OBJET PNEUMATIQUE POURVU D'UNE COUCHE ELASTOMERE ETANCHE AUX GAZ DE GONFLAGE A BASE D'UN ELASTOMERE THERMOPLASTIQUE SOUS FORME D'UN COPOLYMERE A BLOCS (A-B-B) N-B-C

The invention relates to a tyre object provided with an elastomer layer sealed against inflation gases, said elastomer layer comprising as majority elastomer a thermoplastic elastomer in the form of a block copolymer which includes: a) an elastomer block comprising at least units from isobutylene, and having a glass transition temperature no higher than -20 °C; and b) one or more thermoplastic blocks, the one or more thermoplastic blocks each including at least one first block made up of units from at least one polymerisable monomer and at least one second block made up of units from β-pinene, the content of said units from β-pinene varying from 0.5 to 3 mol % relative to the number of moles of units of the block copolymer, said block copolymer having a mean molecular weight of 120 to 220 kg/mol. The invention also relates to a method for sealing a tyre object against inflation gases.