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US 10,766,305 B2Granted
Pneumatic tire
AssigneeSumitomo Rubber Industries, Ltd.
InventorTetsuya Kunisawa
Life of this patent
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Abstract
The present invention provides a pneumatic tire that achieves a balanced improvement in fuel economy, wet grip performance, handling stability, abrasion resistance, fatigue resistance, and tensile strength. The present invention relates to a pneumatic tire including a tread formed from a rubber composition, the rubber composition having after vulcanization rubber properties satisfying certain values.
Claims18
A pneumatic tire, comprising a tread formed from a rubber composition,
- the rubber composition including an aromatic petroleum resin,
- the rubber composition including a quinoline antioxidant and a p-phenylenediamine antioxidant, and
- the rubber composition having after vulcanization rubber properties satisfying all the following relations (1) to (7):
- (tan δ1/tan δ2)≥4.38 (1)
- (E*/tan δ2)≥21.88 (2)
- 3.5≤E*≤6.0 (3)
- tan δ2≤0.16 (4)
- tan δ1≥0.70 (5)
- EB≥600 (6)
- TB×EB≥12000 (7)
- where tan δ1 in relations (1) and (5) represents a tan δ at 0° C. determined by viscoelastic measurement at an initial strain of 10% and a dynamic strain of 5%;
- tan δ2 in relations (1), (2), and (4) represents a tan δ at 30° C. determined by viscoelastic measurement at an initial strain of 10% and a dynamic strain of 2%;
- E* in relations (2) and (3) represents a dynamic elastic modulus (E* (MPa)) at 30° C. determined by viscoelastic measurement at an initial strain of 10% and a dynamic strain of 2%;
- EB in relations (6) and (7) represents a tensile elongation (EB (%)) determined in accordance with JIS K 6251;
- and TB in relation (7) represents a tensile strength at break (TB (MPa)) determined in accordance with JIS K 6251.
12 more elements
A pneumatic tire, comprising a tread formed from a rubber composition,
- the rubber composition including a quinoline antioxidant and a p-phenylenediamine antioxidant, and
- the rubber composition having after vulcanization rubber properties satisfying all the following relations (1) to (7):
- (tan δ1/tan δ2)≥4.38 (1)
- (E*/tan δ2)≥21.88 (2)
- 3.5≤E*≤6.0 (3)
- tan δ2≤0.16 (4)
- tan δ1≥0.70 (5)
- EB≥600 (6)
- TB×EB≥12000 (7)
- where tan δ1 in relations (1) and (5) represents a tan δ at 0° C. determined by viscoelastic measurement at an initial strain of 10% and a dynamic strain of 5%;
- tan δ2 in relations (1), (2), and (4) represents a tan δ at 30° C. determined by viscoelastic measurement at an initial strain of 10% and a dynamic strain of 2%;
- E* in relations (2) and (3) represents a dynamic elastic modulus (E* (MPa)) at 30° C. determined by viscoelastic measurement at an initial strain of 10% and a dynamic strain of 2%;
- EB in relations (6) and (7) represents a tensile elongation (EB (%)) determined in accordance with JIS K 6251;
- and TB in relation (7) represents a tensile strength at break (TB (MPa)) determined in accordance with JIS K 6251.
11 more elements
Dependencies are inferred from the claim text.