Abstract: An elastomer composition containing a styrene-based elastomer, and a temperature-responsive resin that changes its hydrophilicity with changes in temperature, the elastomer composition satisfying the following relationship at two given temperatures differing by at least 10° C.: (Contact angle at lower temperature)/(Contact angle at higher temperature)?0.90, the lower temperature being lower than 25° C.

Abstract: An elastomer composition, containing a butadiene-based elastomer, and a temperature-responsive resin that changes its hydrophilicity with changes in temperature, the elastomer composition satisfying the following relationships at two given temperatures differing by at least 10° C.: (Elastic modulus at lower temperature and when immersed in water)/(Elastic modulus at lower temperature and when dry)?0.95, and (Elastic modulus at higher temperature and when immersed in water)/(Elastic modulus at higher temperature and when dry)>0.95, the lower temperature being lower than 25° C.

Abstract: The present invention provides a rubber composition for treads, containing: a rubber component including an isoprene-based rubber and polybutadiene rubber; silica; carbon black; a terpene-based resin; and a water-soluble fine particle and/or a foaming agent, the terpene-based resin having a softening point of 70-150° C., an ?-pinene unit content of 65-100% by mass, and a ?-pinene unit content of 0-35% by mass, the rubber component including, based on 100% by mass thereof, 20-80% by mass of the isoprene-based rubber and 20-80% by mass of the polybutadiene rubber, with a combined amount of the isoprene-based rubber and the polybutadiene rubber of 90% by mass or more, the rubber composition containing, per 100 parts by mass of the rubber component, 20-200 parts by mass of the silica, 0.1-50 parts by mass of the carbon black, and 0.1-50 parts by mass of the terpene-based resin.

Abstract: Provided are a rubber composition for tires that provides a balanced improvement of snow and ice performance and abrasion resistance, and a tire including the rubber composition. The rubber composition for tires contains: a rubber component including an isoprene-based rubber and BR; silica; and a terpene-based resin having a softening point of 60-150° C., an ?-pinene unit content of 65-100% by mass, a ?-pinene unit content of 0-35% by mass, and a limonene unit content of 10% by mass or lower, the rubber component including, based on 100% by mass thereof, 5-80% by mass of the isoprene-based rubber and 5-80% by mass of the BR, with a combined amount of the isoprene-based rubber and the BR of 60% by mass or more, the rubber composition containing, per 100 parts by mass of the rubber component, 1-500 parts by mass of the silica and 0.1-100 parts by mass of the terpene-based resin.

Abstract: The present invention provides a rubber composition for studless winter tires that provides improved performance on ice and a studless winter tire including the rubber composition. The present invention relates to a tread rubber composition for studless winter tires containing: a rubber component including an isoprene-based rubber and a conjugated diene polymer; a water-soluble fine particle; and a liquid plasticizer, the liquid plasticizer being present in an amount of 30 parts by mass or less per 100 parts by mass of the rubber component.

Abstract: Provided are a rubber composition for tires that provides a balanced improvement of snow and ice performance and abrasion resistance, and a tire including the rubber composition. The rubber composition for tires contains: a rubber component including an isoprene-based rubber and BR; silica; and a terpene-based resin having a softening point of 60-150° C., an ?-pinene unit content of 65-100% by mass, a ?-pinene unit content of 0-35% by mass, and a limonene unit content of 10% by mass or lower, the rubber component including, based on 100% by mass thereof, 5-80% by mass of the isoprene-based rubber and 5-80% by mass of the BR, with a combined amount of the isoprene-based rubber and the BR of 60% by mass or more, the rubber composition containing, per 100 parts by mass of the rubber component, 1-500 parts by mass of the silica and 0.1-100 parts by mass of the terpene-based resin.

Abstract: The present invention provides a rubber composition for treads, containing: a rubber component including an isoprene-based rubber and polybutadiene rubber; silica; carbon black; a terpene-based resin; and a water-soluble fine particle and/or a foaming agent, the terpene-based resin having a softening point of 70-150° C., an ?-pinene unit content of 65-100% by mass, and a ?-pinene unit content of 0-35% by mass, the rubber component including, based on 100% by mass thereof, 20-80% by mass of the isoprene-based rubber and 20-80% by mass of the polybutadiene rubber, with a combined amount of the isoprene-based rubber and the polybutadiene rubber of 90% by mass or more, the rubber composition containing, per 100 parts by mass of the rubber component, 20-200 parts by mass of the silica, 0.1-50 parts by mass of the carbon black, and 0.1-50 parts by mass of the terpene-based resin.

Abstract: The present invention provides a rubber composition for tires that provides a balanced improvement of grip performance, fuel economy, and abrasion resistance. Included is a rubber composition for tires, containing a rubber component and a terpene-based resin, the rubber component including, based on 100% by mass thereof, 5-100% by mass of styrene butadiene rubber and 0-80% by mass of polybutadiene rubber, with a combined amount of the styrene butadiene rubber and the polybutadiene rubber of 80% by mass or more, the terpene-based resin having a softening point of 70-150° C., an ?-pinene unit content of 65-100% by mass, a ?-pinene unit content of 0-35% by mass, and a limonene unit content of 10% by mass or lower, the rubber composition containing, per 100 parts by mass of the rubber component, 0-500 parts by mass of silica and 0.1-100 parts by mass of the terpene-based resin.