| abstract |
An article having a fluid permeation prevention layer, such as a pneumatic tire or hose. A tire for example includes an outer tread layer, intermediate sidewall and carcass layers and an innermost air permeation prevention layer: (i) the air permeation prevention (APP) layer having an upper and a lower surface, the layer having a polymer composition exhibiting an air permeation coefficient (APC) of about 25xlO'12 cc cm/cm2 sec cmHg (at 30* C) or less and a Young's modulus of about 1 MPa to about 500 MPa, the polymer composition comprising: (A) at least 10 wt% of at least one. thermoplastic resin component having an APC of about 25xlO'12 cc cm/cm2 sec cmHg (at 30° C) or less and a Young's modulus of more than 500 MPa, which is preferably a polyamide resin or mixture, and (B) at least 10 wt% of at least one elastomer component having an APC of more than about 25x10'12 cc cm/cm2 sec cmHg (at 30° C) and a Young's modulus of not more than 500 MPa, which elastomer component is preferably a halogen-containing rubber or mixture, the total amount (A)+(B) being not less than about 30 wt%, and the elastomer component is a dispersed vulcanized, discontinuous phase in the thermoplastic resin matrix; and (ii) at least one thermoplastic laminate layer bonded to at least said lower surface of the APP layer, the thermoplastic layer comprising a film-forming, serai-crystalline, substantially hydrophobic carbon chain polymer having a glass transition temperature, Tg, of less than about -200C. |