Tire cord
The present disclosure relates to a tire cord. The tire cord includes a polyester drawn yarn containing recycled polyethylene terephthalate. The tire cord may exhibit excellent physical properties industrially required while including eco-friendly materials.
1. A tire cord comprising a polyester drawn yarn containing 25 wt % or more of recycled polyethylene terephthalate having an intrinsic viscosity of 0.9 dl/g to 1.5 dl/g and an isophthalic acid content of less than 1.0 mol % based on the total carboxylic acid component,
wherein a tensile strength is 7.0 g/d to 8.0 g/d and an elongation at break is 15.0% to 17.5% when measured according to the standard test method of ASTM D 885.
2. The tire cord of claim 1 ,
wherein the recycled polyethylene terephthalate has an isophthalic acid content of 0 mol % to 0.95 mol % based on the total dicarboxylic acid component in the recycled polyethylene terephthalate.
3. The tire cord of claim 1 , wherein a tensile strength ratio of the tire cord to the polyester drawn yarn, which is {=[(tensile strength of tire cord)/(tensile strength of polyester drawn yarn)]×100}, is 88.5% or more.
4. The tire cord of claim 1 ,
wherein the tire cord has an elongation at specific load of 3.5% to 5.0% when measured under a load of 4.5 g/d according to the standard test method of ASTM D 885.
5. The tire cord of claim 1 ,
wherein the tire cord has a thermal shrinkage of 3.0% to 6.0% when measured according to the standard test method of ASTM D 885 (specimen length 250 mm, 177° C., 2 minutes, load of 0.01 g/d).
6. The tire cord of claim 1 ,
wherein the tire cord comprises a raw-cord having a total fineness of 1000 denier to 9000 denier.
7. The tire cord of claim 1 ,
wherein the polyester drawn yarn comprises 30 wt % to 100 wt % of the recycled polyethylene terephthalate.
8. The tire cord of claim 1 ,
wherein the polyester drawn yarn has a tensile strength of 8.0 g/d to 9.0 g/d and an elongation at break of 14.0% to 17.0%.
9. The tire cord of claim 1 ,
wherein the polyester drawn yarn has a thermal shrinkage of 9.5% to 15.0% when measured according to the standard test method of ASTM D 885 (specimen length 250 mm, 177° C., 2 minutes, load of 0.01 g/d).
10. The tire cord of claim 1 ,
wherein the polyester drawn yarn has a total draw ratio of 1.0 to 3.0 times.
11. The tire cord of claim 1 ,
wherein the tire cord is a 2-ply yarn comprising the polyester drawn yarn.
12. A tire comprising the tire cord of claim 1 .