There are provided a tire that combines a low elastic modulus at low temperatures with a high hysteresis loss at low temperatures and has excellent on-ice brake performance, and a vulcanized rubber and a rubber composition from which the tire is obtained. A rubber composition comprising a rubber component comprising a natural rubber, a polybutadiene rubber, and a styrene-butadiene copolymer rubber, and 50 to 90 parts by mass of a filler comprising silica relative to 100 parts by mass of the rubber component, wherein the mass n of the natural rubber in the rubber component is 40% by mass or more, the mass n, the mass b of the polybutadiene rubber, and the mass s of the styrene-butadiene copolymer rubber satisfy the relation: sbn, provided that when n=b, s<b, and 50% by mass or more of the silica is comprised in a phase comprising the polybutadiene rubber and the styrene-butadiene copolymer rubber.

In the present technology, a thermally expandable microcapsule complex is blended in a rubber component, the thermally expandable microcapsule complex being obtained by preparing an aqueous solution of a water-soluble polymer having a concentration of 1 to 30 mass %, adding from 5 to 60 parts by mass of cellulose fibers to 100 parts by mass of the aqueous solution to prepare a liquid dispersion (1), adding from 10 to 200 parts by mass of thermally expandable microcapsules to the liquid dispersion (1) to prepare a liquid dispersion 2), and evaporating the moisture content of the liquid dispersion (2).

A tire including a circular tire frame formed of a resin material that includes a thermoplastic resin and fibers.

Provided by the present invention are a rubber composition for studless winter tires capable of improving performance on snow and ice while maintaining good abrasion resistance, and a studless winter tire including the rubber composition. The present invention relates to a rubber composition for studless winter tires containing a rubber component and bionanofibers, the bionanofibers having an average fiber diameter of 0.1 m or less, the rubber component having a combined amount of natural rubber and polybutadiene rubber of 30% to 100% by mass based on 100% by mass of the rubber component, the rubber composition containing the bionanofibers in an amount of 1 to 10 parts by mass relative to 100 parts by mass of the rubber component.

Tire combining low elastic modulus at low temperatures with high hysteresis loss at low temperatures having excellent on-ice brake performance, and vulcanized rubber and a rubber composition from which the tire is obtained. A rubber composition comprising rubber component comprising a natural rubber, a polybutadiene rubber, and a styrene-butadiene copolymer rubber, and 50 to 90 parts by mass of a filler comprising silica relative to 100 parts by mass of the rubber component, wherein the mass n of the natural rubber in the rubber component is 40% by mass or more, the mass n, the mass b of the polybutadiene rubber, and the mass s of the styrene-butadiene copolymer rubber satisfy the relation: sbn, provided that when n=b, s<b, and 50% by mass or more of the silica is comprised in a phase comprising the polybutadiene rubber and the styrene-butadiene copolymer rubber.

A rubber composition has: at least three types of diene polymers forming a plurality of polymer phases immiscible with each other; and silica, wherein: a diene polymer (B), of which glass transition temperature (Tg) is neither the highest nor the lowest among the diene polymers each having content of 10% by mass with respect to the total mass of the diene polymers, has been modified by a compound containing silicon atom; the diene polymer (B) satisfies formula (i) shown below:

St+Vi/233 (i)

(In the formula, St represents content of bonded styrene (mass %) of the diene polymer (B) and Vi represents vinyl bond content (mass %) of a conjugated diene compound part of the diene polymer (B)); and the silica has content of 25 parts by mass with respect to the total mass or 100 parts by mass of the diene polymers.

The present invention provides a pneumatic tire having excellent fuel efficiency, handling stability, and ride quality while maintaining a good balance between them. Provided is a pneumatic tire including a tire component formed from a rubber composition, the rubber composition having cured rubber properties satisfying predetermined values.

A tread for a pneumatic tire includes tread pattern elements and cuts. Each tread pattern element includes lateral faces and a contact face that comes into contact with a road surface when the tire is being driven thereon. A boundary between the contact face and the lateral faces forms at least one edge corner. The cuts are formed as grooves and/or sipes, with the cuts being delimited by opposing lateral faces of the tread pattern elements. Each tread pattern element is formed of at least one rubber compound. When the tread is viewed in cross section in a plane normal to an axis of rotation of the tire and passing through a contact face of a tread pattern element, at least one of the cuts adjacent to that contact face is covered at least in part with a covering layer that contains a woven or nonwoven fiber assembly.

Provided are a rubber composition for studless winter tires that can improve not only performance on snow and ice but also abrasion resistance, thereby simultaneously achieving excellent performance on snow and ice and excellent abrasion resistance, and a studless winter tire formed from the rubber composition. The rubber composition for studless winter tires contains: a rubber component; a chemically modified microfibrillated cellulose; carbon black; and silica, the chemically modified microfibrillated cellulose having an average fiber diameter of 0.1 m or less, the rubber component having a combined amount of natural rubber and polybutadiene rubber of 30-100% by mass based on 100% by mass of the rubber component, the rubber composition containing, per 100 parts by mass of the rubber component, 1-10 parts by mass of the chemically modified microfibrillated cellulose, 10-80 parts by mass of the carbon black, and 10-80 parts by mass of the silica.

In the present technology, a thermally expandable microcapsule complex is blended in a rubber component, the thermally expandable microcapsule complex being obtained by preparing an aqueous solution of a water-soluble polymer having a concentration of 1 to 30 mass %, adding from 5 to 60 parts by mass of cellulose fibers to 100 parts by mass of the aqueous solution to prepare a liquid dispersion (1), adding from 10 to 200 parts by mass of thermally expandable microcapsules to the liquid dispersion (1) to prepare a liquid dispersion (2), and evaporating the moisture content of the liquid dispersion (2).