The present invention is to provide a rubber composition for a hose and the like, the rubber composition having excellent oil resistance and low-temperature performance. A rubber composition for a hose, the rubber composition comprising: a hydrogenated acrylonitrile butadiene rubber having an acrylonitrile amount of 24 mass % or less, a carbon black, a peroxide, and a triallyl isocyanurate; a content of the peroxide being 2.4 parts by mass or more per 100 parts by mass of the hydrogenated acrylonitrile butadiene rubber; and a content of the triallyl isocyanurate being 1.9 parts by mass or more per 100 parts by mass of the hydrogenated acrylonitrile butadiene rubber, and a hose formed by using the rubber composition for a hose.

The present invention relates to nitrile-diene-carboxylic ester copolymers, to the preparation thereof, to vulcanizable compositions containing nitrile-diene-carboxylic ester copolymers and the production thereof, and to vulcanizates based on nitrile-diene-carboxylic ester copolymers and to the use thereof in elastomeric components.

A method of recovering nitrile rubber from water-containing crumbs includes crumb-like nitrile rubber using an extruder in which a screw is disposed inside a barrel so as to be capable of being rotationally driven. The barrel is formed with at least a washing zone. The method includes supplying washing water to the washing zone at a water pressure of 0.2 MPa or higher while mixing the crumb-like nitrile rubber and the supplied washing water in the washing zone, thereby washing the crumb-like nitrile rubber.

A rubber composition is disclosed. The composition comprises a blend based on 100 parts by weight (phr) of diene elastomers: 5 to 95 phr of a first diene elastomer, 5 to 50 phr of a hydrogenated styrenic block copolymer (HSBC), 50 to 200 phr of a filler, up to 25 phr of a plasticizer. The HSBC has a melt flow ratio of 1.0 to 50.0 measured according to ASTM D-1238 at 230° C. and 2.16 kg load, a Shore A hardness of 40 to 80 measured according to ASTM D-2240, a DMA peak tan delta temperature of 0° C. to 40° C. at 1 Hz measured according to ASTM D-4065, and an order-disorder transition temperature of 200° C. to 300° C. The composition does not comprise a resin, a plasticizer, or comprises a resin or a plasticizer in an amount of less than 20 phr.

A sealing member for mechanical seals, which is a peroxide vulcanized molded article of a hydrogenated nitrile rubber having a bound acrylonitrile content of less than 20% and an iodine number of 20 mg/100 g or less. The sealing member for mechanical seals is obtained as a peroxide vulcanized molded article of a hydrogenated nitrile rubber composition comprising 0 to 5 parts by weight of carbon black, 20 to 100 parts by weight of silica, and 0.5 to 3 parts by weight of silane coupling agent, based on 100 parts by weight of hydrogenated nitrile rubber, and preferably further compounding 50 parts by weight or less of titanium oxide non-reinforcing filler. The obtained vulcanized molded article is to provide a sealing member for mechanical seals that can achieve desired LLC resistance, and that has excellent compression set characteristics, cold resistance, processability, hardness, etc.

Disclosed are a water-expandable rubber composition and a water-expandable rubber pad including the same. The water-expandable rubber pad manufactured using the water-expandable rubber composition is rigid enough to be directly inserted into a cylinder jacket even without a metal plate, etc. Moreover, the water-expandable rubber pad may increase in volume upon contact with engine coolant, thereby being optimized for an assembly process and facilitating design. Thus, since no separate assembly parts are used compared to conventional cases, the number of parts can be reduced, and costs can be reduced, and adhesiveness of the rubber pad is superior to that of conventional foam rubber and thus heat retention performance is excellent, resulting in improved engine fuel efficiency.

Disclosed are a water-expandable rubber composition and a water-expandable rubber pad including the same. The water-expandable rubber pad manufactured using the water-expandable rubber composition is rigid enough to be directly inserted into a cylinder jacket even without a metal plate, etc. Moreover, the water-expandable rubber pad may increase in volume upon contact with engine coolant, thereby being optimized for an assembly process and facilitating design. Thus, since no separate assembly parts are used compared to conventional cases, the number of parts can be reduced, and costs can be reduced, and adhesiveness of the rubber pad is superior to that of conventional foam rubber and thus heat retention performance is excellent, resulting in improved engine fuel efficiency.

A method produces a hydrogenated nitrile rubber having an iodine value of 120 or less, the method having a first coagulation step of adding a halogen atom-free metal salt as a coagulant to a nitrile rubber latex to form a nitrile rubber coagulum; a solution preparation step of dissolving the nitrile rubber coagulum in an organic solvent to prepare a nitrile rubber solution; a hydrogenation step of subjecting the nitrile rubber solution to a hydrogenation reaction to afford a hydrogenated nitrile rubber solution; and a second coagulation step of adding a divalent metal salt as a coagulant to the hydrogenated nitrile rubber solution to form a hydrogenated nitrile rubber coagulum.

A method produces a hydrogenated nitrile rubber having an iodine value of 120 or less, the method having a first coagulation step of adding a halogen atom-free metal salt as a coagulant to a nitrile rubber latex to form a nitrile rubber coagulum; a solution preparation step of dissolving the nitrile rubber coagulum in an organic solvent to prepare a nitrile rubber solution; a hydrogenation step of subjecting the nitrile rubber solution to a hydrogenation reaction to afford a hydrogenated nitrile rubber solution; and a second coagulation step of adding a divalent metal salt as a coagulant to the hydrogenated nitrile rubber solution to form a hydrogenated nitrile rubber coagulum.

A subsea electrical connector or electrical cable having a conductor, an insulator coaxial with the conductor; and at least one of a volumetric compensating diaphragm located radially outwardly of the insulator, or a termination boot. The diaphragm or termination boot has a compound layer, the compound layer includes a graphene nano-platelet additive incorporated into a cross-linked polymer matrix to produce a polymer composite.