Abstract: The present invention aims to provide a lightweight tire without decreasing durability and to reduce rolling resistance and improve steering stability of the tire. Specifically, the present invention relates to a rubber composition for a tire comprising 20 to 120 parts by weight of an inorganic filler, and 5 to 70 parts by weight of polyethylene powder, based on 100 parts by weight of diene rubber, the tire being prepared by kneading at 140° C. at most. The particle size of the polyethylene powder is preferably at most 500 &mgr;m.

Abstract: A rubber composition comprises 5 to 150 parts by weight of an inorganic filler, 0 to 30 parts by weight of a silane coupling agent and 5 to 100 parts by weight of a vegetable oil having an iodine number of at most 130, based on 100 parts by weight of a diene rubber. A natural rubber is preferably used as the diene rubber. The rubber composition can reduce rolling resistance with decreasing the amount of petroleum oils to be used.

Abstract: The present invention provides a studless tire excellent in performance on ice and snow in which digging friction is improved without losing adhesion friction. The studless tire has a tread comprising specific short fiber or plate-like material dispersed in diene rubber so as to be oriented in the tread thickness direction, wherein when measured at 25° C.

Abstract: The present invention provides a studless tire which has superior performance on ice and snow in which adhesion friction, digging friction and scratching friction of the tire to the road and abrasion resistance are improved and can maintain this performance. The studless tire has a tread comprising diene rubber and non-metal short fiber which is surface-treated in advance and dispersed in said diene rubber so as to be oriented in the tread thickness direction, wherein when measured at 25° C.

Abstract: A tread rubber composition improved both in grip performance on ice-covered and snow-covered road surfaces and in abrasion resistance is provided. The tread rubber composition contains aluminum hydroxide having an untamped density of not more than 0.60 g/cm3, a DOP oil absorption of at least 70 cm3/100 g and less than 250 cm3/100 g, and a BET specific surface area of at least 30 m2/g and not more than 350 m2/g in an amount of 5-60 parts by weight with respect to 100 parts by weight of a rubber component containing at least 50% by weight of at least one of polyisoprene rubber and polybutadiene rubber. The tread rubber composition has a tan&dgr; peak temperature of not more than −45° C. and a type A durometer hardness at 0° C. of not more than 64.

Abstract: Disclosed herein is an aluminum hydroxide having specific characteristics, and a tire tread rubber composition and a pneumatic tire employing the aluminum hydroxide, which allow grip performance and abrasion resistance to increase and rolling resistance to decrease and are superior in processibility. The aluminum hydroxide has a loosed bulk density of not more than 0.60 g/cm3, a DOP oil absorption of at least 70 cm3/100 g and less than 250 cm3/100 g, and a BET specific surface area of at least 30 m2/g and less than 350 m2/g. 5-150 parts by weight of the aluminum hydroxide is blended with 100 parts by weight of a rubber component to obtain the tire tread rubber composition. The rubber component preferably includes at least 60 parts by weight of styrene-butadiene rubber having a styrene content of 20-60% by weight.

Abstract: A rubber composition comprises 5 to 150 parts by weight of an inorganic filler, 0 to 30 parts by weight of a silane coupling agent and 5 to 100 parts by weight of a vegetable oil having an iodine number of at most 130, based on 100 parts by weight of a diene rubber. A natural rubber is preferably used as the diene rubber. The rubber composition can reduce rolling resistance with decreasing the amount of petroleum oils to be used.

Abstract: An earth-friendly tire using raw materials derived from non-petroleum resources instead of all or part of raw materials derived from petroleum resources currently used for tires.The tire is prepared by using a natural rubber instead of a synthetic rubber; an inorganic filler and/or a biofiller instead of carbon black; vegetable oil instead of petroleum oil; and natural fiber instead of synthetic fiber so that the tire comprises a non-petroleum raw material in an amount of at least 75% by weight based on the total weight of the tire.

Abstract: To provide a rubber composition for breaker having balanced properties among rigidity, heat resistance, adhesiveness, humid aging adhesion and elongation, and a pneumatic tire having a breaker layer or a belt layer comprising the rubber composition. A rubber composition for breaker comprises 55 to 65 parts by weight of carbon black, 5 to 15 parts by weight of silica, 3.5 to 4.5 parts by weight of sulfur, at least 0.08 part by weight of cobalt, a resorcinol resin and a methylene donor based on 100 parts by weight of a rubber component containing a natural rubber and/or an isoprene rubber as a main component.

Abstract: A method of manufacturing a pneumatic tire comprises assembling unvulcanized rubber components to make a green tire, vulcanizing the green tire, and winding an unvulcanized rubber tape so that the windings collectively have a predetermined cross sectional shape for at least one of the unvulcanized rubber components to thereby make said at least one of the unvulcanized rubber components.

Abstract: Aluminum hydroxide having specific characteristics, and a tire tread rubber composition and a pneumatic tire employing the aluminum hydroxide, which allow grip performance and abrasion resistance to increase and rolling resistance to decrease and are superior in processibility, are provided.

Abstract: A rubber composition suitable for use in tread of tires, having excellent rolling characteristics and abrasion resistance and an improved dimensional stability as not causing shrinkage when extruded into rubber sheets for treads, which comprises a rubber component, 20 to 60 parts by weight of silica, 3 to 12 parts by weight of a silane coupling agent, and 2 to 10 parts by weight of a short fiber, respectively, per 100 parts by weight of the rubber component.

Abstract: A pneumatic tire comprises a radially innermost belt ply having an axial width of from 0.8 to 1.2 times the tread width, a carcass with turnup portions having a radially outer end at a height of not more than 0.15 times the tire section height H, and a short fiber reinforcing layer having a thickness of from 0.3 to 1.0 mm disposed along the axially outer surface of the carcass in each of a pair of sidewall portions between the axial outer edge of the radially innermost belt ply and the radially outer end of the carcass turnup portion. The short fiber reinforcing layer is a compound of: 100 parts by weight of a base rubber compound containing 40 to 70 parts by weight of butadiene rubber and 60 to 30 parts by weight of natural rubber and/or isoprene rubber; 10 to 30 parts by weight of short fiber; and not more than 30 parts by weight of carbon black whose iodine number is in the range of from 30 to 90 mg/g.

Abstract: A rubber composition for a tire is provided which is excellent in wet grip performance on a wet road surface and in fuel saving performance. A tire tread and a tire which include such a rubber composition are also provided.

Abstract: Cap tread has a tan .delta. peak temperature of not less than -30.degree. C. Base tread comprises not less than 30 parts of a carbon black having an iodine adsorption number of 30 to 90 mg/g and not less than 10 parts of a short fiber oriented in the axial direction. Side wall comprises not more than 30 parts of the carbon black and not less than 10 parts by weight of the short fiber oriented in the peripheral direction. Bead apex comprises not less than 65 parts by weight of a carbon black which has an iodine adsorption number of 60 to 100 mg/g and not less than 20 parts by weight of the short fiber oriented in the axial direction or a direction which crosses the axial direction. This radial tire is light and has a low energy loss, and can provide an excellent steering stability.

Abstract: Rubber composition for a base tread, which is obtainable by blending, per 100 parts by weight of a rubber component, 30 to 55% by weight of a carbon black having an iodine adsorption value of from 40 to 100 g/kg, wherein the rubber component comprises (A) 20 to 55% by weight of a star shaped solution-polymerized butadiene rubber and (B) 45 to 80% by weight of a natural rubber or a natural rubber containing a diene rubber other than a star shaped solution-polymerized rubber in an amount of not more than 50% by weight. When using the above-mentioned rubber composition for the base tread of a base portion of a tread having a cap/base two-layer structure, it is possible to save fuel consumption of the tire because of small deformation and uniform shape.

Abstract: The present invention provides a rubber composition comprising:(i) a rubber component comprising 70 to 90% by weight of a styrene-butadiene copolymer rubber (A) containing 20 to 40% by weight of a styrene content and 30 to 60% by weight of a vinyl content in a butadiene portion, which is obtained by solution polymerization, and 10 to 30% by weight of a polybutadiene rubber (B)(ii) a vulcanizing agent in an amount of 0.75 to 1.75 parts by weight based on 100 parts by weight of the rubber component (i) and(iii) a plasticizer;wherein the plasticizer is present in an amount such that the amount of acetone extract obtained by extracting a vulcanized rubber sample obtained from the rubber composition with a Soxhlet apparatus in an acetone solvent for 24 hours is 20 to 26% by weight of the vulcanized rubber sample, and at least 80% by weight of the acetone extract being the plasticizer.

Abstract: The present invention provides an optimum radial tire which is suitable for each car. In the present invention, an .alpha. value is introduced as indicating the properties of the car and the tread rubber of the tire is selected according to the .alpha. value. Accordingly, the present invention provides a radial tire which comprises a tread and sidewall, wherein the tread has the claimed relation between a viscoelasticity (tan .delta.) peak temperature (Tp) and an .alpha. value which indicates the properties of a car, and a one side half width (w/2) of 25.degree. C. or less, the one side half width (W/2) being defined with respect to a viscoelasticity distribution curve as the distance along the 1/2 peak tan .delta. viscoelasticity line from the perpendicular line representing (Tp) to the intersection with the viscoelasticity distribution curve to the right of the perpendicular line.

Abstract: The present invention provides radial tires which exhibit physical properties in the diagonal area of FIG. 1 and which are suitable for passenger cars equipped with an anti-lock brake system. The radial tires of the present invention have an aspect ratio of 70% or less and comprises a tread, a pair of side walls, a pair of bead portions, each having a bead apex disposed therein, the bead apex having a JIS hardness or 85 or more, and a first and a second breaker, wherein the tread has a tan .delta. peak temperature (Tp) of -40.degree. to -5.degree. C., a one side half width (W/2) of 25.degree. C. or less and a JIS-A hardness of 56 to 72; the tan .delta. peak temperature (Tp) and the one side half width being obtained from a viscoelasticity (tan .delta.) temperature distribution curve which is determined using a viscoelastic spectrometer a frequency of 10 Hz, and initial strain of 10%, an amplitude of .+-.0.25% and a temperature elevating rate of 2.degree. C.

Abstract: The rubber composition comprising a cellulosic material containing-processed powder product and rubber components and a studless tire having a tread portion that contains said rubber composition which is improved in the performance of travelling over snow and ice is disclosed.