Abstract: The magnetic recording medium has an arithmetic average roughness Ra of a surface of a magnetic layer is 2.2 nm or less, a fluorine concentration A obtained by X-ray photoelectron spectroscopy performed on a surface of the magnetic layer at a photoelectron take-off angle of 10 degrees being 5 atom % or more and 50 atom % or less, and B, which is calculated by Equation 1 from an integrated intensity Ftotal of fragments derived from a fluorine-containing compound obtained for an entire region in a thickness direction of a cross section of the magnetic layer by line profile analysis of TOF-SIMS and an integrated intensity Fupper of fragments derived from a fluorine compound obtained for a region from the surface of the magnetic layer to an intermediate thickness in the thickness direction of the cross section, being 60% or more and 95% or less, Equation 1:B=(Fupper/Ftotal)×100.

Abstract: Provided is a magnetic tape in which a vertical direction squareness ratio and/or a longitudinal direction squareness ratio obtained by measurement performed by sweeping an external magnetic field in the magnetic tape in a predetermined range by a vibrating sample magnetometer is 0.70 to 1.00, and A calculated by Expression 1 is equal to or smaller than 5.0%. In Expression 1, n represents the number of measurement points measured at magnetic field strength of ?40 kA/m to 40 kA/m during the sweeping and is 52, Mr(Hex) represents a magnetization quantity measured at magnetic field strength Hex, and ? represents an arithmetical mean of Mr(Hex) obtained by measurement performed in the range of the magnetic field strength during the sweeping.

Abstract: Provided is a magnetic tape in which a vertical direction squareness ratio and/or a longitudinal direction squareness ratio obtained by measurement performed by sweeping an external magnetic field in the magnetic tape in a predetermined range by a vibrating sample magnetometer is 0.70 to 1.00, and A calculated by Expression 1 is equal to or smaller than 5.0%. In Expression 1, n represents the number of measurement points measured at magnetic field strength of ?40 kA/m to 40 kA/m during the sweeping and is 52, Mr(Hex) represents a magnetization quantity measured at magnetic field strength Hex, and ? represents an arithmetical mean of Mr(Hex) obtained by measurement performed in the range of the magnetic field strength during the sweeping.

Abstract: It is an object of the present invention to provide a sliding bearing which has a simple construction and thus can be produced easily and at a low cost and yet eliminates the need for the use of a heat insulation sleeve and the like and is capable of maintaining a frictional torque to a low extent. A sliding bearing (1) has an inner ring (2), an outer ring (3), and a sliding contact member (4) interposed therebetween. The inner ring (2) has a curved surface (2a) formed along an outer circumference thereof and a shaft-receiving hole which fits on a supporting shaft along an inner circumference thereof. The sliding contact member (4) is a molded body, made of resin composition, which has a curved surface (4a) making sliding contact with the curved outer circumferential surface (2a) of the inner ring (2) with the curved surface (4a) being opposed to the curved outer circumferential surface (2a).

Abstract: It is an object of the present invention to provide a sliding bearing which has a simple construction and thus can be produced easily and at a low cost and yet eliminates the need for the use of a heat insulation sleeve and the like and is capable of maintaining a frictional torque to a low extent. A sliding bearing (1) has an inner ring (2), an outer ring (3), and a sliding contact member (4) interposed therebetween. The inner ring (2) has a curved surface (2a) formed along an outer circumference thereof and a shaft-receiving hole which fits on a supporting shaft along an inner circumference thereof. The sliding contact member (4) is a molded body, made of resin composition, which has a curved surface (4a) making sliding contact with the curved outer circumferential surface (2a) of the inner ring (2) with the curved surface (4a) being opposed to the curved outer circumferential surface (2a).

Abstract: The present invention provides a method of initializing a perpendicular magnetic recording medium in which a magnetic field having a magnetic field strength Hex is applied to a perpendicular magnetic recording medium having a magnetic layer having a coercive force Hc to initialize the magnetic layer, the method comprising the steps of: controlling a magnetic field strength HexP in a direction parallel to the medium surface of the magnetic field so that HexP>1.3×Hc; and controlling a magnetic field strength HexV in a direction perpendicular to the medium surface of the magnetic field so that HexV<Hc.

Abstract: The present invention provides a method of initializing a perpendicular magnetic recording medium in which a magnetic field having a magnetic field strength Hex is applied to a perpendicular magnetic recording medium having a magnetic layer having a coercive force Hc to initialize the magnetic layer, the method comprising the steps of: controlling a magnetic field strength HexP in a direction parallel to the medium surface of the magnetic field so that HexP>1.3×Hc; and controlling a magnetic field strength HexV in a direction perpendicular to the medium surface of the magnetic field so that HexV<Hc.

Abstract: An electroconductive grease-filled bearing is a rolling bearing comprising an inner race 11 and an outer race 12, both of the races being coaxially provided, a plurality of steel balls 13 radially being retained between track surfaces of the races, the bearing rotatably supporting the edge of heating roll 6a in the fixing section of an electrostatic transfer copying machine, fixed to the inner periphery of inner race 11, an electroconductive grease to be filled between the track surfaces comprising a fluorocarbon oil as a base oil and graphite (or together with polytetrafluoroethylene) as a thickening agent. The electroconductive grease has a distinguished electroconductance so as to effectively discharge the static electricity, and has a distinguished heat-resistant durability even at elevated temperatures, and also prevents revolution failure due to the increased torque caused by an excessive lowering in the grease consistency, while maintaining the good electroconductance.

Abstract: An electroconductive grease-filled bearing is a rolling bearing comprising an inner race 11 and an outer race 12, both of the races being coaxially provided, a plurality of steel balls 13 radially being retained between track surfaces of the races, the bearing rotatably supporting the edge of heating roll 6a in the fixing section of an electrostatic transfer copying machine, fixed to the inner periphery of inner race 11, an electroconductive grease to be filled between the track surfaces comprising a fluorocarbon oil as a base oil and graphite (or together with polytetrafluoroethylene) as a thickening agent. The electroconductive grease has a distinguished electroconductance so as to effectively discharge the static electricity, and has a distinguished heat-resistant durability even at elevated temperatures, and also prevents revolution failure due to the increased torque caused by an excessive lowering in the grease consistency, while maintaining the good electroconductance.

Abstract: Disclosed is a lubricating composition such as a lubricant, a lubricating grease, or a rust preventive oil for use in a torque limiter and a ball-and-roller bearing; the lubricating composition having chemical attack resistance for a synthetic resin molded product. The lubricating composition comprises as a base oil at least one synthetic saturated hydrocarbon oil selected from the group consisting of a poly-&agr;-olefin, and an ethylene-&agr;-olefin copolymer. When a phosphoric acid ester is used as a compounding agent, or at lease one lubricating grease selected from the group consisting of an urea compound, silica powder, and bentonite powder is mixed therein, the lubricating composition is a rust preventive oil using a metal salt of sulfonic acid and the like. The lubricating composition is suitably used for machine parts of a business machine including the synthetic resin molded product.

Abstract: Disclosed is a lubricating composition such as a lubricant, a lubricating grease, or a rust preventive oil for use in a torque limiter and a ball-and-roller bearing; the lubricating composition having chemical attack resistance for a synthetic resin molded product. The lubricating composition comprises as a base oil at least one synthetic saturated hydrocarbon oil selected from the group consisting of a poly-&agr;-olefin, and an ethylene-&agr;-olefin copolymer. When a phosphoric acid ester is used as a compounding agent, or at lease one lubricating grease selected from the group consisting of an urea compound, silica powder, and bentonite powder is mixed therein, the lubricating composition is a rust preventive oil using a metal salt of sulfonic acid and the like. The lubricating composition is suitably used for machine parts of a business machine including the synthetic resin molded product.