POLY(ETHYLENETEREPHTHALATE) TIRE CORD, AND TIRE COMPRISING THE SAME

摘要

The present invention relates to a PET tire cord that can improve riding comfort of a car due to its good dimensional stability, and a pneumatic tire including the same. The PET tire cord has a flat spot index (FSI) defined by the following Calculation Formula 1 of 5.0% or less: [Calculation Formula 1] Flat Spot Index (FSI) (%) = (L1 - L2)/L0 X 100 wherein, L0 is an initial length of the tire cord, L1 is a length of the tire cord that is measured after providing a load corresponding to 13% of the strength at break of the cord for 5 minutes at 120°Cand cooling the same to 24°Cwhile maintaining the load, and L2 is a length of the tire cord that is measured after providing a load corresponding to 13% of the strength at break of the cord for 5 minutes at 120°Cand cooling the same to 24°while remaining the load of 0.01g/d only.