Drawn poly(ethyleneterephthalate) fiber, poly(ethyleneterephthalate) tire-cord, their preparation method and tire comprising the same

Patent metadata

Field	Value
Publication number	US-9347154-B2
Application number	US-66365308-A
Country	US
Kind code	B2
Filing date	Jun 20, 2008
Priority date	Jun 20, 2007
Publication date	May 24, 2016
Grant date	May 24, 2016

Abstract

The present invention relates to a drawn PET fiber which has good dimensional stability, thereby increases the high speed driving performance of a tire, a PET tire cord, their preparation methods, and a tire including the same. The drawn PET fiber may includes 90 mol % or more of PET and may be a fiber of which a creep rate is 5.5% or less when the drawn PET fiber is fixed under the initial load of 0.01 g/d and is kept for 24 hours under the load of 0.791 g/d and the temperature of 100° C. Furthermore, the PET tire cord may be a cord of which a creep rate is 4.0% or less when the PET tire cord is fixed under the initial load of 0.01 g/d and is kept for 24 hours under the load of 0.791 g/d and the temperature of 100° C.

First claim

What is claimed is:

1. A drawn polyethylene terephthalate (PET) fiber, including 90 mol % or more of PET, wherein a creep rate defined by the following Calculation Formula 1 is 5.5% or less when the drawn PET fiber is fixed under the initial load of 0.01 g/d and is kept for 24 hours under the load of 0.791 g/d and the temperature of 100° C.:
Creep rate =( L−L 0)/ L 0 ×100  Calculation Formula 1

wherein L is a length of the drawn PET fiber after keeping it for 24 hours, L0 is a length of the drawn PET fiber when it is fixed under the initial load,
wherein the drawn PET fiber is obtained by drawing an undrawn PET fiber at a draw ratio of 1.0 to 1.70, 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 , wherein the creep rate after heating the drawn PET fiber for 15 min under the load of 0.01 g/d and the temperature of 180° C. is 7.5% or less when the heated drawn PET fiber is fixed under the initial load of 0.01 g/d and is kept for 24 hours under the load of 0.791 g/d and the temperature of 100° C.

3. The drawn PET fiber according to claim 1 , wherein the creep rate after heating the drawn PET fiber for 15 min under the load of 0.01 g/d and the temperature of 180° C. is 5.0% or less when the heated drawn PET fiber is fixed under the initial load of 0.01 g/d and is kept for 24 hours under the load of 0.791 g/d and the temperature of 20° C.

4. A polyethylene terephthalate tire cord including the drawn polyethylene terephthalate fiber according to claim 1 .

5. A polyethylene terephthalate (PET) tire cord, wherein a creep rate defined by the following Calculation Formula 1 is 4.0% or less when the PET tire cord is fixed under the initial load of 0.01 g/d and is kept for 24 hours under the load of 0.791 g/d and the temperature of 100° C.:
Creep rate =( L−L 0)/ L 0 ×100  Calculation Formula 1

wherein L is a length of the PET tire cord after keeping it for 24 hours, L0 is a length of the PET tire cord when it is fixed under the initial load,
wherein the PET tire cord is made from a drawn PET fiber that includes 90 mol % or more of PET, wherein a creep rate of the drawn PET fiber defined by the above Calculation Formula 1 is 5.5% or less when the drawn PET fiber is fixed under the initial load of 0.01 g/d and is kept for 24 hours under the load of 0.791 g/d and the temperature of 100° C.,
wherein the drawn PET fiber is obtained by drawing an undrawn PET at a draw ratio of 1.0 to 1.70, and
wherein the undrawn PET has an amorphous orientation factor (AOF) of 0.15 or less.

6. The PET tire cord according to claim 5 , wherein the creep rate after heating the PET tire cord for 15 min under the load of 0.01 g/d and the temperature of 180° C. is 7.0% or less when the heated PET tire cord is fixed under the initial load of 0.01 g/d and is kept for 24 hours under the load of 0.791 g/d and the temperature of 100° C.

7. The PET tire cord according to claim 5 , wherein the creep rate after heating the PET tire cord for 15 min under the load of 0.01 g/d and the temperature of 180° C. is 4.0% or less when the heated PET tire cord is fixed under the initial load of 0.01 g/d and is kept for 24 hours under the load of 0.791 g/d and the temperature of 20° C.

8. The PET tire cord according to claim 4 , having strength of 5 to 8 g/d, intermediate elongation (@4.5 kg) of 2.0 to 5.0%, elongation at break of 10 to 25%, and shrinkage rate (177° C., 30 g, 2 min) of 2.0 to 5.0%.

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

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

11. A pneumatic tire including the tire cord according to Claim 4 .

12. The pneumatic tire according to claim 11 , wherein the tire cord is applied to a cap ply cord.

13. A polyethylene terephthalate tire cord including the drawn polyethylene terephthalate fiber according to claim 2 .

14. A polyethylene terephthalate tire cord including the drawn polyethlene terephthalate fiber according to claim 3 .

15. The PET tire cord according to claim 5 , having strength of 5 to 8 g/d, intermediate elongation (@4.5 kg) of 2.0 to 5.0%, elongation at break of 10 to 25%, and shrinkage rate (177 oC, 30 g, 2 min) of 2.0 to 5.0%.

16. The PET tire cord according to claim 5 , having total linear density of 1000 to 5000 denier, number of ply of 1 to 3, and twisting level of 200 to 500 TPM.

17. The PET tire cord according to claim 5 , wherein the tire cord is a cap ply cord.

18. A pneumatic tire including the tire cord according to claim 5 .

Assignees

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

Inventors

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

Classifications

• B60C9/0042

  Reinforcements made of synthetic materials · CPC title

• Y10T428/2913

  Rod, strand, filament or fiber · CPC title

• D02G3/48 Primary

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

• D01F6/62 Primary

  from polyesters · CPC title

• D10B2331/04

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