Abstract: Provided is a technique related to oxidized carbon nanotubes having excellent dispersion stability and dispersibility in water. The oxidized carbon nanotubes include oxidized single-walled carbon nanotubes, have a ratio of the oxidized single-walled carbon nanotubes relative to the total number of oxidized carbon nanotubes of more than 50%, and have a BET specific surface area of 100 m2/g or less.

Abstract: An electromagnetic wave absorbing sheet includes a sheet-shaped fibrous substrate and a plurality of carbon nanotubes attached to the sheet-shaped fibrous substrate. The attached amount of the carbon nanotubes in the electromagnetic wave absorbing sheet is 5 mass % or more. The electromagnetic wave absorbing sheet has a surface resistance of 20 ?/sq. or more.

Abstract: An electromagnetic wave absorption material comprises: fibrous carbon nanostructures; and an insulating material, wherein a content C of the fibrous carbon nanostructures when a content of the insulating material is 100 parts by mass is 5 parts by mass or more and 15 parts by mass or less, or, in the case where the fibrous carbon nanostructures are fibrous carbon nanostructures that exhibit a convex upward shape in a t-plot obtained from an adsorption isotherm, the content C is 0.3 parts by mass or more and 0.8 parts by mass or less, and the electromagnetic wave absorption material absorbs an electromagnetic wave in a frequency domain of more than 20 GHz.

Abstract: Disclosed is a silicone rubber composition and a vulcanized product thereof, which show high levels of flexibility and electrical conductivity at the same time. The disclosed silicone rubber composition comprises a silicone rubber and fibrous carbon nanostructures including carbon nanotubes, wherein the fibrous carbon nanostructures exhibit a convex upward shape in a t-plot obtained from an adsorption isotherm. The disclosed vulcanized product is obtainable by vulcanization of the silicone rubber composition.

Abstract: Provided is a crosslinked rubber having excellent workability and heat resistance, and a crosslinkable rubber composition that can be used to form the crosslinked rubber. The crosslinkable rubber composition contains: a rubber including a carboxyl group-containing ethylenically unsaturated monomer unit; an amine-based crosslinking agent having a melting point of at least 50° C. and no higher than 180° C.; and one or more carbon nanotubes. The crosslinked rubber is obtainable through crosslinking of the crosslinkable rubber composition. The carbon nanotubes preferably have a BET specific surface area of from 600 m2/g to 2,000 m2/g.

Abstract: Provided are a shaped product having excellent heat resistance and a rubber composition with which the shaped product can be formed. The rubber composition contains a rubber including an ethylenically unsaturated monomer unit having at least one carboxyl group, a compound having at least one amino group and an aromatic condensed ring structure including at least three rings, and one or more carbon nanotubes. The shaped product is obtained through shaping of the rubber composition.

Abstract: Disclosed is a composite resin material which includes a fluororesin and fibrous carbon nanostructures, wherein the composite resin material has a fluororesin content of 70% by mass or more and a fibrous carbon nanostructure content of 0.01% to 0.5% by mass based on the amount of the fluororesin, and wherein when a 50 ?m thick shaped product obtained by shaping the composite resin material is observed with an optical microscope, the number of aggregates that contain the fibrous carbon nanostructures as a main component and have a diameter of 300 ?m or more is 3 or less in a 30 mm×30 mm field of view.

Abstract: An electromagnetic wave absorption material comprises: fibrous carbon nanostructures; and an insulating material, wherein a content C of the fibrous carbon nanostructures when a content of the insulating material is 100 parts by mass is 5 parts by mass or more and 15 parts by mass or less, or, in the case where the fibrous carbon nanostructures are fibrous carbon nanostructures that exhibit a convex upward shape in a t-plot obtained from an adsorption isotherm, the content C is 0.3 parts by mass or more and 0.8 parts by mass or less, and the electromagnetic wave absorption material absorbs an electromagnetic wave in a frequency domain of more than 20 GHz.

Abstract: Disclosed is a composite resin material which includes a fluororesin and fibrous carbon nanostructures, wherein the composite resin material has a fluororesin content of 70% by mass or more and a fibrous carbon nanostructure content of 0.01% to 0.5% by mass based on the amount of the fluororesin, and wherein when a 50 ?m thick shaped product obtained by shaping the composite resin material is observed with an optical microscope, the number of aggregates that contain the fibrous carbon nanostructures as a main component and have a diameter of 300 ?m or more is 3 or less in a 30 mm×30 mm field of view.

Abstract: A positive electrode for a secondary battery wherein the electrode includes a collector and a positive electrode active material layer which is stacked upon the collector, and which includes a positive electrode active material, a conductive agent, and a binder; the binder includes a first polymer and a second polymer; the first polymer is a fluorine-containing polymer; the second polymer includes a polymerized moiety having a nitrile group, a polymerized moiety having a hydrophilic group, a polymerized (meth)acrylic acid ester moiety, and a straight-chain polymerized alkylene moiety having a carbon number of at least 4; the proportion of the first polymer and the second polymer in the binder, expressed as a mass ratio, is in the range of 95:5 to 5:95.

Abstract: A cross-linked rubber is excellent in both fuel oil resistance and cold resistance. A cross-linkable rubber composition contains: a nitrile group-containing copolymer rubber [A] including less than 30 wt % ?,?-ethylenically unsaturated nitrile monomer units (a1), conjugated diene monomer units (b1), and ?,?-ethylenically unsaturated dicarboxylic acid monoester monomer units (d1), wherein at least part of the conjugated diene monomer units (b1) is hydrogenated; a nitrile group-containing copolymer rubber [B] including not less than 30 wt % ?,?-ethylenically unsaturated nitrile monomer units (a2) and conjugated diene monomer units (b2), wherein at least part of the conjugated diene monomer units (b2) may be hydrogenated; and an amine-based cross-linking agent.

Abstract: Disclosed is a silicone rubber composition and a vulcanized product thereof, which show high levels of flexibility and electrical conductivity at the same time. The disclosed silicone rubber composition comprises a silicone rubber and fibrous carbon nanostructures including carbon nanotubes, wherein the fibrous carbon nanostructures exhibit a convex upward shape in a t-plot obtained from an adsorption isotherm. The disclosed vulcanized product is obtainable by vulcanization of the silicone rubber composition.

Abstract: Provided is a crosslinked rubber having excellent workability and heat resistance, and a crosslinkable rubber composition that can be used to form the crosslinked rubber. The crosslinkable rubber composition contains: a rubber including a carboxyl group-containing ethylenically unsaturated monomer unit; an amine-based crosslinking agent having a melting point of at least 50° C. and no higher than 180° C.; and one or more carbon nanotubes. The crosslinked rubber is obtainable through crosslinking of the crosslinkable rubber composition. The carbon nanotubes preferably have a BET specific surface area of from 600 m2/g to 2,000 m2/g.

Abstract: A nitrile group-containing copolymer rubber which has a hydroxyl group, carboxyl group, or carbon-carbon double bond at an end carbon atom or on a carbon atom which bonds with the end carbon atom is provided. The nitrile group-containing copolymer rubber is preferably obtained by a metathesis reaction. A nitrile group-containing copolymer rubber which is excellent in cross-linkability can be provided.

Abstract: A cross-linkable rubber composition for a seal material which is used at an oilfield or gas well comprising a nitrile group-containing copolymer rubber which contains ?,?-ethylenically unsaturated nitrile monomer units 10 to 60 wt % and has an iodine value of 120 or less, an ?,?-ethylenically unsaturated carboxylic acid metal salt (B), and an organic peroxide cross-linking agent (C) is provided. According to the present invention, it is possible to provide a rubber composition which is excellent in shapeability, is high in durability against hydrogen sulfide and other corrosive gases, and is suitable for application as a seal material which is used at an oilfield or gas well.

Abstract: A cross-linked rubber is excellent in both fuel oil resistance and cold resistance. A cross-linkable rubber composition contains: a nitrile group-containing copolymer rubber [A] including less than 30 wt % ?,?-ethylenically unsaturated nitrile monomer units (a1), conjugated diene monomer units (b1), and ?,?-ethylenically unsaturated dicarboxylic acid monoester monomer units (d1), wherein at least part of the conjugated diene monomer units (b1) is hydrogenated; a nitrile group-containing copolymer rubber [B] including not less than 30 wt % ?,?-ethylenically unsaturated nitrile monomer units (a2) and conjugated diene monomer units (b2), wherein at least part of the conjugated diene monomer units (b2) may be hydrogenated; and an amine-based cross-linking agent.

Abstract: A nitrile group-containing copolymer rubber which has a hydroxyl group, carboxyl group, or carbon-carbon double bond at an end carbon atom or on a carbon atom which bonds with the end carbon atom is provided. The nitrile group-containing copolymer rubber is preferably obtained by a metathesis reaction. A nitrile group-containing copolymer rubber which is excellent in cross-linkability can be provided.

Abstract: A nitrile rubber composition which contains a carboxyl group-containing nitrile rubber (A), a liquid nitrile rubber (B), and a polyamine-based cross-linking agent (C) is provided. In the nitrile rubber composition of the present invention, preferably the carboxyl group-containing nitrile rubber (A) has an iodine value of 120 or less. Further, in the nitrile rubber composition of the present invention, preferably the carboxyl group-containing nitrile rubber (A) contains ?,?-ethylenically unsaturated nitrile monomer units 5 to 60 wt %, carboxyl group-containing monomer units 0.1 to 20 wt %, and conjugated diene monomer units 15 to 94.9 wt %.

Abstract: A cross-linkable rubber composition for a seal material which is used at an oilfield or gas well made of a nitrile group-containing copolymer rubber (A) which contains ?,?-ethylenically unsaturated nitrile monomer units 10 to 60 wt % and has an iodine value of 120 or less, an ?,?-ethylenically unsaturated carboxylic acid metal salt (B), and an organic peroxide cross-linking agent (C) is provided. Accordingly, it is possible to provide a rubber composition which is excellent in shapeability, is high in durability against hydrogen sulfide and other corrosive gases, and is suitable for application as a seal material which is used at an oilfield or gas well.

Abstract: A positive electrode for a secondary battery wherein the electrode includes a collector and a positive electrode active material layer which is stacked upon the collector, and which includes a positive electrode active material, a conductive agent, and a binder; the binder includes a first polymer and a second polymer; the first polymer is a fluorine-containing polymer; the second polymer includes a polymerized moiety having a nitrile group, a polymerized moiety having a hydrophilic group, a polymerized (meth)acrylic acid ester moiety, and a straight-chain polymerized alkylene moiety having a carbon number of at least 4; the proportion of the first polymer and the second polymer in the binder, expressed as a mass ratio, is in the range of 95:5 to 5:95.