COMPOUND FOR A TYRE CARCASS PORTION

A rubber compound for tire carcass portions comprising at least a polymer base with a cross-linkable unsaturated chain comprising at least 50% by weight of the polymer base of natural rubber, a filler comprising carbon black and a vulcanization system comprising sulphur. The vulcanization system comprises a mixture of at least one accelerator and at least one anti-reversion agent, said mixture consisting of 25 to 80% by weight of the mixture of at least one accelerator belonging to the class of sulfenamides and 75 to 20% by weight of the mixture of at least one anti-reversion agent.