Patent application number | Description | Published |
20110160337 | RUBBER COMPOSITION FOR TREAD AND PNEUMATIC TIRE - It is an object of the present invention to provide: a rubber composition for a tread, which improves processability, rolling resistance, wet skid performance, abrasion resistance, and handling stability in good balance; and a pneumatic tire having a tread produced from the rubber composition. The present invention relates to a rubber composition for a tread, including: a rubber component; an aromatic vinyl polymer; silica; and a mercapto group-containing silane coupling agent, wherein the aromatic vinyl polymer is a resin obtained by polymerization of α-methylstyrene and/or styrene, and the amount of the aromatic vinyl polymer is 3 to 25 parts by mass, and the amount of the silica is 15 to 150 parts by mass, based on 100 parts by mass of the rubber component. | 06-30-2011 |
20140100317 | RUBBER COMPOSITION FOR TREAD, AND PNEUMATIC TIRE - The present invention provides a rubber composition for a tread, having improved abrasion resistance, heat aging resistance, processability, and fuel economy in a balanced manner, and a pneumatic tire formed therefrom. The present invention relates to a rubber composition for a tread, comprising a rubber component, silica, a silane coupling agent, a sulfur vulcanizing agent, a sulfenamide or thiazole vulcanization accelerator 1, and a thiuram vulcanization accelerator 2. | 04-10-2014 |
20140155539 | RUBBER COMPOSITION FOR TIRES, AND PNEUMATIC TIRE - The invention provides a rubber composition for tires, enabling a balanced improvement of processability, rubber strength, fuel economy, and crack growth resistance; and a pneumatic tire formed from the rubber composition. The invention relates to a rubber composition for tires, including: a butadiene rubber (a) having a cis content of 96% by mass or more, a Mooney viscosity of 35 to 75, and a ratio of (Weight average molecular weight (Mw))/(Number average molecular weight (Mn)) of 2.7 or less; and a butadiene rubber (b) containing 1,2-syndiotactic polybutadiene crystals with a melting point of 90 to 140° C., and having a weight average molecular weight of 50,000 to 500,000. | 06-05-2014 |
20140194552 | RUBBER COMPOSITION FOR TIRES, AND PNEUMATIC TIRE - Provided are: a rubber composition for tires capable of improving fuel economy, wet grip performance, and abrasion resistance; and a pneumatic tire including the same. Included is a rubber composition for tires including: a diene polymer; silica; and a liquid resin having a softening point of −20 to 20° C., the diene polymer being a modified diene polymer obtained by reacting components (A) and (B), the liquid resin being present in an amount of 3-40 parts by mass per 100 parts by mass of the rubber component, the component (A) being an active alkali metal-terminated conjugated diene polymer obtained by polymerizing a conjugated diene monomer alone or with an aromatic vinyl monomer, in the presence of a component (C) the component (B) being a modifier containing a functional group, the component (C) being a chemical species obtained by reacting an organic alkali metal compound and a compound of Formula (1) below. | 07-10-2014 |
20140213707 | RUBBER COMPOSITION FOR TIRE, AND PNEUMATIC TIRE - The present invention provides a rubber composition for a tire having improved abrasion resistance, fuel economy and processability in a balanced manner. The present invention also provides a method for producing the rubber composition, and a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition for a tire obtained by mixing a kneaded mixture containing butadiene rubber | 07-31-2014 |
20140213713 | TIRE RUBBER COMPOSITION AND PNEUMATIC TIRE - Provided are: a tire rubber composition improving fuel economy and abrasion resistance while maintaining good wet-grip performance or improving it; and a pneumatic tire including the same. The composition contains: a rubber component including a diene polymer (1); silica; and a diene polymer (2), the polymers (1) and (2) being modified diene polymers obtained by reacting components (A)-(B), the polymer (1) having a Mn of 110000-1500000, the polymer (2) having a Mn of 1000-100000, the amount of polymer (2) being 2-25 parts by mass per 100 parts by mass of the rubber component, wherein (A): an active alkali metal-terminated conjugated diene polymer obtained by polymerizing a conjugated diene monomer alone or with an aromatic vinyl monomer, in the presence of a component (C); (B): a modifying agent containing a functional group; (C): a chemical species obtained by reacting an organic alkali metal compound with a compound of formula (1): | 07-31-2014 |
20140256847 | RUBBER COMPOSITION, AND PNEUMATIC TIRE - Provided are a rubber composition achieving balanced improvement in processability, fuel economy, rubber strength, abrasion resistance, wet-grip performance, and handling stability, and a pneumatic tire including the composition. The rubber composition includes, per 100% by mass of a rubber component, at least 35% by mass of SR, the composition including a conjugated diene polymer and a silica having N | 09-11-2014 |
20140275430 | RUBBER COMPOSITION AND PNEUMATIC TIRE - Provided are a rubber composition achieving balanced improvement in processability, fuel economy, rubber strength, abrasion resistance, and wet-grip performance, and a pneumatic tire thereof. The rubber composition includes a conjugated diene polymer and a silica having N | 09-18-2014 |
20140296376 | RUBBER COMPOSITION, AND PNEUMATIC TIRE - Provided are: a rubber composition a achieving balanced improvement in processability, fuel economy, rubber strength, abrasion resistance, wet-grip performance, and handling stability, and a pneumatic tire including the composition. Included is a rubber composition including a conjugated diene polymer and a silica having N | 10-02-2014 |
20140296413 | RUBBER COMPOSITION FOR TIRE, AND PNEUMATIC TIRE - Provided are a rubber composition for tires which provides both adhesion to fiber cords and conductivity even when an inexpensive conductive carbon black is used, and thus achieves a balanced improvement in conductivity, handling stability, fuel economy, elongation at break, adhesion to fiber cords, processability, and tire durability; and a pneumatic tire including the composition. The composition includes, per 100 parts by mass of a rubber component: 1.0-3.5 parts by mass of sulfur with an iron content of 30 ppm or less, calculated as the net sulfur content in the sulfur; and 0.5-15 parts by mass of conductive carbon black having a DBP of 300 ml/100 g or more and an iron content of 60 ppm or more, the composition having a total net sulfur content of 1.0-6.0 parts by mass per 100 parts by mass of the rubber component, and a volume resistivity of 1.0×10 | 10-02-2014 |
20140326928 | RUBBER COMPOSITION FOR TIRE, AND PNEUMATIC TIRE - Provided are a rubber composition for a tire which achieves a balanced improvement in tensile properties at break and fuel economy while providing excellent conductivity; and a pneumatic tire including the rubber composition. The present invention relates to a rubber composition for a tire, including: a rubber component; a carbon black having a nitrogen adsorption specific surface area of 20 to 110 m | 11-06-2014 |