-biphenyltetracarboxylic acid component and/or a pyromellitic acid component, and a paraphenylenediamine component. Also disclosed is the polyamic acid solution composition.