Pneumatic tire

Abstract

A pneumatic tire constituting part or all of the part members constituting the pneumatic tire by a rubber composition containing, based on a total 100 parts by weight of a rubber containing at least 70 parts by weight of an ethylenic unsaturated nitrile-conjugated diene-based highly saturated rubber having a content of conjugated diene units of not more than 30 percent by weight, 0 to 120 parts by weight of zinc methacrylate and 0 to 60 parts by weight of carbon black and having a total formulations of zinc methacrylate and carbon black of 10 to 120 parts by weight, and providing, between the above part members and the adjoining diene-based rubber layer, a bonding rubber layer comprising of a rubber composition containing, based on a total 100 parts by weight of a predetermined diene-based rubber and acrylonitrile butadiene copolymer rubber, 5 to 80 parts by weight of a predetermined aromatic petroleum resin.

1 . A pneumatic tire forming an air barrier layer by a rubber composition containing, based on a total 100 parts by weight of a rubber containing at least 70 parts by weight of an ethylenic unsaturated nitrile-conjugated diene-based highly saturated rubber having a content of conjugate not more than 30 percent by weight, 0 to 90 parts by weight of zinc methacrylate and 0 to 40 parts by weight of carbon black and having a total of formulations of zinc methacrylate and carbon black of 10 to 90 parts by weight, and providing between the air barrier layer and the adjoining rubber a bonding rubber layer comprised of a rubber composition containing, based on a total 100 parts by weight of (A) at least one type of diene-based rubber selected from the group consisting of a natural rubber, polyisoprene rubber, polybutadiene rubber, and conjugated dienearomatic vinyl copolymer rubber and (B) an acrylonitrile-butadiene copolymer rubber, (C) 5 to 80 parts by weight of an aromatic petroleum resin having an average molecular weight of 300 to 1500, a softening point of 50 to 160° C., and an iodine adsorption value of at least 20 g/100 g.  
     
     
         2 . A pneumatic tire as set forth in  claim 1 , wherein the thickness of the air barrier layer is 0.2 to 1.2 mm.  
     
     
         3 . A pneumatic tire as set forth in  claim 1 , wherein the thickness of the bonding rubber layer is 0.1 to 1.1 mm.  
     
     
         4 . A pneumatic tire as set forth in  claim 1 , wherein the ratio of weight of (A) and (B) of the rubber composition forming the bonding rubber layer is (A)/(B)=90/10 to 10/90.  
     
     
         5 . A pneumatic tire as set forth in  claim 1 , wherein the rubber composition forming the bonding rubber layer further contains at least one co-cross-linking agent selected from the group consisting of a methacrylic acid higher ester, triallyl isocyanurate, metal salt of methacrylic acid or acrylic acid, diallyl phthalate ester, and 1,2-polybutadiene, and is cross-linked by an organic peroxide.