Drawn polyethylene terephthalate fiber, pet tire cord, and tire comprising thereof

Patent metadata

Field	Value
Publication number	US-9441073-B2
Application number	US-201314078047-A
Country	US
Kind code	B2
Filing date	Nov 12, 2013
Priority date	Mar 31, 2008
Publication date	Sep 13, 2016
Grant date	Sep 13, 2016

Abstract

The present invention relates to a drawn PET fiber that can provide a cap ply cord and the like showing more improved modulus and good dimensional stability, a PET tire cord, and a tire including the same. The drawn PET fiber may be a fiber including 90 mol % or more of PET, of which the crystallinity is 53% or more, the amorphous orientation factor (AOF) is 0.15 or less, and the birefringence index is 0.14 to 0.16, after heat-treating the same at 230° C. for 1 minute under the initial load of 20 g/1000 d.

First claim

What is claimed is:

1. A drawn PET fiber, including 90 mol % or more of PET, and showing the elongation of 5.0 to 7.0% when giving the load of 2.0 kg/1000 d, and the elongation of 11.0 to 14.0% when giving the load of 4.5 kg/1000 d, after heat-treating the same at 180° C. for 2 minute under the initial load of 20 g/1000 d,
wherein the drawn PET fiber is obtained by drawing an undrawn PET fiber at a draw ratio of 0.1 to 1.55, and
wherein the undrawn PET fiber has an amorphous orientation factor (AOF) of 0.15 or less.

2. The drawn PET fiber according to claim 1 , showing the elongation of 2.0 to 2.6% when giving the load of 2.0 kg/1000 d, and the elongation of 5.0 to 7.0% when giving the load of 4.5 kg/1000 d, before the heat-treatment.

3. A PET tire cord, including the drawn fiber according to claim 1 .

4. The PET tire cord according to claim 3 , wherein the L/S value defined by the following Calculation Formula 1 is 70 g/d to 150 g/d:
L/S =LASE/Shrinkage rate (%)  [Calculation Formula 1]

In the calculation formula, LASE is defined as load at specific elongation when the elongation is 3% at 100° C.

5. The PET tire cord according to claim 4 , wherein the LASE defined as the load at 3% elongation is 1.7 to 3.0 g/d when testing the tensile property with the initial load of 0.05 g/d at the temperature of 100° C.

6. The PET tire cord according to claim 4 , wherein total linear density is 1000 to 5000 denier, the number of ply is 1 to 3, and the twisting level is 200 to 500 TPM.

7. The PET tire cord according to claim 4 , showing the strength of 5 to 8 g/d, the Elongation (@4.5 kgf) of 1.5 to 5.0%, and the elongation at break of 10 to 25%.

8. The PET tire cord according to claim 4 , wherein the tire cord is a cord for cap ply.

9. A pneumatic tire, including the tire cord according to claim 3 .

Assignees

• Kolon Inc

Inventors

• Chung Il
• Jeon Ok-Hwa
• Kim Gi-Woong

Classifications

• D01F6/62

  from polyesters · CPC title

• D10B2331/04

  polyesters, e.g. polyethylene terephthalate [PET] · CPC title

• D01D10/02

  Heat treatment (heating for finishing D02J13/00) · CPC title

• D02G3/48

  Tyre cords {(tyre reinforcements B60C9/00; metal cords for reinforcing rubber or plastic articles D07B1/0606)} · CPC title

• B60C9/0042 Primary

  Reinforcements made of synthetic materials · CPC title