The invention relates to a tyre tread comprising an elastomer composition reinforced with an inorganic filler and made from at least: (i) a diene elastomer; (ii) by way of a reinforcing inorganic filler, more than 80 pce of a silica having a low specific surface area and the following characteristics: (a) a BET specific surface area of less than 130 m2/g; (b) an average particle size d?w? of between 30 and 300 nm; (iii) a coupling agent that is used to connect the reinforcing inorganic filler and the diene elastomer; (iv) and a vulcanisation system comprising sulphur, a vulcanisation accelerator and, by way of a vulcanising activator, between 0.5 and 1.5 pce of zinc. Preferably, said silica has a deagglomeration speed α that is greater than 5.10?3 νm1?/min (measured with the deagglomeration test using ultrasound). In comparison to a standard tyre tread for green tyres reinforced with a silica having a higher specific surface area, the inventive tyre tread is provided with an improved performance trade-off (wear resistance/rolling resistance/wet surface adhesion). Owing to the low zinc level, an increase in induction times during vulcanisation can be mitigated when a silica having a low specific surface area is used.

Tyre tread reinforced with silica having a low specific surface area

The invention concerns a tyre and a rubber composition for tyre or semi-finished product for tyre, based on at least one isoprene elastomer (for example, natural rubber), an inorganic filler as reinforcing filler (for example, silica), a coupling system binding said reinforcing inorganic filler and the isoprene elastomer, said coupling system comprising in combination: a monofunctional covering agent (for example, a polyorganosiloxane oil) capable of binding to the functional sites of the inorganic filler surface; and as coupling agent, an organosilicium compound (for example, an organosilane or an organosiloxane) at least bifunctional graftable on the elastomer by means of a functional azo-dicarbonyl (-CO-N=N-CO-) group.

Rubber composition for tyre comprising an organosilicium coupling agent and an inorganic filler covering agent

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 μm−/min (measured in the ultrasound disagglomeration test). Compared with a conventional tread for “Green Tires” which is reinforced with a silica of higher specific surface area, the tread of the invention has an improved compromise of (wear resistance/rolling resistance/grip on wet ground) performances. The use of a very small amount of zinc makes it possible to overcome an increase in the induction delays during the vulcanization, when such a silica of low specific surface area is used.

Tire tread reinforced with a silica of low specific surface area

The invention concerns a tyre and a rubber composition for tyre based on at least one isoprene elastomer (for example, natural rubber), one inorganic filler as reinforcing filler (for example, silica), a coupling system binding said reinforcing inorganic filler and the isoprene elastomer, said coupling system comprising in combination: as first coupling agent, a sulphurated silane compound; as second coupling agent, one at least bifunctional organosilicium compound (for example an organosilane or an organosiloxane) capable of being grafted on the elastomer by means of an azo-dicarbonyl functional (-CO-N=N-CO-) group.

Rubber composition for tyre comprising an organosilicium coupling system

The invention concerns a tyre or a running tread incorporating an elastomeric composition with improved vulcanization kinetics, based on at least a diene elastomer, a reinforcing inorganic filler and, as coupling agent (inorganic filler/elastomer), a bis-alkoxysilane tetrasulphide of formula (I) wherein: the symbols R1, identical or different, represent each a monovalent hydrocarbon group selected among alkyls, linear or branched, having 1 to 4 carbon atoms; R2 and R3, identical or different, represent each a monovalent hydrocarbon group selected among alkyls, linear or branched, having 1 to 6 carbon atoms and the phenyl radical; x is an integer or a fraction number between 3 and 5.

Tyre and running tread comprising as coupling agent a bis-alkoxysilane tetrasulphide

A rubber compsn. vulcanisable by sulphur based on dienic polymer contains: (i) a reinforcement filling of a pptd. silica contg. an Al content of 0.35-3%, relative to silica. Also claimed is a rubber tube or belt, made from the new material.

Rubber composition suitable for treads containing aluminium doped precipitated silica

The object of the present invention is a rubber composition which is inted for the manufacture of tires and has a base of precipitated silicas "doped" with aluminum, the aluminum content being between ≧0.35% and ≦3% by weight of silica. Said composition has improved working properties as well as improved hysteresis properties.

Rubber composition for the manufacture of tires which has a base of precipitated silicas "doped" with aluminum

A rubber composition intended for the manufacture of tire casings and elastic bearings for vehicle suspension systems, with elastomeric base containing oxygenated functions reinforced with a majority of silica-type filler, whose hysteretic properties are improved by use of a combination of an aminoalkylalkoxysilane with an alkylalkoxysilane, particularly for use in the tread of tire casings for trucks, construction and farm vehicles or airplanes.

Composition intended for the manufacture of tire casing with an elastomeric base containing oxygenated functions and silica as filler

PROBLEM TO BE SOLVED: To obtain a rubber composition at least partially reinforced by silica improved in hysteresis characteristics, abrasion resistance and tensile properties. SOLUTION: This rubber composition comprises (a) at least one diene elastomer containing an oxygenated functional group, (b) a filler at least partially containing at least one so-called 'silica type' substance selected from the group consisting of silica and substances having an oxygenated silicon functional group on its surface other than silica, (c) at least one coupling agent selected from the group consisting of aminoalkylalkoxysilanes, aminoarylalkoxysilanes and aminoaralkylalkoxysilanes, whose alkyl, aryl or aralkyl groups may be optionally substituted with a functional group, and (d) at least one coating agent selected from the group consisting of alkylalkoxysilanes, arylalkoxysilanes and aralkylalkoxysilanes, whose alkyl, aryl or aralkyl groups may be optionally substituted with a functional group other than an amino or sulfo group.

Rubber composition for preparation of article consisting mainly of elastomer, bearing oxygenated functional group and containing silica as filler

FIELD: rubber industry SUBSTANCE: rubber composition contains: (i) at least one diene elastomer with oxygen-containing groups; (ii) filler at least partially consisting of at least one silica-type substance selected from silica and substance other than silica, the two having superficial oxygen-containing silicon functions; (iii) at least one binding agent selected from aminoalkyl- alcoxysilanes, aminoarylalcoxysilanes, and aminoaralkyl-alcoxysilanes; and (iv) at least one containing substance selected from alkyl-alcoxysilanes, aryl-alcoxysilanes, and aralkyl-alcoxysilanes Envisaged products are tires and pneumatic tire treads, and elastic connections connecting vehicle bottom EFFECT: improved hysteresis properties 19 cl, 11 tbl, 7 ex

Robert Vanel

Papers

Rubber composition suitable for treads containing aluminium doped precipitated silica

Rubber composition for the manufacture of tires which has a base of precipitated silicas "doped" with aluminum

Composition intended for the manufacture of tire casing with an elastomeric base containing oxygenated functions and silica as filler

Rubber composition for preparation of article consisting mainly of elastomer, bearing oxygenated functional group and containing silica as filler

Rubber compound and products thereof