Abstract: Provided are a rubber composition for a canvas chafer which, despite being low cost, is excellent in rim chafing resistance, resistance to rim damage, and processability (sheeting processability, rubber flow in the tire, adhesion to adjacent components) and performs well with respect to low heat build-up, and a pneumatic tire including the composition. The invention relates to a rubber composition for a canvas chafer, including: an isoprene-based rubber; a carbon black having an N2SA of 65-200 m2/g; and sulfur, wherein an amount of the isoprene-based rubber is 25-80% by mass and an amount of butadiene rubber is not more than 40% by mass, each based on 100% by mass of a rubber component of the rubber composition, and an amount of the carbon black is 40-80 parts by mass and an amount of the sulfur is 1.0-2.7 parts by mass, each per 100 parts by mass of the rubber component.

Abstract: The present invention provides a rubber composition for tires capable of improving handling stability, fuel economy, wet grip performance, elongation at break, and abrasion resistance together while maintaining the balance between them. The present invention also provides a pneumatic tire including the rubber composition. The present invention relates to a rubber composition for tires containing a diene rubber, silica having a BET specific surface area of 170 to 270 m2/g, sulfur, and a liquid resin having a softening point of ?20 to 45° C., wherein the amount of the liquid resin is 0.5 to 20 parts by mass, and the amount of the silica is 40 to 120 parts by mass, each per 100 parts by mass of the rubber component of the rubber composition.

Abstract: The present invention provides a pneumatic tire having an excellent finished bonding surface between the tread and its adjacent wing or sidewall while maintaining required performance of a tire such as abrasion resistance and resistance to degradation over time. The present invention relates to a pneumatic tire including a tread and a wing or sidewall adjacent to the tread, wherein the tread is formed from a rubber composition for a tread which has a specific net sulfur content derived from crosslinking agents; the wing or sidewall is formed from a rubber composition for a wing or sidewall which has a specific net sulfur content derived from crosslinking agents; and a specific relationship is satisfied between the net sulfur content derived from crosslinking agents in the rubber composition for a tread and the net sulfur content derived from crosslinking agents in the rubber composition for a wing or sidewall.

Abstract: The present invention provides a rubber composition that improves in terms of the fuel economy of a rubber composition containing an isoprene-based rubber and also offers favorable durability and favorable processability or adhesion to steel cords, and a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition for a bead apex, sidewall packing, base tread, or breaker cushion, including: a specific rubber component; a specific amount of a specific carbon black; a specific amount of sulfur; and a specific amount of a compound represented by formula (I) below. The present invention also relates to a rubber composition for a steel cord topping, strip adjacent to steel cords, or tie gum, including: a specific rubber component; a specific amount of a specific carbon black; a specific amount of an organic acid cobalt salt; and a specific amount of a compound represented by the formula (I).

Abstract: The present invention provides a rubber composition for a tread which improves in terms of the fuel efficiency of a rubber composition containing an isoprene-based rubber and also offers favorable abrasion resistance and elongation at break, and a pneumatic tire comprising a tread formed from the rubber composition.

Abstract: The present invention provides a rubber composition capable of improving the rubber strength and fuel economy in a balanced manner, and a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition including a rubber component, carbon black, and a compound represented by formula (I) below, wherein the amount of the carbon black is 10 to 100 parts by mass per 100 parts by mass of the rubber component: wherein R1 and R2 are the same as or different from each other, and each represent a hydrogen atom, a C1-C20 alkyl group, a C1-C20 alkenyl group, or a C1-C20 alkynyl group; Mr+ represents a metal ion; and r represents a valence of the metal ion.

Abstract: The invention provides an inner liner rubber composition that enables improvements in handling stability, fuel economy, elongation at break, sheet processability, air barrier properties, and compounding cost in a balanced manner; and a pneumatic tire including an inner liner formed from the rubber composition.

Abstract: A rubber composition for an inner-liner joint strip is capable of improving green strength and adhesion, while maintaining good durability (oxidative degradation resistance, crack growth resistance) and good air retention properties, which are exhibited by a pneumatic tire formed from the composition. The rubber composition for an inner-liner joint strip, includes: a butyl rubber; silica and/or carbon black; and an alkylphenol-sulfur chloride condensate represented by formula (1) below, wherein a butyl rubber content is 60 to 100 mass % based on 100 mass % of the rubber component of the rubber composition, a total combined amount of the silica and the carbon black is 21 to 70 parts by mass per 100 parts by mass of the rubber component, and an amount of the alkylphenol-sulfur chloride condensate is 0.1 to 5 parts by mass per 100 parts by mass of the rubber component.

Abstract: An object of the present invention is to provide a rubber composition for a tread which can improve fuel economy, grip performance (in particular, wet grip performance), abrasion resistance and handling stability in a balanced manner, and a pneumatic tire produced using the rubber composition. The present invention relates to a rubber composition for a tread, including a molten mixture of a solid resin having a softening point of not lower than 40° C. and at least one softener selected from the group consisting of oils, liquid coumarone-indene resins, and liquid indene resins, and the molten mixture having a mass ratio of the solid resin to the softener of 90/10 to 50/50.

Abstract: The invention relates to a rubber composition for a tire, containing an isoprene-based rubber and a compound represented by formula (1) below, wherein an amount of the isoprene-based rubber is at least 70% by mass; and an amount of the compound represented by formula (1) is 0.5-6 parts by mass per 100 parts by mass of the rubber component. The invention also relates to a rubber composition for a tire, containing an alkylphenol-sulfur chloride condensate and a compound represented by formula (1) below, wherein an amount of the alkylphenol-sulfur chloride condensate is 0.4-6 parts by mass, and an amount of the compound represented by formula (1) is 0.5-6 parts by mass, each per 100 parts by mass of a rubber component of the rubber composition: wherein R1 represents a C2-C16 alkyl group; and R2 represents a C3-C16 alkyl, benzothiazolyl-sulfide, or cycloalkyl group.

Abstract: The present invention provides a rubber composition for a sidewall, which improves fuel economy, handling stability, tensile strength at break, elongation at break, and processability in a balanced manner, and which can also suppress the occurrence of broken spews during demolding of a resulting tire; and a pneumatic tire formed from the rubber composition.

Abstract: There is provided a rubber composition for a bead apex which can enhance extrusion processability by optimizing a rate of vulcanization during a vulcanization process, and can improve rigidity, steering stability and a low fuel consumption property, a tire having a bead apex prepared by using the rubber composition for a bead apex and being capable of enhancing steering stability and reducing rolling resistance and a tire for a sports utility vehicle (SUV) having further enhanced durability. The rubber composition for a bead apex comprises a diene rubber, a phenol resin and/or a modified phenol resin, sulfur, hexamethylenetetramine, a vulcanization accelerator, and at least one kind of vulcanization acceleration auxiliary selected from the group consisting of a citraconimide compound, a condensate of alkyl phenol and sulfur chloride, an organic thiosulfate compound and a compound represented by the general formula: R1—S—S-A-S—S—R2.

Abstract: A rubber composition for a sidewall is disclosed, which includes a specific amount of an alkylphenol-sulfur chloride condensate indicated by the formula (B1): and a specific filler, based on a rubber component including a specific amount of a natural rubber and/or an isoprene rubber and a modified butadiene rubber. A tire having the above sidewall is also disclosed.

Abstract: A rubber composition for sidewall and a tire having sidewall using thereof as well as a rubber composition for clinch and a tire having clinch using thereof that adjust scorch time and suppress surface bloom, reduce rolling resistance, can obtain sufficient rigidity as sidewall and clinch, and can improve elongation at break and durability is disclosed. Specifically, a rubber composition for sidewall and a rubber composition for clinch including specific amount of an alkylphenol-sulfur chloride condensate indicated by the formula (B1): and specific filler, based on a rubber component including specific amount of a natural rubber and/or an isoprene rubber and a butadiene rubber and/or an epoxidized natural rubber, and a tire having sidewall using thereof and clinch using thereof is disclosed.

Abstract: The present invention provides a rubber composition that allows uniform dispersion of microfibrillated plant fibers so as to improve the required performance for a tire in a balanced manner, and a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition prepared from a masterbatch obtained by mixing rubber latex, microfibrillated plant fibers and a cationic polymer, wherein 0.01 to 5 parts by mass of the cationic polymer is added per 100 parts by mass of a rubber component of the rubber latex.

Abstract: Topping rubber composition for canvas chafer which provides good rim chafing resistance, durability, sheeting processability, and less heat build-up. Topping rubber composition contains a rubber component with: (a) BR containing 2.5-20% by mass of 1,2-syndiotactic polybutadiene crystals, (b) BR having a cis content of 90% by mass or more, and/or (c) tin-modified BR obtained by polymerization with a lithium initiator and having a tin-atom content of 50-3000 ppm, a vinyl-bond content of 5-50% by mass, and a molecular weight distribution of 2 or less. Topping rubber composition also contains carbon black having N2SA of 65-130 m2/g. Total amount of (a)-(c) is 40-90% by mass per 100% by mass of the rubber component; amount of the carbon black is 50-75 parts by mass per 100 parts by mass of the rubber component. Also, pneumatic tire made with the composition.

Abstract: It is the purpose of the present invention to improve air permeation resistance, low heat build-up property and strength at break. The present invention provides a rubber composition for an inner liner including (B) specific mica, (C) carbon black and/or silica and (D) an alkylphenol-sulfur chloride condensate indicated by the formula (D1): (Wherein R1 to R3 are an alkyl group having 5 to 12 carbons; x and y are an integer of 2 to 4; and n is an integer of 0 to 10), based on (A) specific rubber component.

Abstract: Provided are a rubber composition for treads that has both excellent abrasion resistance and good wet grip performance and also offers good fuel economy and elongation at break, and a pneumatic tire (particularly for passenger vehicles and for sport utility vehicles) formed therefrom. The rubber composition includes, based on 100% by mass of a rubber component, 40-75% by mass of BR and 25-55% by mass of SBR; and includes, per 100 parts by mass of the rubber component, 40-120 parts by mass of a silica having a nitrogen adsorption specific surface area of 160-270 m2/g, and 15-50 parts by mass of a carbon black having a nitrogen adsorption specific surface area of 100-250 m2/g, wherein a ratio of a total content of silica to a total content of SBR is 0.70-2.50, and a ratio of a total content of carbon black to a total content of BR is 0.25-0.75.

Abstract: The present invention provides a rubber composition which makes it possible to improve the handling stability, ride comfort, and elongation at break in a balanced manner and at the same time to achieve satisfactory processability and fuel economy; and also provides a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition including a masterbatch that includes: a modified natural rubber with a phosphorus content of 200 ppm or less; and microfibrillated plant fibers. The rubber composition preferably has a ratio (E*a/E*b) of a complex modulus E*a in an extrusion direction to a complex modulus E*b in a perpendicular direction to the extrusion direction, both measured at a temperature of 70° C. and a dynamic strain amplitude of 2% under an initial elongation of 10%, of 1.05 to 6.00, wherein the complex modulus E*a is 7 to 100 MPa.

Abstract: A tire having a strip layer between breaker and ply using a rubber composition for a strip layer between breaker and ply capable of improving tensile strength at break and elongation at break, capable of also lessening the lowering rate of fracture property after thermal aging, and also being excellent in separation resistance property is provided. A tire having a strip layer between breaker and ply using a rubber composition for a strip layer between breaker and ply comprising (A) 2.0 to 3.9 parts by mass of sulfur, (B) 0.5 to 4 parts by mass of a cresol resin, a modified cresol resin, resorcinol or a modified resorcinol condensate and (C) 0.3 to 3 parts by mass of a partial condensate of hexamethylolmelaminepentamethylether or a partial condensate of hexamethoxymethylolmelamine, based on 100 parts by mass of a diene rubber component, wherein the thickness of the strip layer between breaker and ply is 0.3 to 3.9 mm.