US 11,807,054 B2
Polyester tire cord and radial tire using same
Kyoung Ha Lee, Anyang (KR); Cheol Kim, Seongnam (KR); and Jin Kyung Park, Yongin (KR)
Appl. No. 16/758,879
Filed by HYOSUNG ADVANCED MATERIALS CORPORATION, Seoul (KR)
PCT Filed Oct. 2, 2018, PCT No. PCT/KR2018/011693
§ 371(c)(1), (2) Date Apr. 24, 2020,
PCT Pub. No. WO2019/088464, PCT Pub. Date May 9, 2019.
Claims priority of application No. 10-2017-0144469 (KR), filed on Nov. 1, 2017.
Prior Publication US 2020/0369086 A1, Nov. 26, 2020
Int. Cl. B60C 9/00 (2006.01); C08G 63/183 (2006.01); C08L 67/02 (2006.01); D02G 3/48 (2006.01); D07B 1/02 (2006.01)
CPC B60C 9/0042 (2013.01) [C08G 63/183 (2013.01); C08L 67/02 (2013.01); D02G 3/48 (2013.01); D07B 1/02 (2013.01); B60C 2009/0085 (2013.01); D07B 2205/2039 (2013.01); D07B 2501/2046 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A radial tire comprising:
a pair of parallel bead cores;
at least one radial carcass ply which is wound around the bead core;
at least one inclined belt layer laminated on an outer circumference of the at least one radial carcass ply; and
at least one cap ply layer laminated on an outer circumference of the inclined belt layer in a tire circumferential direction,
wherein the cap ply includes a dip cord manufactured using a yarn containing 90 mol % or more of polyethylene terephthalate,
wherein the dip cord has a shrinkage rate of 3.0 to 4.0%, a load of 2.5 to 3.0 g/d at 5% elongation, a breaking strength of 6.5 to 7.5 g/d, and a shape stability index of 5.8 to 6.5,
wherein the dip cord is generated by twisting 400 to 2200 d yarns containing 90 mol % or more of polyethylene terephthalate by 1 or more plys, and
wherein the dip cord's nominal denier is 1,300 to 2,600, and the dip cord's twist coefficient, which is a number of twists multiplied by a square root of nominal denier, is 9,000 to 18,000.