Rubber composition and pneumatic tire using the rubber composition
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United States of America Patent
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Jul 3, 2001
Grant Date -
N/A
app pub date -
Mar 3, 1999
filing date -
Mar 4, 1998
priority date (Note) -
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Abstract
A rubber composition comprises, as a softener, a polymer obtained by cationic polymerization using a Lewis acid catalyst as an initiator. The polymer may be substantially a homopolymer of isobutylene, or substantially a copolymer of isobutylene and an aromatic vinyl compound. The homopolymer of isobutylene may be copolymerized with a conjugated diene monomer. The aromatic vinyl compound in the polymer may be styrene. In accordance with the present invention, a rubber composition exhibiting an excellent high hysteresis loss property without adverse effects on fracture properties can be provided. A pneumatic tire exhibiting excellent gripping ability can be provided by using the rubber composition in a tread.
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