Abstract: Provided is an air permeation resistant film in which flexibility can be imparted to the film without remarkably increasing the proportion of a rubber constituting a dispersed phase. An air permeation resistant film comprising (A) a thermoplastic polyester elastomer which comprises a block copolymer containing a polyester as a hard segment and has a melting point of from 180 to 230° C., and (B) a rubber, in a mass ratio (A)/(B) of from 90/10 to 40/60, wherein the component (A) and the component (B) are melt-kneaded to perform dynamic crosslink, thereby forming a continuous phase composed of the component (A) and a dispersed phase composed of the component (B), and the film has an air permeation coefficient at 80° C. of 5×1013 fm2/Pa·s or less and Young's modulus of 120 MPa or less.

Abstract: To provide a tire inner liner formed by using a cylindrical film (10) including a thermoplastic material and obtained by inflation molding, in which a ratio of breaking strength in a tire width direction (14) to breaking strength in a tire circumferential direction (18) of the cylindrical film (10) is from 1.35 to 1.80. A pneumatic tire (1) is obtained by extruding and molding the cylindrical film (10) in which a ratio of breaking strength in an extrusion direction (12) to breaking strength in a direction perpendicular to the extrusion direction (16) is from 1.35 to 1.80 by inflation molding using a thermoplastic material, forming a green tire by placing the obtained cylindrical film (10) on a forming drum so that the extrusion direction (12) becomes the tire width direction (14), and vulcanizing and molding the green tire.

Abstract: Provided is an air permeation resistant film in which flexibility can be imparted to the film without remarkably increasing the proportion of a rubber constituting a dispersed phase. An air permeation resistant film comprising (A) a thermoplastic polyester elastomer which comprises a block copolymer containing a polyester as a hard segment and has a melting point of from 180 to 230° C., and (B) a rubber, in a mass ratio (A)/(B) of from 90/10 to 40/60, wherein the component (A) and the component (B) are melt-kneaded to perform dynamic crosslink, thereby forming a continuous phase composed of the component (A) and a dispersed phase composed of the component (B), and the film has an air permeation coefficient at 80° C. of 5×1013 fm2/Pa·s or less and Young's modulus of 120 MPa or less.