Abstract: The present invention is a method for producing a vulcanized rubber composition that contains a rubber component containing a polyisoprene rubber, and a syndiotactic 1,2-polybutadiene, wherein the syndiotactic 1,2-polybutadiene and the polyisoprene rubber are kneaded at a temperature higher by 10 to 100° C. than the melting point of the syndiotactic 1,2-polybutadiene, and the resultant unvulcanized rubber composition is vulcanized at a temperature falling within a range of the melting point of the syndiotactic 1,2-polybutadiene ±15° C. The method improves the crack growth resistance of the vulcanized rubber composition.

Abstract: Disclosed is a rubber composition which comprises: a rubber component containing 30% by mass or more of a natural rubber and/or a synthetic polyisoprene; and a total of less than 10 parts by mass of a linear polyol and a cyclic polyol per 100 parts by mass of the rubber component.

Abstract: An object of the present invention is to provide a rubber composition from which a crosslinked rubber composition having excellent crack resistance and high breaking elongation and breaking stress can be obtained. Further, another object thereof is to provide a rubber product and a tire using the rubber composition. A rubber composition of the present invention comprises a rubber component (A) comprising 30% by mass or more of a natural rubber and a synthetic isoprene rubber in total, at least one (B) selected from the group consisting of a reclaimed rubber and a powdered rubber, and a polyhydric alcohol (C) having 3 or more hydroxyl groups per molecule.

Abstract: A tire containing at least a circular tire frame body that is formed from a resin material and has a layered structure, wherein the tire frame body includes at least one gas retaining layer.

Abstract: A tire containing at least a circular tire frame body that is formed from a resin material and has a layered structure, wherein the tire frame body includes at least one gas retaining layer.

Abstract: A tire containing at least a circular tire frame body that is formed from a resin material and has a layered structure, wherein the tire frame body includes at least one gas retaining layer.

Abstract: A durable refrigerant transporting hose is provided which includes a gas barrier layer made of a polyamide resin composition, and prevented from being degraded by the refrigerant or compressor oil. A refrigerant transporting hose 1 including a gas barrier layer 2 made of a polyamide resin composition. The polyamide resin composition contains at least one metal compound selected from the group consisting of hydroxides, oxides and carbonates of divalent and trivalent metals in an amount of 1% to 15% by weight relative to the total amount of the metal compound and the polymer component. An olefin elastomer may be added to the polyamide resin composition to enhance the flexibility and durability.

Abstract: A durable refrigerant transporting hose is provided which includes a gas barrier layer made of a polyamide resin composition, and prevented from being degraded by the refrigerant or compressor oil. A refrigerant transporting hose 1 including a gas barrier layer 2 made of a polyamide resin composition. The polyamide resin composition contains at least one metal compound selected from the group consisting of hydroxides, oxides and carbonates of divalent and trivalent metals in an amount of 1% to 15% by weight relative to the total amount of the metal compound and the polymer component. An olefin elastomer may be added to the polyamide resin composition to enhance the flexibility and durability.

Abstract: The rubber composition and the material suitable for preparing the rubber composition show high gas-barrier properties and being free from inhibition of vulcanization. The rubber composition is essentially composed of a rubber and a layered mineral filler treated with short chain alkyl ammonium salt.

Abstract: The rubber composition and the material suitable for preparing the rubber composition show high gas-barrier properties and being free from inhibition of vulcanization. The rubber composition is essentially composed of a rubber and a layered mineral filler treated with short chain alkyl ammonium salt.

Abstract: Disclosed is a guide lug composition for a rubber track comprising 5 to 40 parts by weight of a fatty acid amide based on 100 parts by weight of a raw rubber material; or comprising 5 to 40 parts by weight of a Ultra High Molecular Weight Polyethylene (UHMW-PE) powder based on 100 parts by weight of a raw rubber material; or comprising 5 to 40 parts by weight of a fatty acid amide and 5 to 40 parts by weight of a UHMW-PE power based on 100 parts by weight of a raw rubber material. The guide lug composition serves to reduce abrasion of or damages to a guide lug, to improve the characteristics in preventing the rubber track from slipping off a wheel, which is called “detracking”, to reduce friction loss when the guide lug contacts and collides with the wheel thereby reducing energy losses.

Abstract: There is provided a rubber track used for an undercarriage of a vehicle, and particularly an improvement in a guide lug which protrudes from an inner peripheral surface of the rubber track. In the rubber track in which a plurality of rubber lugs are formed on an outer peripheral surface of an endless rubber elastic body and a plurality of guide lugs are formed on an inner peripheral surface of the elastic body, the guide lugs being used for transmission of driving force or prevention of detracking between the guide lugs, and track rollers, idlers or sprockets, a heat-resisting thermoplastic resin member having low friction properties, a heat-resisting thermosetting resin member having low friction properties, or a resin member having a Barcol hardness (A type) of 40 degrees or less is exposed at one or more surfaces of each of the guide lugs, the surface or surfaces contacting other member.