Compagnie Generale Des Etablissements Michelin

Michelin Recherche Et Technique S.a.

Compagnie Generale Des Etablissements

Karine Longchambon

José Carlos Araujo Da Silva

Christelle Darnaud

Nicolas Seeboth

Stéphanie Cambon

Laure Belin

Philippe Labrunie

Laurent Copey

Regis Schach

Miguel Fernandez

Alexandre Tobie

Sébastien Sterin

Anne Veyland

Sergey Ivanov

Christine Nourry

Régis Schach

A tire comprises an outer strip () having a tread (). The outer strip () has a central part and two axially outer parts and comprises at least two rubber compounds (M, M) making up at least 90% of the volume of the outer strip (). The first compound (M) is radially outside of the second compound (M), which makes up at least 60% of the axially outer parts and being disposed in a layer that is substantially continuous from one axially outer part to the other, said layer having a minimum thickness at least equal to 0.3 mm. The compound Mhas a modulus G* that is greater than 1.35 times and less than 3 times that of the compound M. The compound Mhas a dynamic loss at 0° C. greater than 0.5 and the compound Mhas a dynamic loss at 23° C. less than 0.3.

Tire having an improved tread

A tire comprises an outer strip () having a tread (). The outer strip () has a central part and two axially outer parts and comprises at least two rubber compounds (M, M) making up at least 90% of the volume of the outer strip (). The first compound (M) is radially on the outside of the second compound (M), which makes up at least 60% of the axially outer parts and being disposed in a layer that is substantially continuous from one axially outer part to the other, said layer having a minimum thickness at least equal to 0.3 mm. The compound Mhas a modulus G* that is greater than 1.35 times and less than 3 times that of the compound M. The compound Mhas a dynamic loss at 0° C. greater than 0.5 and the compound Mhas a dynamic loss at 23° C. less than 0.3.

A rubber composition is based on at least: a diene elastomer; a reinforcing inorganic filler; an agent for coupling the reinforcing inorganic filler with the diene elastomer, said coupling agent being a blocked mercaptosilane of formula (I), as described in the claims; a hydrocarbon-based resin predominantly composed of monomers chosen from the group consisting of cyclopentadiene, dicyclopentadiene, methylcyclopentadiene and mixtures thereof, and a crosslinking system. A semi-finished article and a tire may comprise at least one such rubber composition.

Rubber compositions comprising a specific combination of a coupling agent and a hydrocarbon-based resin

A rubber composition is based on at least: a diene elastomer; a reinforcing inorganic filler; an agent for coupling the reinforcing inorganic filler with the diene elastomer, said coupling agent being an organofunctional silane comprising at least one oligomer of general formula (I), as described in the claims, bearing at least one blocked mercaptosilane unit and at least one mercaptosilane unit, a hydrocarbon-based resin predominantly composed of monomers chosen from the group consisting of cyclopentadiene, dicyclopentadiene, methylcyclopentadiene and mixtures thereof, and a crosslinking system. A semi-finished article and a tire may comprise at least one such rubber composition.

Rubber compositions comprising a specific combination of a coupling agent and a hydrocarbon resin

A tire comprises a rubber composition based on at least one diene elastomer, a reinforcing filler predominantly comprising silica, a crosslinking system, and a primary amine of formula (I): R&#x2014;NH(I), in which R represents a linear or branched hydrocarbon group comprising from 8 to 24 carbon atoms. The rubber composition is essentially devoid of guanidine derivative.

Tire comprising a composition essentially free of guanidine derivative and comprising a primary amine

The invention relates to a tire rubber composition based on at least one diene elastomer, an inorganic filler as reinforcing filler, a coupling agent providing the bonding between the inorganic filler and the diene elastomer, characterized in that the coupling agent is an azosilane compound of following formula (I):(G)(G)Si&#x2014;Z&#x2014;NH&#x2014;C(O)&#x2014;N&#x2550;N&#x2014;C(O)&#x2014;NH&#x2014;Z&#x2014;Si(G)(G)&#x2003;&#x2003;(I)in which:

Rubber tire composition comprising an azo-silane coupling agent

A tire comprises a rubber composition based on at least one diene elastomer, a reinforcing filler predominantly comprising silica, a crosslinking system, and a hydroxyalkylpiperazine of formula (I): in which Rrepresents a linear or branched alkyl group comprising from 1 to 18 carbon atoms, Rrepresents a linear or branched alkylene group comprising from 1 to 18 carbon atoms, it being understood that Rand Rcan bear one or more additional hydroxyl groups. The rubber composition is essentially devoid of guanidine derivative.

Tire comprising a composition essentially free of guanidine derivative and comprising a hydroxyalkylpiperazine

A tire comprising a rubber composition based on at least one diene elastomer, a reinforcing filler predominantly comprising silica, a crosslinking system, and an alkali metal hydroxide or alkaline earth metal hydroxide. The rubber composition is essentially devoid of guanidine derivative.

Tire comprising a composition essentially free of guanidine derivative and comprising an alkali metal hydroxide or alkaline-earth metal hydroxide

A tire comprises a rubber composition based on at least one diene elastomer, a reinforcing filler predominantly comprising silica, a crosslinking system, and an amino ether alcohol of formula (I): R&#x2014;O(&#x2014;R&#x2014;O)&#x2014;R&#x2014;NH(I), in which Rrepresents a linear or branched alkyl group comprising from 1 to 18 carbon atoms, Rand Rindependently represent a linear or branched alkylene group comprising from 1 to 18 carbon atoms, and n represents an integer from 0 to 20, it being understood that the amino ether alcohol bears one or more hydroxyl groups on at least one carbon-based chain chosen from R, Rand R. The rubber composition is essentially devoid of guanidine derivative.

Tire comprising a composition essentially devoid of guanidine derivative and comprising an amino ether alcohol

The invention relates to a rubber composition that is free of zinc or that contains less than 0.5 phr of zinc, which can be used for the manufacture of tires, based on at least:

Rubber composition comprising a blocked mercaptosilane coupling agent

An organosilane of general formula I below: (HO)RSi&#x2014;Z&#x2014;S&#x2014;Rin which: R, which are identical or different, each represent a monovalent hydrocarbon-based group chosen from alkyls, which are linear or branched, cycloalkyls or aryls, having from 1 to 18 carbon atoms; Rrepresents a monovalent hydrocarbon-based group chosen from alkyls, which are linear or branched, cycloalkyls or aryls, having from 1 to 30 carbon atoms; Z represents a divalent bonding group comprising from 1 to 18 carbon atoms; and m is a number greater than or equal to 2.

Organosilane coupling agent

A rubber composition that can be used for the manufacture of tires, based on at least one diene elastomer; one sulphur-based crosslinking system; one inorganic filler as reinforcing filler; one coupling agent of general formula I below: (HO)RSi&#x2014;Z&#x2014;S&#x2014;Rwherein in which: R, which are identical or different, each represent a monovalent hydrocarbon-based group chosen from alkyls, which are linear or branched, cycloalkyls or aryls, having from 1 to 18 carbon atoms; Rrepresents a monovalent hydrocarbon-based group chosen from alkyls, which are linear or branched, cycloalkyls or aryls, having from 1 to 30 carbon atoms; Z represents a divalent bonding group comprising from 1 to 18 carbon atoms; n is an integer equal to 0, 1 or 2; and m is a number greater than or equal to 2.

Rubber composition including an organosilane coupling agent

The invention relates to a blocked mercaptosilane of general formula I below:(HO)R&#x2014;Si&#x2014;Z&#x2014;S&#x2014;C(&#x2550;O)-Ain which:

Blocked mercaptosilane coupling agent

The invention relates to a rubber composition that is free of zinc or that contains less than 0.5 phr of zinc, which can be used for the manufacture of tyres, based on at least:

Rubber compound containing a blocked mercaptosilane coupling agent

A subject-matter of the present invention is a rubber composition intended for the manufacture of tires or of tire semi-finished products, based on at least one isoprene elastomer, an inorganic filler as reinforcing filler and a polyfunctional organosiloxane coupling agent capable of providing the bonding between the reinforcing inorganic filler and the isoprene elastomer, comprising per molecule, grafted to its silicon atoms, on the one hand at least one hydroxyl or hydrolysable functional group allowing it to be grafted to the reinforcing inorganic filler and, on the other hand, at least one group bearing at least one azodicarbonyl functional group &#x2014;CO&#x2014;N&#x2550;N&#x2014;CO&#x2014; allowing it to be grafted to the isoprene elastomer.

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Clermont-Ferrand, France

Karine Longchambon