Abstract: In the phenolic resin to be blended with rubber of the present invention, when the total peak area in a chemical shift measured by 13C-NMR of 110 ppm or more and 160 ppm or less is taken as 100, the total peak area in 0 ppm or more and less than 60 ppm is 80 to 400 and the total peak area in 60 ppm or more and less than 110 ppm is 2 to 70.

Abstract: The invention provides a method for producing a modified conjugated diene (co)polymer, the method including comprising: a modification reaction step including causing an organic silane compound to react with a conjugated diene (co)polymer having an active site at the active site, the organic silane compound having a characteristic group for forming a silanol group through hydrolysis and, in the vicinity of the characteristic group, (i) a functional group which binds the organic silane compound to the conjugated diene (co)polymer via addition to or substitution at the active site and which promotes reaction between the silanol group and a reinforcing filler after the addition or substitution reaction, or (ii) a functional group which promotes reaction between the silanol group and a reinforcing filler, and a hydrolyzation step performed after the modification reaction step; a modified conjugated diene (co)polymer having, at a molecular end of the conjugated diene (co)polymer, a silanol group, and a functional

Abstract: The present invention relates to a run-flat tire employing a rubber composition capable of improving processability without reducing the durability during run-flat traveling. More specifically, the present invention relates to a run-flat tire comprising a bead filler 7 and a pair of side-reinforcing rubber layers 8. At least one of the bead filler 7 and the side-reinforcing rubber layer 8 employs a rubber composition obtained by adding 3 to 10 parts by mass of sulfur and 0.1 to 30 parts by mass of a low-molecular-weight conjugated diene-based polymer (B) having a weight average molecular weight in the range of 2,000 to 10,000, to 100 parts by mass of a rubber component (A) containing at least a natural rubber or polyisoprene rubber and having a weight average molecular weight in the range of 150,000 to 2,000,000.

Abstract: A rubber composition containing 100 parts by mass of a rubber component (A) comprising at least one rubber of natural rubber and synthetic diene base rubbers and 5 to 120 parts by mass of a low molecular weight aromatic vinyl compound-diene compound copolymer (B) having a weight average molecular weight (measured by gel permeation chromatography and reduced to polystyrene) of 1,000 to 300,000 and, wherein the copolymer (B) comprises 0 to 80% by mass of an aromatic vinyl compound and has a vinyl bond content of 0 to 80% by mass in the part of the diene compound, and has a cross-linkable functional group at an end. Further, tires produced by using the rubber composition are provided.

Abstract: In general the present invention provides a process for forming conjugated diene polymer, the process comprising the step of polymerizing conjugated diene monomer in the presence of a catalytically effective amount of a catalyst composition formed by combining (a) a nickel-containing compound, (b) an alkylating agent, (c) a fluorine-containing compound, (d) a carboxylic acid, and (e) an alcohol.

Abstract: The present invention provides a method for producing a rubber composition provided by compounding a rubber component (A) comprising at least one selected from natural rubbers and synthetic diene rubbers, a filler containing an inorganic filler (B), a silane coupling agent (C), and at least one vulcanization accelerator (D) selected from specific compounds, wherein the rubber composition is kneaded in a plurality of stages and wherein, in the first stage (X) of kneading, a portion (A?) of the rubber component (A), all or a portion of the inorganic filler (B), all or a portion of the silane coupling agent (C), and all or a portion of the vulcanization accelerator (D) are added and kneaded, and in or after the second stage of kneading, the residual portion (A?) of the rubber component (A) is added and kneaded, and the method for producing a rubber composition enables production of a rubber composition capable of suitably having a low-heat-generation property by further improving the coupling function activity o

Abstract: In general the present invention provides a process for forming conjugated diene polymer, the process comprising the step of polymerizing conjugated diene monomer in the presence of a catalytically effective amount of a catalyst composition formed by combining (a) a nickel-containing compound, (b) an alkylating agent, (c) a fluorine-containing compound, (d) a carboxylic acid, and (e) an alcohol.

Abstract: A rubber composition containing 100 parts by mass of a rubber component (A) comprising at least one rubber of natural rubber and synthetic diene base rubbers and 5 to 120 parts by mass of a low molecular weight aromatic vinyl compound-diene compound copolymer (B) having a weight average molecular weight (measured by gel permeation chromatography and reduced to polystyrene) of 1,000 to 300,000 and, wherein the copolymer (B) comprises 0 to 80% by mass of an aromatic vinyl compound and has a vinyl bond content of 0 to 80% by mass in the part of the diene compound, and has a cross-linkable functional group at an end. Further, tires produced by using the rubber composition are provided.

Abstract: In general the present invention provides a process for forming conjugated diene polymer, the process comprising the step of polymerizing conjugated diene monomer in the presence of a catalytically effective amount of a catalyst composition formed by combining (a) a nickel-containing compound, (b) an alkylating agent, (c) a fluorine-containing compound, (d) a carboxylic acid, and (e) an alcohol.

Abstract: A pneumatic tire prepared by using a rubber composition prepared by compounding precipitated silica with a rubber component comprising 100 parts by mass of a rubber component (A) comprising at least one of a natural rubber and a synthetic diene base rubber and 5 to 60 parts by mass of an aromatic vinyl compound-diene compound copolymer (B) having a weight average molecular weight of 4,000 to 250,000 which comprises 0 to 80% by mass of the aromatic vinyl compound and in which a vinyl bond content in the parts of the diene compound is 0 to 80% by mass, wherein a cetyltrimethylammonium bromide-adsorbing specific surface area (CTAB) (m2/g) of the precipitated silica and the mode Aac (nm) in diameters of primary aggregates thereof determined by acoustic measurement of particle size distribution satisfy equation (I) shown below: Aac??0.76×(CTAB)+274??(I) and an ignition loss (mass reduction % when heated at 750° C.

Abstract: The present invention relates to a run-flat tire employing a rubber composition capable of improving processability without reducing the durability during run-flat traveling. More specifically, the present invention relates to a run-flat tire comprising a bead filler 7 and a pair of side-reinforcing rubber layers 8. At least one of the bead filler 7 and the side-reinforcing rubber layer 8 employs a rubber composition obtained by adding 3 to 10 parts by mass of sulfur and 0.1 to 30 parts by mass of a low-molecular-weight conjugated diene-based polymer (B) having a weight average molecular weight in the range of 2,000 to 10,000, to 100 parts by mass of a rubber component (A) containing at least a natural rubber or polyisoprene rubber and having a weight average molecular weight in the range of 150,000 to 2,000,000.

Abstract: Disclosed is a pneumatic tire, in which turbulent flow-creating ridges extending from the inner circumference side to the outer circumference side are formed at intervals in the tire circumference direction on the tire surface of a tire side part, wherein: said turbulent flow-creating ridges have edge parts, as viewed in the sectional shape cut in the radial direction; the front wall angle, which is made between the front wall faces of the turbulent flow creating ridges to be hit by an air flow and the tire surface, ranges from 70o to 110o; and, as a side-reinforcing rubber constituting said tire side part, a rubber composition prepared by blending 100 parts by mass of a rubber component containing 10 mass % or more of a modified conjugated diene polymer, which is obtained by conducting a modification reaction between a terminus of a conjugated diene polymer and an alkoxysilane compound having a primary amino group or a precursor capable of forming a primary amino group through hydrolysis to thereby introduce

Abstract: The invention provides a method for producing a modified conjugated diene (co)polymer, the method including comprising: a modification reaction step including causing an organic silane compound to react with a conjugated diene (co)polymer having an active site at the active site, the organic silane compound having a characteristic group for forming a silanol group through hydrolysis and, in the vicinity of the characteristic group, (i) a functional group which binds the organic silane compound to the conjugated diene (co)polymer via addition to or substitution at the active site and which promotes reaction between the silanol group and a reinforcing filler after the addition or substitution reaction, or (ii) a functional group which promotes reaction between the silanol group and a reinforcing filler, and a hydrolyzation step performed after the modification reaction step; a modified conjugated diene (co)polymer having, at a molecular end of the conjugated diene (co)polymer, a silanol group, and a functional

Abstract: In general the present invention provides a process for forming conjugated diene polymer, the process comprising the step of polymerizing conjugated diene monomer in the presence of a catalytically effective amount of a catalyst composition formed by combining (a) a nickel-containing compound, (b) an alkylating agent, (c) a fluorine-containing compound, (d) a carboxylic acid, and (e) an alcohol.