US 2014/0338811 A1Published application

Tire comprising casing-reinforcing cables having low permeability, and fabric threads combined with the casing reinforcement

AssigneesCompagnie Generale Des Etablissements Michelin, Michelin Recherche Technique S.A.

InventorsCharlotte Caffeau, Sébastien Noel, Nathalie Salgues, Patricia Lagarde

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Abstract

A tire having a radial carcass reinforcement, composed of at least one layer of metal reinforcing elements, the said tire comprising a crown reinforcement, itself topped radially by a tread, the said tread being joined to two beads via two sidewalls. The metal reinforcing elements of at least one layer of the carcass reinforcement are cords exhibiting, in the “permeability” test, a flow rate of less than 20 cm3/min and at least one layer of the carcass reinforcement is provided, on at least one face, with textile threads and at least the layer of elastomeric mixture, radially external to the bead wire and in contact with the latter, is an elastomeric mixture based on natural rubber or on synthetic polyisoprene and on a reinforcing filler conferring high cohesion.

Claims24

Dependent claims

A tire comprising:

a radial carcass reinforcement, comprising at least one layer of reinforcing elements inserted between two calendaring layers of elastomeric mixture,
wherein the metal reinforcing elements of at least one layer of the carcass reinforcement are cords exhibiting, in the “permeability” test, a flow rate of less than 20 cm3/min,
wherein at least one layer of the carcass reinforcement is provided, on at least one face, with textile threads, and
wherein at least the layer of elastomeric mixture, radially external to the bead wire and in contact with the latter, is an elastomeric mixture based on natural rubber or on synthetic polyisoprene having a majority of cis-1,4-enchainments and optionally on at least one other diene elastomer, the natural rubber or the synthetic polyisoprene, in the case of a blend, being present at a predominant content with respect to the content of the other diene elastomer or elastomers used, and on a reinforcing filler composed:
(i) either of a white filler of silica and/or alumina type comprising SiOH and/or AlOH surface functional groups, selected from the group consisting of precipitated or fumed silicas, aluminas and aluminosilicates, or alternatively carbon blacks modified during or after the synthesis so as to at least partially cover their surface with SiOH and/or AlOH functional groups, having a specific surface of between 30 and 260 m2/g, employed at a content of greater than or equal to 15 phr and less than or equal to 55 phr,
(ii) or of a blend of carbon black having a BET specific surface between 30 and 160 m2/g and a white filler described in (i), in which the overall content of filler is greater than or equal to 15 phr and less than or equal to 60 phr and the content in phr of white filler is greater than or equal to the content of carbon black in phr minus 5;
a crown reinforcement;
a tread radially topping the crown reinforcement and joined to two beads via two sidewalls.

5 more elements

A tire comprising:

a radial carcass reinforcement, composed of at least one layer of reinforcing elements,
wherein the metal reinforcing elements of at least one layer of the carcass reinforcement are cords comprising at least two layers, at least one inner layer being sheathed with a layer consisting of a polymeric composition, such as a non-crosslinkable, crosslinkable or crosslinked rubber composition, preferably based on at least one diene elastomer,
wherein at least one layer of the carcass reinforcement is provided, on at least one face, with textile threads, and
wherein at least the layer of elastomeric mixture, radially external to the bead wire and in contact with the latter, is an elastomeric mixture based on natural rubber or on synthetic polyisoprene having a majority of cis-1,4-enchainments and optionally on at least one other diene elastomer, the natural rubber or the synthetic polyisoprene, in the case of a blend, being present at a predominant content with respect to the content of the other diene elastomer or elastomers used, and on a reinforcing filler composed:
(i) either of a white filler of silica and/or alumina type comprising SiOH and/or AlOH surface functional groups, selected from the group consisting of precipitated or fumed silicas, aluminas and aluminosilicates, or alternatively carbon blacks modified during or after the synthesis so as to at least partially cover their surface with SiOH and/or AlOH functional groups, having a specific surface of between 30 and 260 m2/g, employed at a content of greater than or equal to 15 phr and less than or equal to 55 phr,
(ii) or of a blend of carbon black having a BET specific surface between 30 and 160 m2/g and a white filler described in (i), in which the overall content of filler is greater than or equal to 15 phr and less than or equal to 60 phr and the content in phr of white filler is greater than or equal to the content of carbon black in phr minus 5;
a crown reinforcement;
a tread radially topping the crown reinforcement and joined to two beads via two sidewalls.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/367,144Filed 18 Dec 2012
Priority: FR 116190319 Dec 2011
Published: 20 Nov 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification19 codes

B60C 9/005
Reinforcements or ply arrangement of pneumatic tyres: reinforcements made of different materials, e.g. hybrid or composite cords
B60C 1/0041
Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition: compositions of the carcass layers
B60C 9/0238
Carcasses: characterised by special physical properties of the carcass ply
B60C 9/09
The cords extend transversely from bead to bead, i.e. radial ply: combined with other carcass plies having cords extending diagonally from bead to…