Rubber composition comprising a silica of low specific surface and a diene elastomer of low glass transition temperature

摘要

The invention relates to a tyre, the tread of which comprises a rubber composition based on at least 90 to 100 phr of one or more diene elastomers referred to as very low glass transition temperature (Tg) diene elastomers having a Tg within a range extending from -110°C to -80°C, selected from butadiene homopolymers, copolymers of butadiene and of vinylaromatic monomer, having a content of vinylaromatic units of between 0 and 5% by weight, and mixtures of the latter; a reinforcing filler, said reinforcing filler comprising predominantly by weight a silica referred to as a low specific surface area silica, having a CTAB specific surface area of between 50 and 100 m²/g; a coupling agent that provides the bonding between the silica and the diene elastomer; a plasticizing system, said plasticizing system comprising at least more than 15 phr (parts by weight per hundred parts of elastomer) of a hydrocarbon resin referred to as a high Tg hydrocarbon resin having a Tg above 20°C; and a crosslinking system.