Abstract: This invention relates to a pneumatic tire comprising a pair of bead portions (1), a pair of sidewall portions (2), a tread portion (3) continuing to both the sidewall portions (2), a carcass (4) composed of one or more carcass plies toroidally extending between the pair of bead portions and reinforcing these potions and a pair of side reinforcing rubber layers (5) each disposed on an inside of the carcass (4) at the sidewall portion (2), wherein the carcass ply is formed by covering reinforcing cords with a coating rubber and a rubber composition having a loss tangent (tan ?) at 25° C. and 1% strain of not higher than 0.12 is applied to the coating rubber, and/or a rubber composition having a loss tangent (tan ?) at 25° C and 1% strain of not higher than 0.15 is applied to the sidewall portion (2).

Abstract: Provided is an annular supporter for a run-flat tire which comprises a supporting part and a leg part and which can support a load in run-flat running, wherein the leg part comprises a rubber composition comprising a rubber component which contains 60 mass parts or more of a conjugate diene base rubber such as isoprene rubber or natural rubber per 100 mass parts of the rubber component.

Abstract: A pneumatic tire which offers extremely excellent durability through inclusion of a belt portion composed of a rubber composition having excellent reinforcing properties, high hardness, low heat build-up properties, excellent deterioration resistance, and excellent adhesiveness to steel cords, wherein the rubber composition contains a natural rubber prepared by graft polymerizing a natural rubber latex with a polar group-containing monomer, and solidifying and drying the resulting product. A pneumatic tire which offers excellent rolling resistance through inclusion of a ply coating rubber, squeegee rubber, or tie rubber composed of a rubber composition containing a modified natural rubber prepared by graft polymerizing a natural rubber latex with a polar group-containing monomer, and solidifying and drying the resulting product.

Abstract: A tire which has a bead filler (5) arranged on the outside in the tire radius direction of one pair of bead sections provided at the right and left thereof, one pair of side wall sections (6) provided in the right and left of a tread section, and a rubber reinforcing layer (7) arranged in the side wall section (6), characterized in that the rubber composition constituting the bead filler (5) or the rubber reinforcing layer (7) comprises a conjugated diene based polymer having a vinyl bond content of 25% or more, a weight average molecular weight (Mw) of 200,000 to 900,000 and a molecular weight distribution (Mw/Mn) represented by the ratio of a weight average molecular weight (Mw) to a number average molecular weight (Mn) of 1 to 4 in an amount of 50 mass % or more of the rubber component thereof, and a resin and a curing agent therefor in a total amount of 3 parts by mass or more relative to 100 mass parts of the rubber, and exhibits a modulus of elasticity at 100% elongation at 25° C.

Abstract: In a pneumatic tire of the present invention, a tread reinforcing rubber layer composed of a rubber having larger tensile modulus of elasticity than that of a rubber composing the tread rubber layer and is less stretchable is provided in a thickness direction central area of a tread rubber layer. Because the tread reinforcing rubber layer diminishes the amount of lateral expansion and the amount of vertical compressive deformation when the tread rubber layer contacts the ground, generation of heat in the tread rubber layer can be suppressed. Therefore, in the present invention, the unique tread structure reliably suppresses heat-generation and the rubber of the tread rubber layer exhibits excellent tire wear resistance. As a result, suppression of heat-generation and high tire resistance can readily be achieved simultaneously.

Abstract: Players input their messages in their video game apparatuses and the messages are once collected at a server apparatus, thereafter they are distributed to all video game apparatuses from the game server apparatus. In a display screen of each video game apparatus, a chat window is displayed in order to display messages exchanged between the players on a game screen including a field and characters of the game. The chat window is sequentially enlarged up to a preset maximum number of lines when a new message is received from the game server apparatus. The chat window is sequentially reduced to the preset minimum number of lines when a predetermined time passes without any reception of new message or when the player performs a specific operation.

Abstract: In a heavy duty pneumatic tire comprising a tread, the tread is made of a rubber composition comprising 20-67 parts by weight of carbon black and 3-20 parts by weight of silica based on 100 parts by weight of diene based rubber, wherein the carbon black has a ratio of a dibutyl phthalate (DBP) absorption to a 24M4 DBP absorption (DBP absorption/24M4 DBP absorption) of not less than 1.20 and a ratio of the DBP absorption to a nitrogen adsorption specific area (N2SA) of not less than 0.8.

Abstract: In a pneumatic tire of the present invention, a tread reinforcing rubber layer composed of a rubber having larger tensile modulus of elasticity than that of a rubber composing the tread rubber layer and is less stretchable is provided in a thickness direction central area of a tread rubber layer. Because the tread reinforcing rubber layer diminishes the amount of lateral expansion and the amount of vertical compressive deformation when the tread rubber layer contacts the ground, generation of heat in the tread rubber layer can be suppressed. Therefore, in the present invention, the unique tread structure reliably suppresses heat-generation and the rubber of the tread rubber layer exhibits excellent tire wear resistance. As a result, suppression of heat-generation and high tire resistance can readily be achieved simultaneously.

Abstract: A rubber composition prepared by compounding 0.05 to 20 parts by weight of at least one selected from substituted hydrazide compounds represented by the following Formulas (I) to (IV) per 100 parts by weight of a rubber component comprising at least one rubber selected from the group consisting of natural rubber and synthetic rubber, and a pneumatic tire using the same: wherein A represents one selected from the group consisting of an aromatic group which may have a substituent, a hydantoin ring which may have a substituent, and a saturated or unsaturated linear hydrocarbon having 1 to 18 carbon atoms; Y represents hydrogen, an amino group, an alkyl group having 1 to 18 carbon atoms, a cycloalkyl group, an alkenyl group, an aromatic group, a pyridyl group or hydrazino group; and R1 to R11 each represent hydrogen, an alkyl group having 1 to 18 carbon atoms, a cycloalkyl group or an aromatic group.

Abstract: In a heavy duty pneumatic tire comprising a tread, the tread is made of a rubber composition comprising 20-67 parts by weight of carbon black and 3-20 parts by weight of silica based on 100 parts by weight of diene based rubber, wherein the carbon black has a ratio of a dibutyl phthalate (DBP) absorption to a 24M4 DBP absorption (DBP absorption/24M4 DBP absorption) of not less than 1.20 and a ratio of the DBP absorption to a nitrogen adsorption specific area (N2SA) of not less than 0.8.

Abstract: There is disclosed a pneumatic tire for heavy duty use having a tread which is composed of a rubber composition comprising 100 parts by weight of an (A) isoprene-based rubber and 30 to 70 parts by weight of (B) carbon black which has a nitrogen-adsorption specific surface area (BET) of 120 to 160 m2/g; a dibutyl phthalate absorption amount (DBP) of 80 to 130 ml/100 g; a most frequent value of aggregate diameter distribution (Dst) of 60 to 70 nm; and a half peak width (&Dgr;D50) of 65 to 80 nm, and as the case may be, 3 to 20 parts by weight of (C) silica which has a nitrogen-adsorption specific surface area (BET) of 210 to 260 m2/g; and an oil absorption amount of 200 to 260 ml/100 g. The above pneumatic tire is capable of enhancing the low heat-buildup property without detriment to the abrasion resistance of a tread rubber, and favorably reconciling both the low heat-buildup property and the abrasion resistance of itself.

Abstract: A pneumatic tire for heavy loads having a rubber composition for a tread rubber for a construction vehicle or the like, containing carbon black having a nitrogen adsorption specific surface area of 100 to 160 m.sup.2 /g, and an oil (dibutyl phthalate) absorption amount (DBP) of 80 to 130 ml/100 g, and silica having a nitrogen adsorption specific surface area of 210 to 260 m.sup.2 /g, and an oil absorption amount of 200 to 260 ml/100 g, by a total content of 40 to 70 parts by weight, in 100 parts by weight of isoprene rubber material, wherein the rubber composition contains 3 to 15 parts by weight of the total content. Further, the rubber composition contains 30 to 50 parts by weight of carbon black having a nitrogen adsorption specific surface area of 130 to 180 m.sup.2 /g, and an oil (dibutyl phthalate) absorption amount (DBP) of 80 to 120 ml/100 g, and 5 to 15 parts by weight of silica having a nitrogen adsorption specific surface area of 170 m.sup.2 /g or more, and 2.

Abstract: A rubber composition contains 100 parts by weight of natural rubber and/or a diene type synthetic rubber and 20-70 parts by weight of carbon black having the following characteristics:(1) N.sub.2 SA: 70.about.145 m.sup.2 /gr;(2) DBP: 160.about.200 ml/100gr;(3) 24M4DBP: 130.about.150 ml/100gr;(4) DBP-24M4DBP=.DELTA.DBP.ltoreq.1.25.times.DBP-172.5;(5) N.sub.2 SA/IA: 1.1.about.1.4; and(6) .DELTA.D.sub.50 /dst: 0.50.about.0.80.

Abstract: A rubber composition including 100 parts by weight of natural rubber and/or diene synthetic rubber and 30-100 parts by weight of carbon black having the following characteristics:(1) 24M4DBP of 0.95-1.30 ml/g;(2) D.sub.st of 50-80 nm;(3) .DELTA.D.sub.50 /D.sub.st of 0.55-0.75;(4) .DELTA.D.sub.10 /D.sub.st of 1.0-1.5;(5) a component ratio of 20% or less; and(6) CTAB of 120-180 m.sup.2 /g.The rubber composition is excellent in abrasion resistance without compromising low heat generation property and processability thereof.