| 摘要 |
PURPOSE: To obtain a polymer composition which can give a lightweight tire when used as the air permeation preventing layer of a pneumatic tire, excellent in a balance between air permeation resistance and flexibility and adhesion of the layer and rubber. CONSTITUTION: This polymer composition for a tire having an air permeability coefficient of 25×10<-12> cc.cm/cm<2> .sec.cmHg or below and a Young's modulus of 1-500MPa comprises at least 10wt.% thermoplastic resin (A) having an air permeability coefficient of 25×10<-12> cc.cm/cm<2> .sec.cmHg or below and a Young' s modulus of above 500MPa, at least 10wt.% elastomer (B) having an air permeability coefficient of above 25×10<-12> cc.cm/cm<2> .sec.cmHg and a Young's modulus of 500MPa or below, and 3-70wt.% another thermoplastic resin (C) based on components A, B and C, provided that the entire amount of components A and B being 30wt.% or above. The resin C has a difference between the critical surface tension of this component used as a tire and that of the mating rubber layer of 3mN/m or below.
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