REINFORCEMENT LAYER FOR A PNEUMATIC VEHICLE TIRE, PREFERABLY FOR A BELT BANDAGE LAYER OF A PNEUMATIC VEHICLE TIRE

Abstract

The invention relates to a reinforcement ply for a pneumatic vehicle tire, preferably for a belt bandage ply of a pneumatic vehicle tire, where the reinforcement ply has strengthening elements comprising at least one multifilament yarn, and where the at least one multifilament yarn is composed of polyamide based mainly on renewable raw materials. For the conservation of the environment and resources, coupled with improved product quality, the multifilament yarn consists of nylon-4,10.

Claims

1-8. (canceled)

9. A pneumatic vehicle tire reinforcement ply, comprising strengthening elements that comprise at least one multifilament yarn, wherein the multifilament yarn comprises nylon-4,10 sourced from plant material.

10. The reinforcement ply of claim 9, wherein the reinforcement ply is a belt bandage ply.

11. The reinforcement ply of claim 10, wherein the belt bandage ply comprises 14001 or 9402 nylon-4,10.

12. The reinforcement ply of claim 11, wherein the 14001 nylon-4,10 is end twisted at 100 t/m, and wherein the 9402 nylon-4,10 is end twisted at 350 t/m.

13. The reinforcement ply of claim 10, wherein the pneumatic vehicle tire further comprises: a crown region, two sidewalls, a bead region comprising one or more bead cores, an impervious inner layer, a radial carcass comprising the strengthening elements extending from the crown region through the sidewall and into the bead region, wherein the strengthening elements are anchored by entangling of the bead cores, and a radially outward rubber tread comprising profile grooves, wherein the belt bandage is arranged between the rubber tread and the radial carcass.

14. The reinforcement ply of claim 9, wherein one monomer of the nylon-4,10 is sourced exclusively from plant materials.

15. The reinforcement ply of claim 9, wherein the nylon-4,10 comprises no synthetic fibers.

16. The reinforcement ply of claim 14, wherein the one monomer is produced by a process of: obtaining castor oil from seeds of a castor oil plant, obtaining sebacic acid from the castor oil, reacting the sebacic acid and a diamine in a polycondensation reaction.

17. The reinforcement ply of claim 9, wherein the strengthening element is an end-twisted cord comprising at least two twisted multifilament yarns.

18. The reinforcement ply of claim 17, wherein the multifilament yarn has a fineness of 100 to 5000 dtex and a twist rate of 100 to 600 t/m.

19. The reinforcement ply of claim 17, wherein the cord consists of 2 or 3 end-twisted multifilament yarns.

20. The reinforcement ply of claim 9, wherein all of the multifilament yarns consist of nylon-4,10.

21. A pneumatic vehicle tire, comprising the reinforcement ply of claim 9.

22. The pneumatic vehicle tire of claim 21, wherein the reinforcement ply is a belt bandage ply or a bead reinforcement.

23. A method of manufacturing a pneumatic vehicle tire reinforcement ply, which comprises: growing a castor oil plant so that it produces seeds, harvesting the seeds from the castor oil plant, extracting castor oil from the seeds, producing sebacic acid from the castor oil, reacting the sebacic acid with a diamine in a polycondensation reaction to create nylon-4,10, creating a multifilament yarn from the nylon-4,10, twisting at least two multifilament yarns together to create a cord, and embedding one or more nylon-4,10 cords into a rubber mixture to create a reinforcement ply.

24. The method of claim 23, wherein the multifilament yarn has a fineness of 100 to 5000 dtex and a twist rate of 100 to 600 t/m.

25. The method of claim 23, wherein the cord comprises 2 or 3 end-twisted multifilament yarns.

26. The method of claim 23, wherein the reinforcement ply is a belt bandage ply comprising cords that comprise 14001 or 9402 twisted nylon-4,10 yarns.

Description

DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION

[0019] Polyamide-4,10 features a polymer structure having good stretchability and suitably high shrinkage at a suitable modulus. By comparison with the other polyamides, nylon-4,10 is thus a good compromise between shrinkage and modulus, which is particularly suitable for use as a strengthening element in a belt bandage ply.

[0020] Moreover, nylon-4,10 is notable for low water absorption capacity, which means that the good properties such as breaking strength are obtained in the presence of moisture as well.

[0021] It is additionally advantageous that nylon-4,10 has great similarity to nylon-6,6, which is frequently used in reinforcement plies. In this way, easy exchange of nylon-6,6 (PA 6,6) for nylon-4,10 (PA 4,10) is possible with retention, for example, of the bonding system used.

[0022] The table which follows shows the advantageous properties of PA 4,10 multifilament yarns over PA 6,6 multifilament yarns.

TABLE-US-00001 Dtex Shrink- Tenacity Elonga- Load@ 4% [g/ age [cN/ tion@Break Elongation 1000 m] [%] tex %] [%] [cN/tex] PA 6,6 1400 6 75 18 11.9 PA 4,10 1400 8 79 16 11.5

[0023] The values are measured on an untwisted yarn.

[0024] Shrinkage is determined according to ASTM D885 and ASTM D4974.

[0025] The force/elongation data are determined according to ASTM D855M.

[0026] In one embodiment of the invention, the strengthening element is an end-twisted cord made from at least two twisted multifilament yarns. The twisting of the multifilament yarn or the cord achieves an improvement in fatigue resistance of the strengthening element by comparison with untwisted strengthening elements.

[0027] It is appropriate when the multifilament yarn has a fineness of 100 to 5000 dtex and a twist rate of 100 to 600 t/m. Multifilament yarns of this kind can be produced in a simple manner and are suitable for use as strengthening elements in pneumatic vehicle tires.

[0028] It is advantageous when the cord consists of 2 or 3 end-twisted multifilament yarns.

[0029] In a particular version of the invention, all multifilament yarns of the cord consist of nylon-4,10.

[0030] In an alternative version of the invention, one multifilament yarn of the cord does not consist of nylon-4,10. But it is also possible that at least one multifilament yarn of the cord does not consist of nylon-4,10. In that case, the cord is what is called a hybrid cord. This is then based at least partly on renewable raw materials, is configured in a resource-conserving manner and offers, as a further advantage, the option of defined adjustment of the cord via a specific material selection of the yarn that does not consist of nylon-4,10.

[0031] The invention likewise relates to a pneumatic vehicle tire having a reinforcement ply as per a reinforcement ply detailed above. This reinforcement ply is a belt bandage ply or a bead reinforcement, such as a chipper or a flipper.

[0032] Pneumatic vehicle tires are mass-produced products where partial exchange of mineral oil-based materials for materials not based on mineral oil leads to a particularly major effect with regard to conservation of resources. Moreover, it has been shown that reinforcement plies comprising strengthening elements composed of multifilament yarns of nylon-4,10 lead to high durability in the tire.

[0033] A car tire may, for example, have a belt bandage ply made of cords of the following construction:

Variant A: Construction/material: 14001/nylon-4,10 [0034] End twisting: 100 t/m
Variant B: Construction/material: 9402/nylon-4,10 [0035] End twisting: 350 t/m

[0036] In the case of cords, that is, in the case of strengthening elements having two or more multifilament yarns, the yarn twisting is equal to the cord twisting, but in the opposite direction.

[0037] It is understood that the foregoing description is that of the preferred embodiments of the invention and that various changes and modifications may be made thereto without departing from the spirit and scope of the invention as defined in the appended claims.