RUBBER COMPOSITION FOR USE AS A BONDING RUBBER IN A TYRE

摘要

The present invention provides a bonding rubber composition useful for bonding a first rubber composition in the crosslinked state, comprising an ethylene-propylene-diene terpolymer, to a second rubber composition based on at least one diene elastomer having a molar percentage of units derived from conjugated dienes higher than 50%. Said invention also relates to a bonding rubber (9) useful for bonding a casing ply (7) of a tyre (1) in the crosslinked state, comprising the second composition, to an external layer (8) made of the first composition and axially outwardly defining a wall (4) of the tyre (1). Said crosslinkable or crosslinked bonding rubber composition is based on at least one hydrogenated block diene elastomer having a number-average molecular weight higher than 20,000 g/mol, whereby said elastomer comprises a polybutadiene block in which the percentage of hydrogenated butadiene units is no lower than 60%, and a polyisoprene block.