Abstract: A rubber composition for tires, comprising a rubber component and a vegetable oil wherein the vegetable oil contains palmitic acid and oleic acid in a mass ratio ((palmitic acid)/(oleic acid)) of 0.65 or more and 1.2 or less. It is preferred that the vegetable oil is palm oil. It is more preferred that the vegetable oil has an iodine value of 50 or more and 75 or less. It is more preferred that the vegetable oil has an oleic acid content of 40% by mass or more and 53% by mass or less.

Abstract: Provided are a rubber composition, which is capable of providing excellent ozone resistance while suppressing discoloration, and a pneumatic tire using the same. The rubber composition includes a diene-based rubber, a filler, a phenylenediamine represented by the following formula (1) (wherein R1 and R2 are each an alkyl group or aryl group with 7 or more carbon atoms, provided that at least one of R1 and R2 is an alkyl group with 7 or more carbon atoms), and a quinoline-based antioxidant, and is free of N-phenyl-N?-isopropyl-p-phenylenediamine (IPPD) and N-phenyl-N?-(1,3-dimethylbutyl)-p-phenylenediamine (6PPD).

Abstract: A rubber composition comprising a zinc oxide which comprises aluminum and iron. The zinc oxide's content of the iron is preferably 15 ppm or more and 100 ppm or less and the zinc oxide's content of the aluminum is 40 ppm or more and 100 ppm or less. The zinc oxide's ratio of a content of the iron to a content of the aluminum is preferably 0.2 to 2.3. The zinc oxide's content of the iron is preferably 15 ppm or more and 80 ppm or less. The rubber composition is used for rubber-steel cord composites.

Abstract: A rubber composition for tire treads comprising zinc oxide wherein the zinc oxide contains aluminum and iron. It is preferred that the zinc oxide has a content of the iron of 15 ppm or more and 100 ppm or less and a content of the aluminum of 40 ppm or more and 100 ppm or less. It is more preferred that the zinc oxide has a ratio of a content of the iron to a content of the aluminum of 0.2 to 2.3. It is more preferred that the zinc oxide has a content of the iron of 15 ppm or more and 80 ppm or less.

Abstract: Provided are a rubber composition, which is capable of providing excellent low heat generation properties, aging resistance, and ozone resistance, and a pneumatic tire using the same. The rubber composition includes a diene-based rubber, a filler, a phenylenediamine represented by the following formula (1) (wherein R1 and R2 are each an alkyl group or aryl group with 7 or more carbon atoms, provided that at least one of R1 and R2 is an alkyl group with 7 or more carbon atoms), a quinoline-based antioxidant, and N-cyclohexyl-2-benzothiazolylsulfenamide, in which silica is present in a proportion of 70 mass % or less based on the total filler amount, and the rubber composition is free of N-phenyl-N?-isopropyl-p-phenylenediamine (IPPD) and N-phenyl-N?-(1,3-dimethylbutyl)-p-phenylenediamine (6PPD).

Abstract: Provided are a rubber composition for a tire tread, which is capable of improving rolling resistance and abrasion resistance, and a tire using the same. The rubber composition for a tread includes: 100 parts by mass of a rubber component containing 30 parts by mass or more of a solution-polymerized styrene butadiene rubber and less than 50 parts by mass of a diene-based rubber other than styrene butadiene rubbers; 60 parts by mass or more of silica; and a trialkyl phosphate in an amount of 1.5 to 20 mass % of the silica content.

Abstract: A rubber composition for tires according to an embodiment is produced by kneading a diene rubber, silica, and a granular carbon nanotube prepared as a binder-coated, granulated carbon nanotube. A tire according to an embodiment comprises the rubber composition.

Abstract: A rubber composition for a tire tread according to an embodiment includes, per 100 parts by mass of a rubber component including 40 parts by mass or more of at least one selected from the group consisting of a natural rubber and a synthetic isoprene rubber: 5 to 50 parts by mass of a polyterpene resin having a softening point of 110° C. or more and a glass transition point of 55° C. or more and containing a ?-pinene unit; and 50 to 150 parts by mass of silica.

Abstract: A rubber-steel cord composite according to an embodiment is formed by vulcanizing and bonding a rubber composition containing 1 to 10 parts by mass of sulfur, 0.1 to 5 parts by mass of N,N-dibenzylbenzothiazole-2-sulfenamide, and 0.1 to 5 parts by mass of either one or both of hexamethylene bis-thiosulfate disodium salt dihydrate and 1,6-bis(N,N-dibenzylthiocarbamoyldithio)hexane, with respect to 100 parts by mass of diene rubber containing natural rubber, and a steel cord. A pneumatic tire according to an embodiment includes the rubber-steel cord composite.

Abstract: A rubber-steel cord composite in which a rubber composition and a steel cord are vulcanized and adhere to each other, wherein the rubber composition contains 1 to 10 parts by mass of a vulcanizing agent, 0.1 to 5 parts by mass of N,N-dibenzylbenzothiazole-2-sulfenamide, and 0.1 to 5 parts by mass of a bismaleimide compound, with respect to 100 parts by mass of diene rubber containing natural rubber.

Abstract: A rubber composition according to an embodiment contains a rubber component and silica. In the rubber component, an amount of a vinyl bond unit derived from butadiene in a total amount of the rubber component is 10 mass % or more, and a content of a solution polymerized styrene-butadiene rubber is less than 50 mass %. A content of the silica is 90 parts by mass to 200 parts by mass, and a content of a metal oxide is less than 0.5 parts by mass, with respect to 100 parts by mass of the rubber component.

Abstract: A tire masterbatch comprises natural rubber and cellulose nanofiber, wherein at least a portion of the cellulose nanofiber is such that length is 10 ?m to 20 ?m, and a ratio (i.e., L/D) of the length to a diameter is 1000 to 2000. A tire masterbatch manufacturing method comprises an operation in which at least a cellulose nanofiber slurry and a natural rubber latex are mixed to prepare a liquid mixture, and an operation in which the liquid mixture is coagulated, wherein at least a portion of cellulose nanofiber within the cellulose nanofiber slurry is such that length is 10 ?m to 20 ?m, and a ratio (i.e., L/D) of the length to a diameter is 1000 to 2000.

Abstract: A rubber composition for tires according to an embodiment is produced by kneading a diene rubber, silica, and a granular carbon nanotube prepared as a binder-coated, granulated carbon nanotube. A tire according to an embodiment comprises the rubber composition.

Abstract: A rubber composition has a rubber component, sulfur, a bismaleimide compound, and a compound represented by Formula (I) below: wherein R1 is an alkylene group having 1 to 3 carbon atoms, and R2 and R3 are each independently an aromatic hydrocarbon or an alkyl group having 4 or more carbon atoms. The rubber composition has a content of the sulfur of 0.3 parts by mass or less based on 100 parts by mass of a total amount of the rubber component. The rubber composition preferably further has a compound represented by Formula (2) below: [Formula 2] R4—S—(CH2)x—S—R4 ??(2) wherein x is an integer of 2 to 12, and R4 is a thiocarbamoyl group having an aromatic hydrocarbon or a fatty acid hydrocarbon in a molecular structure, a benzothiazole group having an aromatic hydrocarbon or a fatty acid hydrocarbon, or an —SO3?Na group.

Abstract: A rubber composition has a rubber component and recycled carbon black. The recycled carbon black has an ash content of 13% by mass or more. The rubber composition preferably further has a silane coupling agent. The rubber composition preferably has a content of the recycled carbon black of 5 to 60 parts by mass based on 100 parts by mass of a total amount of the rubber component.

Abstract: A pneumatic tire according to an embodiment is a pneumatic tire including a belt pad disposed between a belt end and a carcass ply. The belt pad is formed by a rubber composition containing 1 to 10 parts by mass of sulfur, 0.1 to 5 parts by mass of N,N-dibenzylbenzothiazole-2-sulfenamide, and 0.1 to 5 parts by mass of either one or both of 1,6-bis(N,N-dibenzylthiocarbamoyldithio)hexane and hexamethylene bis-thiosulfate disodium salt dihydrate, with respect to 100 parts by mass of diene rubber.

Abstract: A rubber-steel cord composite in which a rubber composition and a steel cord are vulcanized and adhere to each other, wherein the rubber composition contains 1 to 10 parts by mass of a vulcanizing agent, 0.1 to 5 parts by mass of N,N-dibenzylbenzothiazole-2-sulfenamide, a melamine derivative, and a resorcinol compound, with respect to 100 parts by mass of diene rubber containing natural rubber.

Abstract: A rubber-steel cord composite in which a rubber composition and a steel cord are vulcanized and adhere to each other, wherein the rubber composition contains 1 to 10 parts by mass of a vulcanizing agent, 0.1 to 5 parts by mass of N,N-dibenzylbenzothiazole-2-sulfenamide, and 0.1 to 5 parts by mass of a bismaleimide compound, with respect to 100 parts by mass of diene rubber containing natural rubber.

Abstract: A rubber-steel cord composite according to an embodiment is formed by vulcanizing and bonding a rubber composition containing 1 to 10 parts by mass of sulfur, 0.1 to 5 parts by mass of N,N-dibenzylbenzothiazole-2-sulfenamide, and 0.1 to 5 parts by mass of either one or both of hexamethylene bis-thiosulfate disodium salt dihydrate and 1,6-bis(N,N-dibenzylthiocarbamoyldithio)hexane, with respect to 100 parts by mass of diene rubber containing natural rubber, and a steel cord. A pneumatic tire according to an embodiment includes the rubber-steel cord composite.

Abstract: A rubber composition which contains carbon black, wherein the carbon black satisfies the following requirements: the 90-vol % particle diameter (D90) is 35 ?m or smaller; and the degree of particle surface ruggedness expressed by the ratio of the area (?m2) (A) of a projected image of a carbon black particle to the area (?m2) (B) of a contour formed by surrounding the projected image of the carbon black particle by one line having a minimum length, (A)/(B), is 0.9 or less. The rubber composition of the present invention gives a vulcanized rubber having low heat build-up properties.