Abstract: A fluororubber composition that is a kneaded mixture of a carbon nanotube masterbatch comprising 4 to 20 parts by weight of multilayer carbon nanotubes, which are fibrous carbon nanostructures that do not contain monolayer carbon nanotubes, based on 100 parts by weight of a fluororubber polymer, and a fluororubber raw material comprising at least a fluororubber polymer and a reinforcing filler, in which the multilayer carbon nanotubes are compounded in an amount of 0.5 to 6 wt. % in the kneaded mixture. The kneading is performed using a roll or a kneader when the fluororubber composition is produced. The fluororubber composition can provide a fluororubber crosslinked molded article that exhibits abrasion resistance and blister resistance.

Abstract: A sealing device acts to seal a gap between a housing of a gear reducer and a rotational shaft that bi-directionally rotates, and separates an internal space of the housing in which a grease is stored from an atmosphere side. The sealing device includes a main seal lip protruding radially inward from an inner peripheral surface of an inner cylindrical portion. The main seal lip has an internal-side inclined surface disposed on a side of the internal space and an atmosphere-side inclined surface disposed on the atmosphere side. An auxiliary seal lip protrudes radially inward and toward the internal space from the internal-side inclined surface of the main seal lip. Multiple first spiral structures and multiple second spiral structures are formed on at least one of the atmosphere-side inclined surface of the main seal lip and an inner peripheral surface of the auxiliary seal lip.

Abstract: A chloroprene rubber composition comprising 0.8 to 4 parts by weight of 2,4,6-trimercapto-s-triazine and 0.5 to 4.5 parts by weight of tetrabenzylthiuram disulfide based on 100 parts by weight of chloroprene rubber. The chloroprene rubber composition maintains processability (scorch time) and productivity (crosslinking rate) equivalent to those of conventionally used crosslinking systems, without using substances subject to environmental regulations in crosslinking systems, and at the same time, improves physical properties, such as strength, elongation, and compression set characteristics.

Abstract: Provided is an olefin-based rubber composition having low hardness, good thermal conductivity, and good electrical insulation, and applying little load on a manufacturing facility. The olefin-based rubber composition of the present disclosure contains an ethylene-?-olefin-nonconjugated polyene copolymer, at least two types of magnesium carbonate which are small-particle size magnesium carbonate with 0.3 to 5 ?m of an average particle size and large-particle size magnesium carbonate with 7-60 ?m of an average particle size, and a cross-linking agent, wherein the composition contains 400 to 1200 parts by mass of a total content of the two types of magnesium carbonate per 100 parts by mass of the ethylene-?-olefin-nonconjugated polyene copolymer, Shore A hardness conforming to JIS K 6253-3 : 2012 of the olefin-based rubber composition after cross-linking is 80, and thermal conductivity conforming to ASTM D7984 of the olefin-based rubber composition after cross-linking is 2.0 W/m·K or more.

Abstract: A gasket includes an elastic part containing a rubber having a dynamic-to-static ratio, Kd/Kst, of 2.5 or lower, wherein the dynamic-to-static ratio, Kd/Kst, is a ratio between a dynamic spring constant, Kd, and a static spring constant, Kst. The dynamic spring constant, Kd, represents a constant as measured under conditions of 23±2° C., 100 Hz, and a strain amplitude of 0.1% according to JIS K6394:2007, and the static spring constant, Kst, represents a constant as measured under conditions of 23±2° C. and a strain amplitude of 0.1% according to JIS K6394:2007.

Abstract: A gasket includes an elastic part containing a rubber having a dynamic spring constant of 1.5 g/?m or lower as measured under conditions of 23±2° C., 100 Hz, and a strain amplitude of 0.1% according to JIS K6394:2007.

Abstract: A dust cover and a sealing structure for improving sealing performance by stabilizing a posture of a seal section. A seal section 130 includes: an inner peripheral seal part 131 which is slidable with respect to an outer peripheral surface of a shaft part 310; a dust lip part 132 which is slidable with respect to an end surface of a first flange part 340; and an auxiliary dust lip part 133 provided on an radially inner side of the dust lip part 132, and the auxiliary dust lip part 133 is configured to be slidable with respect to a curved surface 310a which connects the shaft part 310 and the first flange part 340 to each other.

Abstract: An acrylic rubber composition comprising 0.05 to 3.0 parts by weight of a fluorine-containing compound having a melting point of 30 to 100° C., based on 100 parts by weight of acrylic rubber. The acrylic rubber composition that can improve the dispersibility of a processing aid in the compound and the rubber compound handling properties during open roll operation without using a silicone-based processing aid, which causes bleeding of vulcanizates, and that satisfies the various characteristics, such as dimensional stability and heat resistance, of vulcanizates.

Abstract: A biological electrode that includes an electrode member made of a conductive rubber having a plurality of electrode portions in contact with a body of a subject. The plurality of electrode portions are protrusively formed on an electrode portion forming surface of the electrode member and arranged circularly or concentrically on the electrode portion forming surface. Further, each of the plurality of electrode portions is formed so that a cross-sectional area thereof gradually decreases from a proximal end portion thereof toward a distal end portion thereof and a center of a cross section of the distal end portion is positioned radially outward of a center of a cross section of the proximal end portion as viewed from an arrangement center of the plurality of electrode portions.

Abstract: Thermally conductive electrically insulating compositions and structures and devices comprising such materials. In various embodiments, such materials comprise liquid crystal polymer and fillers, wherein the fillers comprise boron nitride and glass fiber. In various embodiments, the liquid crystal polymer is selected from the group consisting of semi-aromatic copolyesters, copolyamides, polyester-co-amides, and mixtures thereof.

Abstract: A vibration-proof bush capable of suppressing incomplete fitting of an upper bush and a lower bush. The vibration-proof bush includes an upper bush configured to be mounted on a vehicle body side and a lower bush configured to be fitted to the upper bush are provided, wherein the vibration-proof bush includes interference portions configured to interfere with each other in a process of fitting the lower bush to the upper bush, and the interference portions form a fitting-sound generation structure in which a sound is generated, when the lower bush is fitted to the upper bush during temporary assembling.

Abstract: Provided are a fluororubber composition maintaining rubber properties and excellent in flowability and mold releasability as well as capable of reducing a cross-linking time when molded, and a fluororubber sealing material formed of the fluororubber composition. The fluororubber composition contains a polyol cross-linkable based fluororubber; an aliphatic acid amide based compound; at least one member selected from a phosphoric acid ester based compound, an aliphatic acid ester based compound and a fluorine-containing based compound; and a polyol based cross-linking agent. The fluororubber sealing material is formed of the fluororubber composition.

Abstract: A gasket manufacturing method, which enables an improvement in sealing performance by making the thickness of a gasket formed on a bead on a base member more uniform. The manufacturing method of a separator-integrated gasket includes dispensing a gasket material, and curing the gasket material dispensed on the bead. The bead includes portions having different widths in a short direction thereof. Compared to a moving speed of a dispensing apparatus relative to the separator body in a narrow portion where the width is small, the moving speed is slower in a wide portion having a larger width than the narrow portion.

Abstract: Provided are a ball joint and a dust cover that make it possible to suppress contact of a body portion of the dust cover with the vicinity of a flange portion of a ball stud. A dust cover integrally includes: a deformable bellows-shaped body portion made of an elastic body; a fixed portion made of an elastic body and provided on one end side of the body portion; and a sealing portion made of an elastic body and provided on the other end side of the body portion. The sealing portion includes: an inner peripheral sealing portion configured to be slidable on a part of a shank portion on the opposite side of the shank portion from a spherical portion with respect to a flange portion; and a cover portion that continuously covers, in an outer wall surface of the flange portion, a radially outward tip end portion and a part of a portion that decreases in diameter from the tip end portion toward the spherical portion side.

Abstract: A fluororubber composition comprising 3 to 20 parts by weight of carbon fibers and 1 to 8 parts by weight of carbon nanotubes based on 100 parts by weight of fluororubber. The crosslinked molded article obtained from the fluororubber composition has excellent effects of not only imparting oil film retention, but also improving the material strength of fluororubber due to the combined use of carbon nanotubes, which have high reinforcing properties. Further, the fluororubber composition can give a fluororubber crosslinked product excellent in abrasion resistance and pressure resistance.

Abstract: A coating solution comprising an organic solvent solution containing polyol-crosslinkable fluororubber, a polyol vulcanizing agent, and N-phenyl-3-aminopropyltrialkoxysilane, preferably a coating solution further containing an epoxy resin in addition thereto, and a fluororubber metal laminated sheet formed by applying the above coating solution to a metal sheet, followed by vulcanization. The coating solution can not only impart stability over time to the fluororubber paste, but also improve the interlayer adhesion and abrasion resistance of the fluororubber metal laminated sheet. Therefore, when it is used as a cylinder head gasket, it is possible to cope with the reduction in rigidity due to the increase in combustion pressure of the engine, and with weight saving. As a result, it will greatly contribute to the improvement of fuel efficiency of automobiles.

Abstract: Provided is a method for manufacturing a biological electrode capable of simply manufacturing a biological electrode in which an increase in resistance value over time due to strain is suppressed. The method for manufacturing a biological electrode includes a step of adding fumed silica to an aggregated silver powder to obtain a mixed silver powder and a step of forming a conductive rubber body containing a silicone rubber and the mixed silver powder.

Abstract: A sealing device includes: a housing; a seal ring configured to be axially displaceably inserted along an inner circumference of the housing, the seal ring including a front-end surface and a rear-end surface which defines packing mounting space; a packing configured to establish sealing between the housing and the seal ring, the packing being disposed in the packing mounting space; and spring means disposed on the rear-end surface side of the seal ring to elastically bias the seal ring toward the front-end surface side.

Abstract: An aqueous surface-treating agent comprising (A) an aqueous emulsion of silicone oil, (B) a silanol-modified polyurethane resin, (C) a silane compound and/or a partial hydrolysate thereof, (D) an aqueous emulsion of a hydrazide and a carbonyl group-containing polyurethane resin, and (E) an aqueous emulsion of a polyurethane resin having a glass transition temperature of ?30° C. or lower, and a thermal softening temperature of 70° C. or lower measured by using a flow tester when heated from 40° C. to 150° C. at a heating rate of 5° C./min. The aqueous surface-treating agent contains silicone oil for preventing sticking between products and a silanol-modified polyurethane resin binder having a low hardness and excellent adhesiveness to seal members, and improves the corrosion resistance of an aqueous surface-treating agent for aluminum substrates etc.

Abstract: An upper gasket member includes an upper base portion of an annular flat plate, an upper outer periphery portion diagonally extending to an upper side from an outer periphery edge portion of the upper base portion, and an upper outer periphery side annular portion of an annular flat plate extending in an extension direction of the upper base portion from an outer periphery edge portion of the upper outer periphery portion. Further, a lower gasket member includes a lower base portion of an annular flat plate, a lower outer periphery portion diagonally extending to a lower side from an outer periphery edge portion of the lower base portion, and a lower outer periphery side annular portion of an annular flat plate extending in an extension direction of the lower base portion from an outer periphery edge portion of the lower outer periphery portion.