Elastomer composition, method for producing same, and pneumatic tire using same

A pneumatic tire having an inner liner comprising an elastomer composition (C) having no thermoplasticity which comprises a matrix of at least one thermoplastic resin (A) selected from the group consisting of Nylon 6, Nylon 6/66 copolymer, Nylon 11, Nylon 12, a Nylon 6/10 copolymer and a Nylon 6/12 copolymer in which a dispersed phase of at least one elastomer component (B) selected from the group consisting of a bromide of an isoprene-paramethyl styrene copolymer, a maleic anhydride-modified ethylene-a-olefin copolymer, butyl rubber and halogenated butyl rubber is finely dispersed to form an island-in-sea structure, wherein volume ratios of the thermoplastic resin (A) and the elastomer component (B) satisfy the following formula (I):

• fd/fm>hd/hm (I)
• where fd and hd, respectively, indicate a volume ratio and a melt viscosity of the elastomer component (B) and fm and hm, respectively, indicate a volume ratio and a melt viscosity of the thermoplastic resin (A).