| 摘要 |
A rubber composition used for an inner liner layer that reduces an amount of air permeation, lessens density of the rubber composition and does not lower fracture property of the rubber composition is provided. The rubber composition is used for an inner liner layer of an inner surface of a tire and comprises 1 to 30 parts by weight of thermal expansion microcapsules based on 100 parts by weight of rubber components containing a butyl rubber in an amount of not less than 80 % by weight, wherein an outer shell portion of independent thermal expansion microcapsules is made of a thermoplastic resin, and an average particle diameter of the thermal expansion microcapsules is 10 to 95 µm.
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