Pneumatic tire comprising a carcass ply, an inner layer of elastomer and a reinforcing elastomer layer between said fabric and said inner layer.

摘要

Tire comprising: - a carcass ply based on metal wires and an elastomeric carcass layer coating said wires; - an inner elastomeric layer which defines the radially inner face of said cover and which is intended to protect said carcass ply from the diffusion of air from the interior of said cover, and - a layer of elastomer reinforcement that is placed between said carcass layer and said inner layer and consists of a rubber composition, wherein said composition comprises: - an elastomeric matrix comprising at least: a natural or synthetic polyisoprene whose chains comprise mostly chains cis -1.4, and a copolymer of one or more monomers having conjugated dienes and one or more vinylaromatic monomers, said copolymer being such that its proportion of diene D -1.2 chains (in%) and the proportion of vinylaromatic chains VA (in%) hang time fulfill the following four inequalities: (i) D = 60-1, 75-VA (ii) D = 116-1, 64-VA (iii) D 10 (iv) VA 10, and - black from car bond, according to a number of parts by weight per hundred parts of said elastomer (abbreviated phr) of between 25 and 85 phr, said carbon black values ​​DBP structure (in ml / 100g) and BET specific surface (in m2 / g) satisfying the following inequality: DBP = -0.88 + 190-BET.