To provide a pneumatic radial tire capable of improving high-speed durability and uneven wear resistance.
At least one layer of carcass layer 4 divided in a tire width direction within a center region of a tread portion 1 is disposed between a pair of bead portions 3, 3. A plurality of layers of belt layers 7 are arranged on the outer periphery side of the carcass layer 4 in the tread portion 1. There is disposed at least one layer of a belt cover layer 8 in which reinforcing cord is arranged at an angle of not more than 5 degrees to the tire peripheral direction on the outer peripheral side of the belt layers 7. As the reinforcing cord of the belt cover layer 8, a polyolefin ketone fiber cord is used, the thermal shrinkage of which is not more than 2.0% at 150°C and which has a structure expressed in the following formula (1):-(CH2-CH2-CO)n-(R-CO)m-, wherein 1.05≥(n+m)/n≥1.00, and R is an alkylene group with the carbon atoms of not less than 3.
HATA HIROSHI
| JP2009214628A | 2009-09-24 | |||
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| JP2008013035A | 2008-01-24 | |||
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| JP2010023653A | 2010-02-04 |
Takashi Noguchi
Kenji Sato
Takayoshi in the daytime
Isao Hirai
Masao Sakaizawa
Kazuhiko Saishita
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