| 摘要 |
PROBLEM TO BE SOLVED: To enhance durability at the time of high speed driving, stable maneuverability and also comfortable drive while promoting lighter weight and a lower cost. SOLUTION: Alphatic polyketene fiber is used as a carcass cord. The alphatic polyketene fiber cord must be equal to end more than 15.0 g/d in tensile strength equal to and, less than 3.0% in medium elongation and the sum of the same medium elongation and heat-dry shrinkage factor must be equal to and less than 5.5%.
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