The object of the tire provided with a layer of elastomer that is leakproof to the inflation gas, a base of a thermoplastic elastomer in the form of a block copolymer

摘要

The invention relates to a pneumatic 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 in the form of a statistical copolymer comprising units from at least one polymerisable monomer and 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, and said block copolymer having a mean molecular weight of 120 to 220 kg/mol. The invention also relates to a method for sealing a pneumatic object against inflation gases.