| CPC B60C 19/08 (2013.01) [B60C 1/0016 (2013.01); B60C 1/0025 (2013.01); B60C 1/0041 (2013.01); B60C 9/185 (2013.01); B60C 11/0058 (2013.01); B60C 19/082 (2013.01); B60C 19/084 (2013.01); B60C 2001/0066 (2013.01); B60C 2001/0075 (2013.01); B60C 2011/0025 (2013.01); B60C 2015/0621 (2013.01); B60C 2200/065 (2013.01)] | 15 Claims |
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1. A tire for a heavy-duty vehicle of construction plant type comprising:
elastomer compounds derived from non-fossil, fossil, or both non-fossil and fossil resources, any elastomer compound having a viscoelastic loss tan(δ) defined as a ratio of a viscous shear modulus G″ to an elastic shear modulus G′, the modulus values being measured at a frequency of 10 Hz at a temperature of 100° C., and any electrically conductive elastomer compound being defined as having an electrical resistivity less than or equal to 1E+06 ohm-centimeter (‘Ω·cm), measured in accordance with standard ASTM-D257;
a tread having two axial end portions that are axially separated by a tread central portion;
a crown reinforcement, radially on an inside of the tread, comprising at least one protective reinforcement and a working reinforcement, the reinforcements being formed respectively of protective layers and of working layers containing metal reinforcers coated with an elastomer compound, the layers at their axial ends having a layer of edging compound;
a carcass reinforcement, radially on an inside of the crown reinforcement, comprising at least one carcass layer made up of metal reinforcers coated in an electrically conductive coating elastomer compound, the metal reinforcers being substantially mutually parallel and forming, with a circumferential direction, an angle of between 85° and 95°, each carcass layer comprising a main part, connecting two beads to one another and wrapped, within each bead, around a bead wire to form a turn-up;
a carcass-crown coupling layer consisting of an electrically conductive elastomer compound and inserted between the carcass reinforcement and the crown reinforcement, axially toward an outside in a shoulder region; and
two sidewalls connecting the two axial end portions of the tread to the two beads, the beads comprising a bead chafer layer intended to come into contact with a rim,
wherein a mass of the elastomer compounds derived from non-fossil resources is greater than or equal to 65% of a total mass of the elastomer compounds contained in the tire,
wherein at least 75% of the total mass of the elastomer compounds contained in the tire is made up of elastomer compounds each of which has a viscoelastic loss tan(δ) less than or equal to 0.065 and an electrical resistivity greater than or equal to 1E+10 ‘Ω·cm,
wherein a linking layer, made up of an electrically conductive elastomer compound is inserted radially between the carcass-crown coupling layer and the crown reinforcement, and is in contact at its axially exterior end with one of the two axial end portions of the tread and at its axially interior end with the carcass layer coating compound, and
wherein the one of the two axial end portions of the tread, the linking layer, the carcass layer electrically conductive coating elastomer compound, and the bead chafer layer constitute a conductive pathway for conducting electrical charge between a ground and the rim when the tire is mounted on the rim and compressed onto the ground.
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