AIR PERMEATION-RESISTANT FILM AND PNEUMATIC TIRE

摘要

PROBLEM TO BE SOLVED: To provide an air permeation-resistant film which has flexibility without greatly increasing a ratio of rubber constituting a dispersed phase and exhibits a tire internal pressure holding effect based on its air permeation resistance when used as an inner liner.SOLUTION: The air permeation-resistant film comprises: (A) a thermoplastic elastomer having an air permeability coefficient (80°C) of 5×10fm/Pa s or lower, a Young's modulus of 100-400 MPa, and a melting point of 170°C or higher; and (B) the rubber having a Young's modulus of 50 MPa or lower. A weight ratio (A)/(B) between the both components is 90/10 to 40/60, and the component (A) is used as a continuous phase while the component (B) is used as a dispersed phase. In the air permeation-resistant film, an air permeability coefficient (80°C) is 5×10fm/Pa s or lower and a Young's modulus is 120 MPa or lower.