Abstract: A tire comprising at least a rubber composition based on at least a blend of natural rubber, NR, or synthetic polyisoprene, and a styrene-butadiene copolymer, SBR, the SBR having a content greater than or equal to 20 parts per hundred parts of elastomer, phr, a reinforcing filler comprising carbon black, characterized in that the composition comprises a plasticizing resin having a glass transition temperature, Tg, greater than or equal to 20° C. and that the SBR has a Tg greater than or equal to ?65° C.

Abstract: A tire comprising at least a rubber composition based on at least a blend of natural rubber, NR, or synthetic polyisoprene, and a styrene-butadiene copolymer, SBR, the SBR having a content greater than or equal to 20 parts per hundred parts of elastomer, phr, a reinforcing filler comprising carbon black, characterized in that the composition comprises a plasticizing resin having a glass transition temperature, Tg, greater than or equal to 20° C. and that the SBR has a Tg greater than or equal to ?65° C.

Abstract: The invention relates to a tyre sidewall, having a rubber composition based on at least one diene elastomer, a reinforcing filler comprising carbon black and a vulcanization system, characterized in that the carbon black has a CTAB specific surface area greater than or equal to 90 m2/g and that the proportion of this carbon black is between 30 and 40 phr.

Abstract: A tire tread incorporating an elastomeric composition reinforced with silica, based on at least (phr=parts by weight per hundred parts of diene elastomer): (i) a diene elastomer; (ii) as reinforcing filler, more than 80 phr of an inorganic filler constituted in its entirety or in part by a silica (referred to as LS) having the following characteristics: (a) a BET specific surface area of between 50 and 100 m2/g; (b) an average particle size, dW, of between 50 and 350 nm; (iii) a coupling agent providing the bond between the reinforcing inorganic filler and the diene elastomer; (iv) a vulcanization system based on sulfur. Preferably, this LS silica furthermore has a disagglomeration rate ? greater than 5×10?3 ?m?1/min (measured in the ultrasound disagglomeration test).

Abstract: A tire tread incorporating an elastomeric composition reinforced by an inorganic filler, based on at least: (i) a diene elastomer; (ii) as reinforcing inorganic filler, more than 80 phr of a silica of low specific surface area having the following characteristics: (a) a BET specific surface area of less than 130 m2/g; (b) an average particle size, dw, of between 30 and 300 nm; (iii) a coupling agent providing the bond between the reinforcing inorganic filler and the diene elastomer; (iv) a vulcanization system comprising sulfur, a vulcanization accelerator and between 0.5 and 1.5 phr of zinc as vulcanization activator. Preferably, this silica furthermore has a disagglomeration rate ? greater than 5×103 ?m?1/min (measured in the ultrasound disagglomeration test).

Abstract: Diene rubber compositions are described containing a diene elastomer, a reinforcing inorganic filler, and a coupling agent wherein the inorganic filler includes a silica having the following characteristics: (a) a BET specific surface area between 45 and 400 m2/g; (b) a CTAB specific surface area between 40 and 380 m2/g; (c) an average particle size (by mass), dw, of 20 to 300 nm; and at least one of the following characteristics, preferably two and more preferably all three: (d) a particle size distribution such that dw?/CTAB)?30; (e) a porosity which meets the criterion L/FI??0.0025 CTAB+0.85; (f) an amount of silanols per unit of surface area, NSiOH/nm2; NSiOH/nm2??0.027 CTAB+10.5. These diene rubber compositions can be used for the manufacture of tires or of semi-finished products intended for tires.

Abstract: A tire or tire tread incorporating an elastomeric composition having improved vulcanization kinetics, based on at least a diene elastomer, a reinforcing inorganic filler and, as (inorganic filler/elastomer) coupling agent, a bis-alkoxysilane tetrasulfide of the formula: in which: the symbols R1, which may be identical or different, each represent a monovalent hydrocarbon group selected from among the group consisting of alkyls, whether straight-chain or branched, having from 1 to 4 carbon atoms, and alkoxyalkyls, whether straight-chain or branched, having from 2 to 8 carbon atoms; R2 and R3, which may be identical or different, each represent a monovalent hydrocarbon group selected from among the group consisting of alkyls, whether straight-chain or branched, having from 1 to 6 carbon atoms, and the phenyl radical; and x is between about 3 and about 5.

Abstract: A tire tread incorporating an elastomeric composition reinforced with silica, based on at least (phr=parts by weight per hundred parts of diene elastomer): (i) a diene elastomer; (ii) as reinforcing filler, more than 80 phr of an inorganic filler constituted in its entirety or in part by a silica (referred to as LS) having the following characteristics: (a) a BET specific surface area of between 50 and 100 m2/g; (b) an average particle size, dW, of between 50 and 350 nm; (iii) a coupling agent providing the bond between the reinforcing inorganic filler and the diene elastomer; (iv) a vulcanization system based on sulfur. Preferably, this LS silica furthermore has a disagglomeration rate ? greater than 5×10?3 ?m?1/min (measured in the ultrasound disagglomeration test).

Abstract: A tire tread incorporating an elastomeric composition reinforced by an inorganic filler, based on at least: (i) a diene elastomer; (ii) as reinforcing inorganic filler, more than 80 phr of a silica of low specific surface area having the following characteristics: (a) a BET specific surface area of less than 130 m2/g; (b) an average particle size, dw, of between 30 and 300 nm; (iii) a coupling agent providing the bond between the reinforcing inorganic filler and the diene elastomer; (iv) a vulcanization system comprising sulfur, a vulcanization accelerator and between 0.5 and 1.5 phr of zinc as vulcanization activator. Preferably, this silica furthermore has a disagglomeration rate ax greater than 5×103 ?m?/min (measured in the ultrasound disagglomeration test).

Abstract: Diene rubber compositions are described containing a diene elastomer, a reinforcing inorganic filler, and a coupling agent wherein the inorganic filler includes a silica having the following characteristics: (a) a BET specific surface area between 45 and 400 m2/g; (b) a CTAB specific surface area between 40 and 380 m2/g; (c) an average particle size (by mass), dw, of 20 to 300 nm; and at least one of the following characteristics, preferably two and more preferably all three: (d) a particle size distribution such that dw?/CTAB)?30; (e) a porosity which meets the criterion L/FI??0.0025 CTAB+0.85; (f) an amount of silanols per unit of surface area, NSiOH/nm2; NSiOH/nm2??0.027 CTAB+10.5. These diene rubber compositions can be used for the manufacture of tires or of semi-finished products intended for tires.

Abstract: A tire or tire tread incorporating an elastomeric composition having improved vulcanization kinetics, based on at least a diene elastomer, a reinforcing inorganic filler and, as (inorganic filler/elastomer) coupling agent, a bis-alkoxysilane tetrasulfide of the formula: 1

Abstract: Rubber composition intended for the manufacture of tire casings which have improved hysteretic properties and scorch safety, based on at least one elastomer and silica by way of reinforcing filler enclosing a reinforcing additive consisting of the mixture and/or the product of in situ reaction of at least one functionalized polyorganosiloxane compound containing, per molecule, at least one functional siloxy unit capable of bonding chemically and/or physically to the surface hydroxyl sites of the silica particles and at least one functionalized organosilane compound containing, per molecule, at least one functional group capable of bonding chemically and/or physically to the polyorganosiloxane and/or the hydroxyl sites of the silica particles and at least one other functional group capable of bonding chemically and/or physically to the polymer chains.

Abstract: Rubber composition intended for the manufacture of tire casings which have improved hysteretic properties and scorch safety, based on at least one elastomer and silica by way of reinforcing filler enclosing a reinforcing additive consisting of the mixture and/or the product of in situ reaction of at least one functionalized polyorganosiloxane compound containing, per molecule, at least one functional siloxy unit capable of bonding chemically and/or physically to the surface hydroxyl sites of the silica particles and at least one functionalized organosilane compound containing, per molecule, at least one functional group capable of bonding chemically and/or physically to the polyorganosiloxane and/or the hydroxyl sites of the silica particles and at least one other functional group capable of bonding chemically and/or physically to the polymer chains.

Abstract: Use of an effective amount of a specific combination of silicone compounds comprising the combination: of at least one functionalized polyorganosiloxane (abbreviated as POS) containing, per molecule, at least one functional siloxy unit (abbreviated as UN1) capable of binding chemically and/or physically with the hydroxylated surface sites of the silica particles, and of at least one functionalized organosilane (abbreviated as OS) containing, per molecule, at least one functional group (abbreviated as G1) capable of binding chemically and/or physically with the UN1 units and/or the hydroxylated sites of the silica particles and at least one other functional group (abbreviated as G2) capable of binding chemically and/or physically to the elastomer chains, as silica/elastomer coupling agent in the natural or synthetic elastomer compositions comprising a siliceous material as reinforcing filler intended for the manufacture of an article made of elastomer(s).

Abstract: Rubber composition intended for the manufacture of tire casings which have mproved hysteretic properties and scorch safety, based on at least one elastomer and silica by way of reinforcing filler enclosing a reinforcing additive consisting of the mixture and/or the product of in situ reaction of at least one functionalized polyorganosiloxane compound containing, per molecule, at least one functional siloxy unit capable of bonding chemically and/or physically to the surface hydroxyl sites of the silica particles and at least one functionalized organosilane compound containing, per molecule, at least one functional group capable of bonding chemically and/or physically to the polyorganosiloxane and/or the hydroxyl sites of the silica particles and at least one other functional group capable of bonding chemically and/or physically to the polymer chains.

Abstract: A process for hardening a composition and a hardenable composition, in wh there are used:at least one novolac resin;at least one hardener of the resin, selected from the group consisting of substituted melamines;at least one compound comprising at least one ##STR1## group, this compound being without methylol group and ether group corresponding to methylol, and/or at least one reagent capable of giving such a compound under the conditions of the hardening.The hardening of the resin is caused by the action of heat.

Abstract: A process for hardening a composition and a hardenable composition, in wh there are used:at least one novolac resin;at least one hardener of the resin, selected from the group consisting of substituted melamines;at least one compound comprising at least one ##STR1## group, this compound being without methylol group and ether group corresponding to methylol, and/or at least one reagent capable of giving such a compound under the conditions of the hardening.The hardening of the resin is caused by the action of heat.

Abstract: A tire comprising at least a rubber composition based on at least a blend of natural rubber, NR, or synthetic polyisoprene, and a styrene-butadiene copolymer, SBR, the SBR having a content greater than or equal to 20 parts per hundred parts of elastomer, phr, a reinforcing filler comprising carbon black, characterized in that the composition comprises a plasticizing resin having a glass transition temperature, Tg, greater than or equal to 20° C. and that the SBR has a Tg greater than or equal to ?65° C.