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: 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: This rubber composition comprises a rubber wet master batch which uses a rubber latex solution and a carbon black (A)-containing slurry as raw materials, rubber, and carbon black (B), wherein the amount of the carbon black (A) in the rubber wet master batch is 1 to 35 parts by weight with respect to 100 parts by weight of the rubber component in the rubber wet master batch, and the total amount of the carbon black (A) and (B) in the rubber composition is 50 parts by weight or more with respect to 100 parts by weight of the total rubber component in the rubber composition. Accordingly, the present invention can provide: a rubber composition from which vulcanized rubber having excellent low heat generating properties and wear resistance can be obtained; and a method for producing the rubber composition.

Abstract: This rubber composition comprises a rubber wet master batch which uses a rubber latex solution and a carbon black (A)-containing slurry as raw materials, rubber, and carbon black (B), wherein the amount of the carbon black (A) in the rubber wet master batch is 1 to 35 parts by weight with respect to 100 parts by weight of the rubber component in the rubber wet master batch, and the total amount of the carbon black (A) and (B) in the rubber composition is 50 parts by weight or more with respect to 100 parts by weight of the total rubber component in the rubber composition. Accordingly, the present invention can provide: a rubber composition from which vulcanized rubber having excellent low heat generating properties and wear resistance can be obtained; and a method for producing the rubber composition.

Abstract: A rubber composition for tires is disclosed, which is capable of improving fuel efficiency, wet grip performance, and low-temperature characteristics, and also a pneumatic tire using the same. A rubber composition for tires, including al rubber component, an inorganic filler, a thermoplastic elastomer containing a functional group that reacts or interacts with a surface functional group of the inorganic filler and having a specific gravity of 1.00 or less, and a phosphate having a coagulation point of ?55° C.

Abstract: A rubber composition for tires is disclosed, which is capable of improving fuel efficiency, wet grip performance, and low-temperature characteristics, and also a pneumatic tire using the same. A rubber composition for tires, including, per 100 parts by mass of a rubber component, 1 to 30 parts by mass of a phosphate having a coagulation point of ?50° C. or less and 1 to 20 parts by mass of a thermoplastic elastomer having a tan ? peak value of 1.5 to 2.0 and a peak-value onset temperature within a range of ?20° C. to 20° C. as measured by the dynamic viscoelasticity test specified in JIS K6394 under conditions of 10 Hz frequency, 10% static strain, and 0.15% dynamic strain.

Abstract: A rubber composition for a tire that can reduce rolling resistance is provided. The rubber composition for a tire contains a diene rubber, at least one reinforcing filler selected from the group consisting of silica and carbon black, and at least one sucrose derivative selected from the group consisting of sucrose benzoate and sucrose acetate, wherein the amount of the sucrose derivative is from 1 to 25 parts by mass per 100 parts by mass of the diene rubber. A pneumatic tire having a rubber part comprising the rubber composition is provided.

Abstract: There is provided a method for producing a rubber composition from which a vulcanized rubber having excellent wet gripping performance, rubber hardness and abrasion resistance is yielded. This method is a method for producing a rubber composition including a diene rubber, one or more resins, and a styrene based thermoplastic elastomer. The resin(s) is/are one or more out of nonaromatic terpene resins and aliphatic petroleum resins. The method includes the step of mixing the resin(s) with the styrene based thermoplastic elastomer to produce a kneaded product, and the step of mixing the resultant kneaded product with the diene rubber.

Abstract: A tire member, comprising a diene based rubber, a filler, a rubber powder, and a compound represented by the following formula (I): wherein R1 and R2 each represent a hydrogen atom, or an alkyl group, alkenyl group or alkynyl group which has 1 to 20 carbon atoms, and may be the same as or different from each other; and M+ represents a sodium ion, a potassium ion, or a lithium ion.

Abstract: A rubber composition for a tire that can reduce rolling resistance is provided. The rubber composition for a tire contains a diene rubber, at least one reinforcing filler selected from the group consisting of silica and carbon black, and at least one sucrose derivative selected from the group consisting of sucrose benzoate and sucrose acetate, wherein the amount of the sucrose derivative is from 1 to 25 parts by mass per 100 parts by mass of the diene rubber. A pneumatic tire having a rubber part comprising the rubber composition is provided.