Abstract: An object of the present invention is to provide a rubber composition for a heavy-load tire having excellent low heat build-up when formed into a tire and excellent flowability of the rubber during vulcanization, and a pneumatic tire produced using the rubber composition. The rubber composition for a heavy-load tire contains a diene rubber and a carbon black; the diene rubber containing: a natural rubber; and a modified polymer obtained by modifying a conjugated diene polymer with a nitrone compound; the content of the natural rubber in the diene rubber being not less than 60 mass %; and the content of the modified polymer in the diene rubber being not greater than 40 mass %; and the content of the carbon black being from 30 to 70 parts by mass per 100 parts by mass of the diene rubber.

Abstract: The present invention is to provide a polymer modifying agent composition which provides a modified polymer that exhibits excellent low heat build-up when formed into a vulcanized product. The polymer modifying agent composition is a polymer modifying agent composition modifying a polymer having a carbon-carbon unsaturated bond, and containing (A) a nitrone having at least one carboxy group and (B) a fatty acid having 6 or more carbons.

Abstract: A rubber composition for tire bead insulation contains a diene rubber, a nitrone compound having a carboxy group, a carbon black and a white filler. The diene rubber contains a natural rubber and a styrene-butadiene rubber and the mass ratio of the contents of the natural rubber and the butadiene rubber is from 50:50 to 90:10. The content of the nitrone compound is from 0.1 to 10 parts by mass (PBM) per 100 PBM of total content of the diene rubber and the nitrone compound. The content of the carbon black is not less than 70 PBM per 100 PBM of the total above. The content of the white filler is not less than 20 PBM per 100 PBM of the total above. The total content of the carbon black and the white filler is from 90 to 180 PBM per 100 PBM of the total above.

Abstract: A polyamide elastomer-containing rubber composition according to the present technology comprises, 100 parts by mass of (A) a diene rubber, from 30 to 80 parts by mass of (B) carbon black having a nitrogen adsorption specific surface area (N2SA) of at least 35 m2/g and from 1 to 30 parts by mass of (C) a polyamide elastomer, the mass ratio of the (B) carbon black to the (C) polyamide elastomer being 1:0.35 to 1:1.

Abstract: The present technology provides a rubber composition comprising 100 parts by mass of (A) diene rubber, from 10 to 120 parts by mass of (B) carbon black, from 1 to 50 parts by mass of a (C) polyamide elastomer, and from 0.01 to 1.2 parts by mass of a (D) sulfenamide-based vulcanization retarder.

Abstract: A rubber composition for a bead filler contains a diene rubber, a carbon black and a nitrone compound having a carboxy group; the diene rubber contains a natural rubber and a styrene-butadiene rubber, wherein the content of the natural rubber in a total of the diene rubber and the nitrone compound is not less than 60 mass %, and the content of the styrene-butadiene rubber in a total of the diene rubber and the nitrone compound is not greater than 40 mass %; the content of the carbon black is 40 to 80 parts by mass per 100 parts by mass of a total of the diene rubber and the nitrone compound; and the content of the nitrone compound is 0.1 to 10 parts by mass per 100 parts by mass of a total of the diene rubber and the nitrone compound. Such rubber composition exhibits low heat build-up after vulcanization.

Abstract: A rubber composition for tire bead insulation contains a diene rubber, a nitrone compound having a carboxy group, a carbon black and a white filler. The diene rubber contains a natural rubber and a styrene-butadiene rubber and the mass ratio of the contents of the natural rubber and the butadiene rubber is from 50:50 to 90:10. The content of the nitrone compound is from 0.1 to 10 parts by mass (PBM) per 100 PBM of total content of the diene rubber and the nitrone compound. The content of the carbon black is not less than 70 PBM per 100 PBM of the total above. The content of the white filler is not less than 20 PBM per 100 PBM of the total above. The total content of the carbon black and the white filler is from 90 to 180 PBM per 100 PBM of the total above.

Abstract: An object of the present invention is to provide a rubber composition for a sidewall having excellent low heat build-up and durability when formed into a tire, and a pneumatic tire using the rubber composition. The rubber composition for a sidewall according to the present invention comprises a diene rubber and carbon black; the diene rubber comprising: a modified polymer obtained by reacting a nitrone compound with double bonds of a conjugated diene polymer; and a natural rubber; a content of the modified polymer in the diene rubber being from 8 to 65 mass %; a nitrogen adsorption specific surface area of the carbon black being from 20 to 60 [×103 m2/kg]; and a content of the carbon black being from 30 to 67 parts by mass per 100 parts by mass of the diene rubber.

Abstract: A rubber composition for a bead filler contains a diene rubber, a carbon black and a nitrone compound having a carboxy group; the diene rubber contains a natural rubber and a styrene-butadiene rubber, wherein the content of the natural rubber in a total of the diene rubber and the nitrone compound is not less than 60 mass %, and the content of the styrene-butadiene rubber in a total of the diene rubber and the nitrone compound is not greater than 40 mass %; the content of the carbon black is 40 to 80 parts by mass per 100 parts by mass of a total of the diene rubber and the nitrone compound; and the content of the nitrone compound is 0.1 to 10 parts by mass per 100 parts by mass of a total of the diene rubber and the nitrone compound. Such rubber composition exhibits low heat build-up after vulcanization.

Abstract: A rubber composition for coating a fiber cord includes a diene rubber, a carbon black, and a nitrone compound having a carboxy group; the diene rubber includes a natural rubber and a styrene-butadiene rubber and/or a butadiene rubber, wherein a content of the natural rubber in a total of the diene rubber and the nitrone compound is not greater than 65 mass %; a content of the carbon black is 40 to 67 parts by mass per 100 parts by mass of a total of the diene rubber and the nitrone compound; and a content of the nitrone compound is 0.1 to 10 parts by mass per 100 parts by mass of a total of the diene rubber and the nitrone compound. Such rubber composition for coating a fiber cord has excellent low heat build-up when a tire is produced and excellent adhesiveness with carcass cord.

Abstract: The present invention provides a rubber composition for an undertread, the rubber composition achieving excellent low heat build-up and high elastic modulus when formed into a tire; and a pneumatic tire that includes the rubber composition. The rubber composition for an undertread contains a diene rubber and a carbon black. The diene rubber contains a natural rubber and a modified polymer that is obtained by reacting a nitrone compound with a double bond of a conjugated diene polymer. The content of the natural rubber in the diene rubber is 60 mass % or greater, the content of the modified polymer in the diene rubber is from 8 to 40 mass %, the content of the carbon black is from 30 to 67 parts by mass per 100 parts by mass of the diene rubber, and the nitrogen adsorption specific surface area of the carbon black is from 20 to 60 m2/g.

Abstract: A rubber composition for a tire rim cushion or rubber finishing contains a diene rubber and a filler containing a carbon black. The diene rubber contains a natural rubber and/or an isoprene rubber, and a modified polymer that is obtained by reacting a nitrone compound with a double bond of a conjugated diene polymer. The content of the natural rubber and/or the isoprene rubber in the diene rubber is from 30 to 60 mass %, the content of the modified polymer in the diene rubber is from 8 to 70 mass %, the content of the filler is from 60 to 90 parts by mass per 100 parts by mass of the diene rubber, and the nitrogen adsorption specific surface area of the carbon black is from 60 to 150 m2/g. Such rubber composition has excellent low heat build-up and ozone resistance when formed into a tire.

Abstract: An object of the present invention is to provide a modified polymer that can realize a rubber composition having excellent low heat build-up and that has excellent productivity, a rubber composition containing the modified polymer, and a tire produced using the rubber composition. The modified polymer of the present invention is obtained by reacting a modifier having a nitrone group and a carboxy group with a conjugated diene polymer not containing a tetrasubstituted olefin and/or a trisubstituted olefin.

Abstract: An object of the present invention is to provide a rubber composition capable of producing a pneumatic tire with both satisfactory heat build-up reduction and excellent wet skid performance, and a pneumatic tire comprising the rubber composition. The rubber composition of the present invention contains a diene-based rubber containing from 5 to 40 mass % of a modified butadiene rubber and a white filler. The modified butadiene rubber is a modified polymer obtained by modifying an unmodified butadiene rubber (A) with a nitrone compound (B) having a carboxy group.

Abstract: The present invention is to provide a polymer modifying agent composition which provides a modified polymer that exhibits excellent low heat build-up when formed into a vulcanized product. The polymer modifying agent composition is a polymer modifying agent composition modifying a polymer having a carbon-carbon unsaturated bond, and containing (A) a nitrone having at least one carboxy group and (B) a fatty acid having 6 or more carbons.

Abstract: An object of the present invention is to provide a rubber composition capable of producing a pneumatic tire with both excellent low rolling resistance and wet grip performance, and a pneumatic tire comprising the rubber composition. The rubber composition comprises: a diene-based rubber containing 10 mass % or greater of a modified diene polymer; and an aromatic modified terpene resin; wherein the modified diene polymer is a modified polymer obtained by modifying an unmodified diene polymer (A) with a nitrone compound (B) having a carboxy group; and a content of the aromatic modified terpene resin is from 0.1 to 50 parts by mass per 100 parts by mass of the diene-based rubber.

Abstract: The purpose of the present invention is to provide a modified polymer that significantly reduces heat build-up due to the modification when the modified polymer is formed into a rubber composition, a rubber composition containing the modified polymer, and a pneumatic tire in which the rubber composition is used. The modified polymer of the present invention is a modified polymer obtained by modifying a styrene-conjugated diene copolymer (A) with a nitrone compound (B). In the modified polymer, the content of styrene units in the styrene-conjugated diene copolymer (A) is 10% by mass or greater, and the proportion of vinyl bonds among all the double bonds contained in the styrene-conjugated diene copolymer (A) is 5 mol % or greater.

Abstract: A method for producing a pneumatic tire according to the present invention can use existing facilities without change and does not make the spliced parts of an inner liner easily opened even if the tire is produced with use of an inner liner having a low adhesion. In a method for producing a pneumatic tire having steps of winding an inner liner 8? around a tire building drum 21 to form a cylindrical body, the cylindrical body is formed by attaching a winding-starting end 8?a of the inner liner 8? to the building drum 21 via an uncured tacky member 9?, winding the inner liner 8? attached to the building drum 21 around the building drum21, and splicing a winding-finishing end side of the wound inner liner 8? with the winding-starting end 8?a of the inner liner 8? via the uncured tacky member 9?.

Abstract: A pneumatic tire using, as an inner liner layer, a thermoplastic elastomer comprising a thermoplastic resin matrix, in which a rubber component is dispersed a surface of the inner liner layer is covered with a protective layer, whereby a weathering resistance, damage resistance and fatigue resistance of the film liner of the inner liner layer at the time of tire storage are improved.

Abstract: A vulcanizable layered composition comprising at least two layers and at least one tie layer, wherein the first layer of the two layers is a fluid permeation prevention layer preferably comprising: (A) at least one thermoplastic engineering component and (B) at least one elastomer component; the second layer of the two layers comprises at least one high diene rubber and the tie layer comprises a mixture of: (1) at least one halogenated isobutylene containing elastomer; (2) up to 50 weight % of at least one high diene elastomer; (3) at least one filler; (4) up to 30 weight % of at least one processing oil; (5) at least one tackifier; and (6) a curing system for the elastomers.