| 摘要 |
A thermoplastic elastomer composition dynamically vulcanized to a gelation rate of 50 to 95% which is superior in heat resistance and durability while maintaining flexibility and superior in air permeation preventive property which can be efficiently used as, for example, a pneumatic tire as an air permeation preventive layer. In particular, a thermoplastic elastomer composition having a reduced particle size of the domain rubber is produced by a material having a high rubber ratio by mixing a composition (C) mixed under conditions of a ratio of melt viscosities of the rubber composition (A)/resin (B) of 0.8 to 1.2 and the formula (phi<SUB>A</SUB>/phi<SUB>B</SUB>)x(eta<SUB>B</SUB>/eta<SUB>A</SUB>)<1.0 under conditions of a ratio of melt viscosities of the rubber composition (D)/composition (C) of 0.8 to 1.2 and the formula (phi<SUB>D</SUB>/phi<SUB>C</SUB>)x(eta<SUB>C</SUB>/eta<SUB>D</SUB>)<1.0, wherein phi<SUB>A</SUB>: volume fraction of rubber composition (A), phi<SUB>B</SUB>: volume fraction of resin (B), eta<SUB>A</SUB>: melt viscosity of rubber composition (A), eta<SUB>B</SUB>: melt viscosity of resin (B), phi<SUB>C</SUB>: volume fraction of composition (C), phi<SUB>D</SUB>: volume fraction of rubber composition (D), eta<SUB>C</SUB>: melt viscosity of composition (C), eta<SUB>D</SUB>: melt viscosity of rubber composition (D). Further, a thermoplastic elastomer composition having an elastomer composition (A) as a dispersion phase and a thermoplastic resin composition (B) as a matrix and having a thermoplastic resin composition composed of a blend of at least two thermoplastic resins.
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