# US 10,369,844 B2 · Bielastic polyester tire cord as cap ply

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- Number: US 10,369,844 B2
- Document ID: US10369844B2
- Status: Granted
- Kind: B2
- Application number: 15/740,353
- Filed: 2016-07-01
- Published: 2019-01-31
- Granted: 2019-08-06
- Earliest claimed: 2016-07-01
- Assignees: Kordsa Teknik Tekstil Anonim Sirketi
- Applicants: Kordsa Teknik Tekstil Anonim Şirketi.
- Inventors: M. Sadettin Fidan; Kürsat Aksoy; Anil Ibis
- Web page: https://patentgrep.com/patent/US10369844B2

## CPC

- B60C 9/0042: {Reinforcements made of synthetic materials}
- B60C 1/0016: {Compositions of the tread}
- B60C 9/22: the plies being arranged with all cords disposed along the circumference of the tyre
- D02G 3/48: Tyre cords {(tyre reinforcements B60C9/00; metal cords for reinforcing rubber or plastic articles D07B1/0606)}
- B60C 2009/0092: {Twist structure}
- B60C 2009/2214: {characterised by the materials of the zero degree ply cords}
- B60C 2009/2257: {Diameters of the cords; Linear density thereof}
- B60C 2009/2285: {Twist structures}
- D10B 2331/04: polyesters, e.g. polyethylene terephthalate [PET]
- B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- D02G: CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D10B: INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES

## Abstract

The present invention relates to a novel polyester tire cord reinforcement which has bi-elastic tensile properties. The tire cord includes at least two cord plies, and there is a spacing between the cord plies. Such a novel bi-elastic polyester tire cord improves high speed durability and significantly eliminates flatspotting when used as a cap ply in pneumatic radial tires.

## Claims

### Claim 1

A dipped and heat-set polyester cord, comprising a plurality of cord plies having a spacing between the plurality of cord plies, wherein a TASE at 2.0% elongation of the dipped and heat-set polyester cord is less than 2.0 cN/dtex;
wherein the spacing between the plurality of cord plies is longer than 10% and shorter than 60% of a cord diameter of the cord plies.

### Claim 2 (depends on 1)

The dipped and heat-set polyester cord according to claim 1, wherein the spacing between the plurality of cord plies of the dipped and heat-set polyester cord is preferably longer than 20% and shorter than 50% of the cord diameter.

### Claim 3 (depends on 1)

The dipped and heat-set polyester cord according to claim 1, wherein an adhesive dip pick-up (DPU) of the cord is higher than 8% and less than 30% by weight.

### Claim 4 (depends on 1)

The dipped and heat-set polyester cord according to claim 1, wherein the adhesive dip pick-up (DPU) of the dipped and heat-set polyester cord is preferably higher than 10% and lower than 20% by weight.

### Claim 5 (depends on 1)

The dipped and heat-set polyester cord according to claim 1, wherein the dipped and heat-set polyester cord has a twist factor in between 10,000-22,000; wherein the twist factor is calculated according to the following formula (1):
twist factor =cord twist (tpm) ×square root of total nominal cord dtex (1).

### Claim 6 (depends on 1)

The dipped and heat-set polyester cord according to claim 1, wherein the dipped and heat-set polyester cord has a total nominal linear density in between 800 dtex-6,000 dtex.

### Claim 7 (depends on 1)

The dipped and heat-set polyester cord according to claim 1, wherein the dipped and heat-set polyester cord is a polyethylene terephthalate cord.

### Claim 8 (depends on 1)

The dipped and heat-set polyester cord according to claim 1, wherein the dipped and heat-set polyester cord is a polyethylene naphthalate cord.