Patent ID: 6334919
Filing Date: 2002-01-01
Classification: B60C,C08L,Y10T

Abstract:
A process of producing a pneumatic tire containing:an air permeation prevention layer of a polymer composition having an air permeation coefficient of 25Ã—10âˆ’12 ccÂ·cm/cm2Â·secÂ·cmHg (at 30Â° C.) or less and a Young's modulus of 1 to 500 MPa, comprising: (A) at least 10% by weight, based on the weight of the total polymer component, of at least one thermoplastic resin selected from the group consisting of polyamide resins, polyester resins, polynitrile resins, polymethacrylate resins, polyvinyl resins, cellulose resins, fluorine resins, and imide resins, said thermoplastic resin having an air permeation coefficient of 25Ã—10âˆ’12 ccÂ·cm/cm2Â·secÂ·cmHg (at 30Â° C.) or less and a Young's modulus of more than 500 MPa and (B) at least 10% by weight, based on the total weight of the polymer component, of at least one elastomer component having an air permeation coefficient of more than 25Ã—10âˆ’12 ccÂ·cm/cm2Â·secÂ·cmHg (at 30Â° C.) and a Young's modulus of not more than 500 MPa, comprising the steps of: (i) dynamically vulcanizing the elastomer component (B) of the polymer composition in the presence of a vulcanization agent during melting and kneading of the polymer composition, followed by forming a thin film of the polymer composition having a structure of the vulcanized elastomer component (B) dispersed as a discontinuous phase in a matrix of the thermoplastic resin (A); (ii) arranging the thin film of the polymer composition as the air permeation preventive layer in a green tire, and (iii) vulcanizing the green tire to form the pneumatic tire.