Rubber composition for base tread
AssigneeSumitomo Rubber Industries, Ltd.
InventorTetsuya Kunisawa
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Abstract
The purpose of the present invention is to provide a rubber composition for a base tread being excellent in fuel efficiency. In the rubber composition for a base tread, a dynamic elastic modulus E* (MPa) and a loss tangent tan δ which are measured at a temperature of 70° C., an initial strain of 10% and a dynamic strain of 2% satisfy the following general formulae (1) to (3), and a strength at break TB (MPa) and an elongation at break EB (%) which are measured according to JIS K6251 satisfy the following general formulae (4) and (5). E*/tan δ≥25 General formula (1) 2.0≤E*≤8.0 General formula (2) tan δ≤0.08 General formula (3) EB≥350 General formula (4) TB×EB≥8500 General formula (5)
Claims9
A pneumatic tire comprising a base tread made of a rubber composition for a base tread, wherein the rubber composition for the base tread has a dynamic elastic modulus E* (MPa) and a loss tangent tan δ which are measured at a temperature of 70° C., an initial strain of 10% and a dynamic strain of 2% and satisfies the following general formulae (1) to (3)
- E*/tan δ≥25 General formula (1)
- 2.0≤E*≤3.4 General formula (2)
- tan δ≤0.08, and General formula (3)
- a strength at break TB (MPa) and an elongation at break EB (%) which are measured according to JIS K6251 satisfy the following general formulae (4) and (5)
- EB≥350 General formula (4)
- TB×EB≥8500. General formula (5)
Dependencies are inferred from the claim text.