Abstract: A multifunctional, high-performance hydrocarbon composition is demanded.

Abstract: The present invention provides: a carbon fiber sizing agent that can obtain a carbon fiber bundle having a superior effect of improving mechanical properties when composited using a resin; an aqueous dispersion thereof; a carbon fiber bundle; a sheet-shaped article having a carbon fiber bundle; and a composite material. The carbon fiber sizing agent contains: a compound (A) that is an ester of an unsaturated monobasic acid and an epoxy compound having a plurality of epoxy groups in the molecule, and that has at least one epoxy group in the molecule; a urethane acrylate oligomer (B) that is bifunctional and that has a tensile elongation rate of the cured product of at least 40%; and a polyurethane resin (C) having a tensile elongation rate of a dried coating film of 350-900% inclusive. The amounts of A-C contained satisfy the conditions described in the description. The aqueous dispersion disperses the sizing agent. The carbon fiber bundle contains 0.6-3.0 mass % inclusive of the sizing agent.

Abstract: Provided is a carbon fiber manufacturing method including a surface treatment step of ejecting an ozone solution in which ozone is dissolved in solvent from a fluid ejecting port toward a carbon fiber bundle and causing the ozone solution to pass between single fibers of the carbon fiber bundle so as to contact surfaces of the single fibers so that the surfaces of carbon fibers are treated by the ozone solution. Also, provided is a carbon fiber subjected to a surface treatment by the carbon fiber manufacturing method.

Abstract: Provided are: a carbon fiber bundle which has a large value of single-fiber fineness and excellent productivity and which, despite this, contains few interlaced single fibers therein and has excellent spreadability; and precursor fibers which are suitable for use in producing the carbon fiber bundle. The precursor fibers are a carbon-fiber-precursor acrylic fiber bundle which comprises a polyacrylonitrile copolymer comprising 95-99 mol % acrylonitrile units and 1-5 mol % hydroxyalkyl (meth)acrylate units and which has a single-fiber fineness of 1.5-5.0 dtex. In the acrylic fiber bundle, the cross-section of each single fiber which is perpendicular to the fiber axis has a shape that has a roundness of 0.9 or less.

Abstract: The present invention provides a refrigerating machine oil, a compressor oil composition, a hydraulic oil composition, a metalworking oil composition, a heat treating oil composition, a lubricating oil composition for machine tools and a lubricating oil composition which comprise a lubricating oil base oil having % CA of not more than 2, % CP/% CN of not less than 6 and an iodine value of not more than 2.5.

Abstract: The present invention provides a refrigerating machine oil, a compressor oil composition, a hydraulic oil composition, a metalworking oil composition, a heat treating oil composition, a lubricating oil composition for machine tools and a lubricating oil composition which comprise a lubricating oil base oil having % CA of not more than 2, % CP/% CN of not less than 6 and an iodine value of not more than 2.5.

Abstract: The present invention provides a method of minimal quantity lubrication cutting and grinding that can improve cutting and grinding properties and extend the life of tools. The minimal quantity lubrication cutting and grinding method of the present invention comprises supplying a compressed fluid containing 0.1 to 15 percent by volume of oxygen together with a cutting and grinding oil (particularly preferably an oil composition comprising an ester) to processing spots of a workpiece.

Abstract: The present invention provides a refrigerating machine oil, a compressor oil composition, a hydraulic oil composition, a metalworking oil composition, a heat treating oil composition, a lubricating oil composition for machine tools and a lubricating oil composition which comprise a lubricating oil base oil having % CA of not more than 2, % CP/% CN of not less than 6 and an iodine value of not more than 2.5.

Abstract: The present invention provides a refrigerating machine oil, a compressor oil composition, a hydraulic oil composition, a metalworking oil composition, a heat treating oil composition, a lubricating oil composition for machine tools and a lubricating oil composition which comprise a lubricating oil base oil having % CA of not more than 2, % CP/% CN of not less than 6 and an iodine value of not more than 2.5.

Abstract: The present invention provides a refrigerating machine oil, a compressor oil composition, a hydraulic oil composition, a metalworking oil composition, a heat treating oil composition, a lubricating oil composition for machine tools and a lubricating oil composition which comprise a lubricating oil base oil having % CA of not more than 2, % CP/% CN of not less than 6 and an iodine value of not more than 2.5.

Abstract: The present invention provides a refrigerating machine oil, a compressor oil composition, a hydraulic oil composition, a metalworking oil composition, a heat treating oil composition, a lubricating oil composition for machine tools and a lubricating oil composition which comprise a lubricating oil base oil having % CA of not more than 2, % CP/% CN of not less than 6 and an iodine value of not more than 2.5.

Abstract: The present invention provides a refrigerating machine oil, a compressor oil composition, a hydraulic oil composition, a metalworking oil composition, a heat treating oil composition, a lubricating oil composition for machine tools and a lubricating oil composition which comprise a lubricating oil base oil having % CA of not more than 2, % CP/% CN of not less than 6 and an iodine value of not more than 2.5.

Abstract: Provided is a carbon fiber bundle for obtaining a fiber-reinforced plastic having high mechanical characteristics. An acrylonitrile swollen fiber for a carbon fiber having openings of 10 nm or more in width in the circumference direction of the swollen fiber at a ratio in the range of 0.3 openings/?m2 or more and 2 openings/?m2 or less on the surface of the swollen fiber, and the swollen fiber is not treated with a finishing oil agent. A precursor fiber obtained by treating the swollen fiber with a silicone-based finishing oil agent has a silicon content of 1700 ppm or more and 5000 ppm or less, and the silicon content is 50 ppm or more and 300 ppm or less after the finishing oil agent is washed away with methyl ethyl ketone by using a Soxhlet extraction apparatus for 8 hours. The fiber is preferably an acrylonitrile copolymer containing acrylonitrile in an amount of 96.0 mass % or more and 99.7 mass % or less and an unsaturated hydrocarbon having at least one carboxyl group or ester group in an amount of 0.

Abstract: Provided is a carbon fiber bundle for obtaining a fiber-reinforced resin having high mechanical characteristics. A carbon fiber bundle formed of single carbon fibers, each of which has no uneven surface structure of 0.6 ?m or more in length extending in the longitudinal direction of the single fiber; which has an uneven structure having a difference in height (Rp?v) of 5 to 25 nm between the highest portion and the lowest portion of the surface of the single fiber and having an average roughness Ra of 2 to 6 nm; and which has a ratio of the major axis to the minor axis (major axis/minor axis) of a cross-section of the single fiber of 1.00 to 1.01, wherein a mass of the single fiber per unit length falls within the range of 0.030 to 0.042 mg/m; a strand strength is 5900 MPa or more; a strand elastic modulus measured by the ASTM method is 250 to 380 GPa; and a knot tenacity is 900 N/mm2 or more.

Abstract: The present invention provides a refrigerating machine oil, a compressor oil composition, a hydraulic oil composition, a metalworking oil composition, a heat treating oil composition, a lubricating oil composition for machine tools and a lubricating oil composition which comprise a lubricating oil base oil having % CA of not more than 2, % CP/% CN of not less than 6 and an iodine value of not more than 2.5.

Abstract: The present invention provides a refrigerating machine oil, a compressor oil composition, a hydraulic oil composition, a metalworking oil composition, a heat treating oil composition, a lubricating oil composition for machine tools and a lubricating oil composition which comprise a lubricating oil base oil having % CA of not more than 2, % CP/% CN of not less than 6 and an iodine value of not more than 2.5.

Abstract: The present invention provides a refrigerating machine oil, a compressor oil composition, a hydraulic oil composition, a metalworking oil composition, a heat treating oil composition, a lubricating oil composition for machine tools and a lubricating oil composition which comprise a lubricating oil base oil having % CA of not more than 2, % CP/% CN of not less than 6 and an iodine value of not more than 2.5.

Abstract: The present invention provides a refrigerating machine oil, a compressor oil composition, a hydraulic oil composition, a metalworking oil composition, a heat treating oil composition, a lubricating oil composition for machine tools and a lubricating oil composition which comprise a lubricating oil base oil having % CA of not more than 2, % CP/% CN of not less than 6 and an iodine value of not more than 2.5.

Abstract: The present invention provides a refrigerating machine oil, a compressor oil composition, a hydraulic oil composition, a metalworking oil composition, a heat treating oil composition, a lubricating oil composition for machine tools and a lubricating oil composition which comprise a lubricating oil base oil having % CA of not more than 2, % CP/% CN of not less than 6 and an iodine value of not more than 2.5.

Abstract: The present invention provides a refrigerating machine oil, a compressor oil composition, a hydraulic oil composition, a metalworking oil composition, a heat treating oil composition, a lubricating oil composition for machine tools and a lubricating oil composition which comprise a lubricating oil base oil having % CA of not more than 2, % CP/% CN of not less than 6 and an iodine value of not more than 2.5.