Abstract: An object is to provide a winter tire being excellent in performance on ice and performance for inhibiting clogging with snow and accretion of snow. The present invention relates to a winter tire having a tread composed of a rubber composition comprising 2.5 to 30 parts by mass of a cyclopentadiene-based resin and 5 to 100 parts by mass of silica based on 100 parts by mass of a rubber component comprising a natural rubber.

Abstract: According to the process for preparing a vulcanized rubber composition of the invention comprising (a) a step of preparing a master batch comprising a modified conjugated diene polymer and silica, (b) a step of preparing a master batch comprising an isoprene rubber and silica, (c) a step of kneading the master batch obtained in (a) and the master batch obtained in (b), and (d) a step of vulcanizing a kneaded product obtained in (c), wherein the obtained vulcanized rubber composition comprises a phase A comprising a modified conjugated diene polymer and a phase B comprising an isoprene rubber, which are incompatible with each other, an abundance ratio ? of silica in the phase A satisfies 0.5???0.9 (Relation 1), and a proportion ? of the modified conjugated diene polymer satisfies 0.4???0.

Abstract: An object is to provide a winter tire being excellent in performance on ice and performance for inhibiting clogging with snow and accretion of snow. The present invention relates to a winter tire having a tread composed of a rubber composition comprising 2.5 to 30 parts by mass of a cyclopentadiene-based resin and 5 to 100 parts by mass of silica based on 100 parts by mass of a rubber component comprising a natural rubber.

Abstract: There is provided a pneumatic tire having improved wet grip performance and fuel efficiency in a good balance. The pneumatic tire is provided with a tread composed of a rubber composition comprising not less than 0.5 part by mass of silica and 5 to 50 parts by mass of a resin having a melt viscosity (150° C.) of 12000 to 15000 mPa·s based on 100 parts by mass of a rubber component. The rubber component comprises 40 to 100% by mass of a styrene-butadiene rubber and 0 to 60% by mass of a butadiene rubber. The resin is selected from the group consisting of a terpene phenol resin, a phenol resin and an alkylphenol resin.

Abstract: A purpose of the present invention is to provide a tire assuring that clogging of snow and sticking of snow are inhibited, particularly a tire assuring that clogging of snow and sticking of snow can be inhibited and having good performance on ice and snow and abrasion resistance without depending on the tread pattern form while maintaining wet grip performance and abrasion resistance. The tire is composed of a rubber composition which comprises a rubber component comprising a modified butadiene rubber and silica and has a pure water contact angle of from 125° to 140°.

Abstract: A pneumatic tire is provided with a tread composed of a rubber composition comprising not less than 0.5 part by mass of silica and not less than 5 parts by mass of a rosin ester resin based on 100 parts by mass of a rubber component comprising 40 to 100% by mass of a styrene-butadiene rubber and 0 to 60% by mass of a butadiene rubber, wherein an adhesive force of the rubber composition measured by the specified adhesion test method is not less than 400 when an adhesive force of a reference rubber composition wherein the whole amount of resin has been replaced by oil is assumed to be 100.

Abstract: According to the process for preparing a vulcanized rubber composition of the invention comprising (a) a step of preparing a master batch comprising a butadiene rubber and silica, (b) a step of preparing a master batch comprising an isoprene rubber and silica, (c) a step of kneading the master batch obtained in (a) and the master batch obtained in (b), and (d) a step of vulcanizing a kneaded product obtained in (c), wherein the obtained vulcanized rubber composition comprises a BR phase and a IR phase, which are incompatible with each other, a predetermined abundance ratio ? of silica in the BR phase satisfies 0.3???0.7 (Relation 1), and a proportion ? of the butadiene rubber satisfies 0.4???0.8 (Relation 2) it is possible to improve performance on ice and abrasion resistance and to provide a vulcanized rubber composition having excellent performance on ice and abrasion resistance, and a studless tire with a tread made using the same.

Abstract: According to the process for preparing a vulcanized rubber composition of the invention comprising (a) a step of preparing a master batch comprising a butadiene rubber and silica, (b) a step of preparing a master batch comprising an isoprene rubber and silica, (c) a step of kneading the master batch obtained in (a) and the master batch obtained in (b), and (d) a step of vulcanizing a kneaded product obtained in (c), wherein the obtained vulcanized rubber composition has a BR phase and a IR phase which are incompatible with each other and comprises a predetermined amount of a terpene resin, a predetermined abundance ratio ? of silica in the BR phase satisfies 0.3???0.7 (Relation 1), and a proportion ? of the butadiene rubber satisfies 0.4???0.

Abstract: According to the process for preparing a vulcanized rubber composition of the invention comprising (a) a step of preparing a master batch comprising a modified conjugated diene polymer and silica, (b) a step of preparing a master batch comprising an isoprene rubber and silica, (c) a step of kneading the master batch obtained in (a) and the master batch obtained in (b), and (d) a step of vulcanizing a kneaded product obtained in (c), wherein the obtained vulcanized rubber composition comprises a phase A comprising a modified conjugated diene polymer and a phase B comprising an isoprene rubber, which are incompatible with each other, an abundance ratio ? of silica in the phase A satisfies 0.5???0.9 (Relation 1), and a proportion ? of the modified conjugated diene polymer satisfies 0.4???0.

Abstract: A purpose of the present invention is to provide a tire assuring that clogging of snow and sticking of snow are inhibited, particularly a tire assuring that clogging of snow and sticking of snow can be inhibited and having good performance on ice and snow and abrasion resistance without depending on the tread pattern form while maintaining wet grip performance and abrasion resistance. The tire is composed of a rubber composition which comprises a rubber component comprising a modified butadiene rubber and silica and has a pure water contact angle of from 125° to 140°.

Abstract: A novel gas separation membrane having excellent gas permeability and gas separation performance, particularly carbon dioxide (CO2) permeability and excellent separation performance of carbon dioxide to methane (CH4) is provided. Moreover, a novel gas separation membrane having excellent heat resistance, chemical resistance and strength etc. is preferably provided. A gas separation membrane comprising a resin comprising a branched polybenzoxazole has excellent gas permeability and gas separation performance, particularly excellent carbon dioxide (CO2) permeability and excellent separation performance of carbon dioxide to methane (CH4). The resin comprising a branched polybenzoxazole preferably has a cross-linked structure. Furthermore, the resin comprising a branched polybenzoxazole is preferably a hybrid with silica.

Abstract: The present invention provides a studless winter tire including a tread (a cap tread in the case of a multi-layered tread) which exhibits a reduced increase in hardness at low temperatures and achieves a balanced improvement in both performance on ice and snow and abrasion resistance. The present invention also provides a studless winter tire including a base tread which exhibits a reduced increase in hardness at low temperatures and achieves a balanced improvement in both performance on ice and snow and durability. The studless winter tires include a tread or base tread formed from a rubber composition that contains predetermined amounts of silica and a rubber component including natural rubber and a specific modified conjugated diene polymer.

Abstract: A novel gas separation membrane having excellent gas permeability and gas separation performance, particularly carbon dioxide (CO2) permeability and excellent separation performance of carbon dioxide to methane (CH4) is provided. Moreover, a novel gas separation membrane having excellent heat resistance, chemical resistance and strength etc. is preferably provided. A gas separation membrane comprising a resin comprising a branched polybenzoxazole has excellent gas permeability and gas separation performance, particularly excellent carbon dioxide (CO2) permeability and excellent separation performance of carbon dioxide to methane (CH4). The resin comprising a branched polybenzoxazole preferably has a cross-linked structure. Furthermore, the resin comprising a branched polybenzoxazole is preferably a hybrid with silica.