PNEUMATIC OBJECT HAVING A GAS TIGHT LAYER CONTAINING A SPECIFIC SIBS THERMOPLASTIC ELASTOMER

摘要

The invention relates to a pneumatic object having an elastomer layer that is tight relative to inflating gases, wherein said elastomer layer comprises at least, as a major elastomer, a SIBS thermoplastic elastomer comprising a polyisobutylene block having a ratio of units from one or more conjugated dienes that ranges from 0.5 to 6 wt % relative to the weight of the polyisobutylene block and, at at least one of the ends of the polyisobutylene block, a styrene block representing at most 16 wt % of the total weight of the block copolymer. Preferably, the tight elastomer layer further comprises, as a plasticiser, a SIBS-elastomer extension oil. The pneumatic object of the invention particularly consists of an air tube or tyre for an automobile.