Compagnie Generale Des Etablissements Michelin

Michelin Recherche Et Technique S.a.

Nathalie Salgues

Hichem Rehab

Jean-Luc Cabioch

Jean-François Parmentier

Aurore Lardjane

Jacques Besson

Sébastien Noel

Vincent Martin

Arnaud Gommez

Patricia Lagarde

Lionel Belin

Auriane Frisch

Charlotte Caffeau

Mukul Gupta

Jean-luc Cabioch

Claudia Navarro-Losada

Kazumi Makiuchi

Agnès Degeorges

A tire with a radial carcass reinforcement, made up of at least one layer of metal reinforcing elements inserted between two skim layers of elastomer compound containing a reinforcing filler made up of at least carbon black. The tensile elastic modulus at 10% elongation of at least the skim layer closest to the internal cavity of at least the carcass reinforcement layer closest to the internal cavity is less than 8.5 MPa and at least the said skim layer closest to the internal cavity of at least the carcass reinforcement layer closest to the internal cavity has a macrodispersion value Z greater than 85.

Tire comprising a carcass reinforcement layer having improved endurance properties

A cord rubberized in situ (C) comprising: an internal layer of the cord (CT), an external layer of the cord (CT), a rubber composition () positioned between the internal layer of the cord and the external layer of the cord. The rubber composition () comprises a compound of formula (I): in which X and Y represent, independently of each other, an alkali metal or alkaline earth metal cation.

Cable rubberized in situ comprising a rubberizing composition comprising a corrosion inhibitor

Tire comprising a crown reinforcement formed of at least two working crown layers each formed of reinforcing elements inserted between two skim layers of rubber compound. First layer S of polymer compound is in contact with a working crown layer and the carcass reinforcement. The crown reinforcement comprises a layer of circumferential reinforcing elements. The elastic modulus under tension at 10% elongation of a skim layer of a working crown layer is less than 8.5 MPa, the maximum value of tan(&#x3b4;) of the skim layer of a working crown layer is &#x3c;0.100. First layer S comprises a filled elastomer blend having a macro dispersion coefficient Z&#x2265;65 and a maximum tan(&#x3b4;) value &#x3c;0.100 and its complex dynamic shear modulus G*, measured at 10% and 60&#xb0; C. on the return cycle is &#x3e;1.35 MPa.

Tire comprising a layer of circumferential reinforcing elements

Tire comprising a crown reinforcement formed of at least two working crown layers of reinforcing elements. First layer C of rubber compound is placed between ends of the two working crown layers. Second layer S of polymer compound is in contact with at least one working crown layer and with the carcass reinforcement. The crown reinforcement includes at least one layer of circumferential reinforcing elements. The elastic modulus under tension at 10% elongation of first layer C is less than 8 MPa, the maximum value of tan(&#x3b4;) of first layer C is less than 0.100. The second layer S is made up of a filled elastomer blend having a macro dispersion coefficient Z greater than or equal to 65 and a maximum tan(&#x3b4;) value less than 0.100, and its complex dynamic shear modulus G*, measured at 10% and 60&#xb0; C. on the return cycle, is greater than 1.35 MPa.

Tire comprising a crown reinforcement formed of at least two working crown layers of reinforcing elements, crossed from one layer to the other making with the circumferential direction angles comprised between 10&#xb0; and 45&#xb0;. A first layer S of polymer compound is in contact with at least one working crown layer and in contact with the carcass reinforcement, the first layer S of polymer compound extending axially as far as at least the axial end of the tread, the first layer S of compound polymer compound is made up of a filled elastomer blend having a macro dispersion coefficient Z greater than or equal to 65 and a maximum tan(&#x3b4;) value, denoted tan(&#x3b4;)max, less than 0.100 and its complex dynamic shear modulus G*, measured at 10% and 60&#xb0; C. on the return cycle is greater than 1.35 MPa.

Tire having improved dynamic properties

Tire comprising a crown reinforcement comprising two working crown layers having unequal axial widths. Layer C of rubber compound is placed between ends of the working crown layers. Second layer S of polymer compound is in contact with at least one working crown layer and the carcass reinforcement, which comprises a layer of circumferential reinforcing elements arranged radially between two working crown layers. Distance d between the end of the axially narrowest working layer and the working layer separated from it by layer C is 1.1&#xf8;&#x3c;d&#x3c;2.2&#xf8;, &#xf8; being the diameter of the reinforcing elements, in a meridian plane. Second layer S is made up of a filled elastomer blend having a macro dispersion coefficient Z&#x2265;65 and a maximum tan(&#x3b4;) value less than 0.100. Its complex dynamic shear modulus G*, measured at 10% and 60&#xb0; C. on the return cycle is greater than 1.35 MPa.

Tire comprising a layer of circumferential reinforcement elements

A cord rubberized in situ (C). Internal layer of the cord (CT1) comprises N1 internal thread(s). External layer of the cord (CT3) comprises N3 external threads wound helically around the internal layer of the cord. Rubber composition (20) is positioned between the internal layer of the cord and the external layer of the cord, and comprises a compound of formula (I) or a salt of this compound: in which: each R1, R2 and R3 group represents, independently of one another, an alkylene, arylene, arylalkylene, alkylarylene or cycloalkylene group, each Xand Xgroup represents, independently of each other, &#x2014;COOH, &#x2014;CO&#x2014;NH&#x2014;OH, &#x2014;SOOH, &#x2014;PO(OR)(R') or &#x2014;PO(OR)(OR&#x2032;) with R and R&#x2032; representing, independently of each other, hydrogen or an alkyl group, and Xcomprises at least one &#x2014;COOH, &#x2014;CO&#x2014;NH&#x2014;OH, &#x2014;SOOH, &#x2014;PO(OR)(R&#x2032;) or &#x2014;PO(OR)(OR&#x2032;) group with R and R&#x2032; representing, independently of each other, hydrogen or an alkyl group.

Cable gummed in situ and containing a gumming composition that contains a corrosion inhibitor

A metal cord is rubberized in situ by a rubber composition that includes a styrene-butadiene copolymer. The styrene-butadiene copolymer includes styrene units at a proportion of between 25% and 35% by weight, limits included, of a total weight of the styrene-butadiene copolymer. The styrene-butadiene copolymer also includes trans-1,4-bonds at a proportion of between 73% and 83% by weight, limits included, of a total weight of a butadiene part of the styrene-butadiene copolymer.

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Clermont-Ferrand, France

Nathalie Salgues