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AssigneeThe Yokohama Rubber Co., Ltd.
InventorsJiro Watanabe, Noriaki Kuroda, Gou Kawaguchi, Tetsuji Kawazura, Hidekazu Takeyama, Yoshihiro Soeda, Kazuo Suga, Yoshiaki Hashimura, Osamu Ozawa
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A pneumatic tire having an air permeation preventive layer comprising a low permeability thermoplastic elastomer composition comprising a thermoplastic elastomer having a thermoplastic resin composition as a continuous phase and a rubber composition as a dispersed phase, in which a barrier resin composition is contained, which low permeability thermoplastic elastomer composition has a phase structure in which the barrier resin composition is dispersed in the form of a flat state in the thermoplastic elastomer, is abundant in flexibility, is superior in gas permeation preventive property, and enables the tire to be reduced in weight.
A pneumatic tire having an air permeation preventive layer comprising a thermoplastic elastomer composition containing (A) at least one thermoplastic resin component having an air permeation coefficient of not more than 25.times.10.sup.-12 cc.multidot.cm/cm.sup.2 .multidot.sec.multidot.cmHg and a Young's modulus of more than 500 MPa and (B) at least one elastomer component having an air permeation coefficient of more than 25.times.10.sup.-12 cc.multidot.cm/cm.sup.2 .multidot.sec.multidot.cmHg and a Young's modulus of not more than 500 MPa, wherein the melt viscosity (.eta..sub.m) of the thermoplastic resin component (A), the melt viscosity (.eta..sub.d) of the elastomer component (B), and the difference in solubility parameters of the elastomer component and the thermoplastic resin component at the mixing temperature satisfy the relationship of the following formula (1):
Dependencies are inferred from the claim text.