Abstract: A method of producing a prepolymerized catalyst for olefin polymerization comprising a fine powder removal step of removing fine particles from olefin-prepolymerized catalyst particles for olefin polymerization. The prepolymerized catalyst having a low fine particle content is applicable suitably to the field of continuous polymerization of olefins.

Abstract: A cream solder obtained by kneading an Sn—Ag—Cu alloy together with a flux, wherein the Sn—Ag—Cu alloy includes a mixture of a first powdery alloy and a second powdery alloy, the first powdery alloy is represented by an Sn—Ag phase diagram having a solid-liquid coexistence region and has a given silver amount which is larger than that in the eutectic composition (3.5 wt. % silver), and the second powdery alloy has a silver amount which is that in the eutectic composition (3.5 wt. % silver) or which is close to that in the eutectic composition and is smaller than that in the first powdery alloy. This cream solder has excellent strength and thermal stability, and satisfactory bonding properties. It is based on an inexpensive Sn—Ag—Cu solder alloy. It is suitable for use as a high-temperature-side lead-free solder material conformable to temperature gradation bonding. Also provided is a method of soldering.

Abstract: A method of producing a prepolymerized catalyst for olefin polymerization comprising a fine powder removal step of removing fine particles from olefin-prepolymerized catalyst particles for olefin polymerization. The prepolymerized catalyst having a low fine particle content is applicable suitably to the field of continuous polymerization of olefins.

Abstract: The present invention relates to a reactor, a process for producing a prepolymerization catalyst for olefin polymerization, and a process for producing an olefin polymer. A reactor for producing a prepolymerization catalyst for olefin polymerization, said reactor comprising: a stirring blade; and a scraper, wherein said scraper is capable of scraping off a fouling adhered on an inner wall surface of the reactor, and a portion of the scraper for scraping off at least said fouling is made of a polyolefin.

Abstract: There is provided a process for producing a prepolymerization catalyst for polymerization of an olefin, said process comprising the steps of feeding, to a polymerization reactor, an olefin and a solid catalyst component in which a catalyst component for polymerization of the olefin is carried on a fine particle support, and prepolymerizing the olefin in the presence of the solid catalyst component in the polymerization reactor, to thereby obtain the prepolymerization catalyst in which the olefin is prepolymerized on the solid catalyst component, characterized in that said solid catalyst component is pressure-fed to the polymerization reactor from a catalyst feeder connected to the polymerization reactor, and in that the inner pressure of the catalyst feeder at the start of the pressure-feeding is set at (Pr+0.0001) to (Pr+1) (MPa in unit) (in which Pr represents the inner pressure of the polymerization reactor (MPa in unit) at the start of the pressure-feeding).

Abstract: A snap cage (5) includes an annular cage body having a plurality of pockets (11) defined therein at respective circumferential locations for retaining a corresponding number of balls. Each of the pockets (11) also has an inner face formed with a recessed area (16) extending from a pocket open edge on a cage inner diametric side towards a cage outer diametric side.

Abstract: A method of producing a prepolymerized catalyst for olefin polymerization comprising a fine powder removal step of removing fine particles from olefin-prepolymerized catalyst particles for olefin polymerization. The prepolymerized catalyst having a low fine particle content is applicable suitably to the field of continuous polymerization of olefins.

Abstract: A bearing for alternators and a bearing for pulleys for reducing hydrogen embrittlement or cracking is used when the bearing is in an environment having a severe condition, such as, when hydrogen is generated from grease or the like. The bearing includes a rolling element, an inner ring and an outer ring, and at least one of the rolling element, where the inner and outer rings have a nitrogen enriched layer containing austenite crystal grains having a grain size number exceeding 10.

Abstract: A bearing for alternators and a bearing for pulleys for reducing hydrogen embrittlement or cracking is used when the bearing is in an environment having a severe condition, such as, when hydrogen is generated from grease or the like. The bearing includes a rolling element, an inner ring and an outer ring, and at least one of the rolling element, where the inner and outer rings have a nitrogen enriched layer containing austenite crystal grains having a grain size number exceeding 10.

Abstract: The present invention provides a manufacturing method of a semiconductor module which enables the joining at a low temperature within a short time and can obtain more reliable joining portions by performing the joining without using a solder joining medium.

Abstract: The present invention provides a highly active process for producing an olefin polymer, comprising: the step (I) of preliminarily polymerizing an olefin at 65° C.

Abstract: In a method for producing an olefin polymer to polymerize olefin by supplying olefin and a catalyst for polymerizing olefin into a vapor-phase fluidized bed reactor, the method includes introducing a fluidity improving agent comprising a compound represented by the following formula into the vapor-phase fluidized bed reactor. [R—O—(AO)m—COO—]nY (wherein, R represents an alkyl group, an alkenyl group or an aryl group, AO represents an alkylene oxide group, m represents the average addition molar number of alkylene oxide, Y represents a hydrogen atom, an alkali metal atom, an alkaline earth metal atom or an ammonium group, and n represents the valence of Y.

Abstract: A compressor component incorporated into a compressor having a compressor body and a compressor pulley mechanism transmitting a driving force to the compressor body has an austenite grain with a grain size number falling within a range exceeding 10, a fracture stress value of at least 2650 MPa, or a hydrogen content of at most 0.5 ppm. This provides a compressor component and a compressor bearing with a long fatigue life, a high anti-crack strength, and a reduced secular dimensional variation.

Abstract: An ethylene-?-olefin copolymer containing monomer units derived from ethylene and monomer units of an ?-olefin having 3 to 20 carbon atoms and having a melt flow rate of from 0.01 to 100 g/10 min, an activation energy of flow of 50 kJ/mol or more, a molecular weight distribution measured by a gel permeation chromatography of 3 or more and minute defects of 2000/m2 or less in number, a process for producing the copolymer, and a molding of the copolymer.

Abstract: There is provided a process for producing a prepolymerization catalyst for polymerization of an olefin, said process comprising the steps of feeding, to a polymerization reactor, an olefin and a solid catalyst component in which a catalyst component for polymerization of the olefin is carried on a fine particle support, and prepolymerizing the olefin in the presence of the solid catalyst component in the polymerization reactor, to thereby obtain the prepolymerization catalyst in which the olefin is prepolymerized on the solid catalyst component, characterized in that said solid catalyst component is pressure-fed to the polymerization reactor from a catalyst feeder connected to the polymerization reactor, and in that the inner pressure of the catalyst feeder at the start of the pressure-feeding is set at (Pr+0.0001) to (Pr+1) (MPa in unit) (in which Pr represents the inner pressure of the polymerization reactor (MPa in unit) at the start of the pressure-feeding).

Abstract: The present invention provides a reliable and durable rolling bearing incorporated in various industrial machines, vehicles, and the like, having a sealing member which deteriorates to a low extent and maintains preferable sealing performance for a long time. The rolling bearing includes an inner ring; an outer ring; a plurality of rolling elements interposed between the inner ring and the outer ring; and the sealing member provided at an open portion which is disposed at both axial ends of the inner ring and the outer ring. The sealing member comprises a rubber molding that contacts at least water, an alkali solution, grease, or the like. The rubber molding is made of a vulcanizable fluororubber composition which comprises a copolymer containing tetrafluoroethylene; propylene; and a crosslinkable monomer which is an unsaturated hydrocarbon having two to four carbon atoms, in which a part of hydrogen atoms is substituted with fluorine atoms.

Abstract: The present invention provides a manufacturing method of a semiconductor module which enables the joining at a low temperature within a short time and can obtain more reliable joining portions by performing the joining without using a solder joining medium.

Abstract: The present invention provides an electronic part mounting method which enables joining of electrodes at a low temperature and within a short time, can obtain the high reliability and, further, enables joining at a fine pitch. In an electronic part mounting method which joins circuit electrodes which are formed over a circuit board and die electrodes which are formed over the electronic parts thus mounting the electronic parts on the circuit board, a low-melting-point metal layer is preliminarily formed over the circuit electrode and/or the die electrode and, thereafter, the circuit electrode and the die electrode are arranged to face each other and are heated and pressurized for melting low-melting-point metal thus diffusing the low-melting-point metal into the circuit electrode and the die electrode by solid-liquid diffusion.

Abstract: A process for producing a prepolymerization catalyst component which contains contacting a co-catalyst support (A), a metallocene compound (B) and an organoaluminum compound (C) to obtain a contact-treated product, and prepolymerizing an olefin in the presence of the said contact-treated product, the process containing the following steps (1), (2) and (3): step (1): a step of subjecting a saturated aliphatic hydrocarbon compound solvent containing the metallocene compound (B) to a heat treatment at 40° C. or higher; step (2): a step of subjecting the heat treatment product obtained by the heat treatment in the step (1) to a contact treatment with the co-catalyst support (A); and step (3): a step of subjecting the contact treatment product obtained by the contact treatment in the step (2) to a contact treatment with the organoaluminum compound (C).

Abstract: An ethylene-?-olefin copolymer containing monomer units derived from ethylene and monomer units of an ?-olefin having 3 to 20 carbon atoms and having a melt flow rate of from 0.01 to 100 g/10 min, an activation energy of flow of 50 kJ/mol or more, a molecular weight distribution measured by a gel permeation chromatography of 3 or more and minute defects of 2000/m2 or less in number, a process for producing the copolymer, and a molding of the copolymer.