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Side part reinforcing layer and run-flat tire

A runflat and reinforcing layer technology, which is applied in the direction of special tires, tire parts, reinforcing layers of pneumatic tires, etc., can solve the problems of insufficient load support and low hardness, so as to improve control stability and prevent air leakage Excellent durability and lightweight effect

Inactive Publication Date: 2010-10-27
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the rubber composition must have bending resistance, so even if it is used as a rubber for side reinforcement, it is not enough to support the load due to its low hardness.

Method used

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  • Side part reinforcing layer and run-flat tire
  • Side part reinforcing layer and run-flat tire
  • Side part reinforcing layer and run-flat tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～2 and comparative example 1～2

[0109]

[0110] According to the formulation in Table 1, a masterbatch containing polyparaphenylene terephthalamide (PPTA) and stearic acid was prepared.

[0111] [Table 1]

[0112]

quality%

Aramid fiber (Note 1)

50

A silane coupling agent (Note 2)

6

Vulcanization accelerator (Note 3)

0.3

Sulfur (Note 4)

0.1

Stearic acid (Note 5)

42

[0113] (Note 1) Polyparaphenylene terephthalamide (PPTA): "Twaron" manufactured by Teijin.

[0114] (Note 2) Silane coupling agent: "Si69" manufactured by Dyssa Corporation.

[0115] (Note 3) Vulcanization accelerator: "NS" manufactured by Ouchi Shinko Chemical Industry Co., Ltd.

[0116] (Note 4) Sulfur: "Shiyu-ClonOT" manufactured by Shikoku Chemical Industry Co., Ltd.

[0117] (Note 5) Stearic acid: "Tsubaki" manufactured by NOF Corporation.

[0118]

[0119] According to the compounding content shown in Table 2, using a Banbury mixer, the insoluble sulfur and components other than the vulcanization accelerator were kneade...

Embodiment 3～7、 comparative example 3～7

[0147] Using the side reinforcement layers of the combination 1 and the combination 3 used in Example 1, Comparative Example 1, in the same manner as in Example 1, a run-flat tire with the material and structure of the carcass ply changed was manufactured.

[0148] Here, the basic structure of a run flat tire is figure 1 As shown, except for the material and structure of the carcass shown in Table 3, the same method is adopted. The basic way is as follows.

[0149] Carcass: 1 ply, the cord angle is 90° with respect to the circumferential direction.

[0150] Belt layer: Two belt plies of steel cords are laminated in opposite directions at a cord angle of 24° with respect to the tire circumferential direction.

[0151] Side reinforcement layer: the maximum thickness of rubber is 10.0mm.

[0152] In Table 3, the twist coefficient T is represented by the following formula (1).

[0153]

[0154] In addition, the specific gravity ρ of the rayon fiber cord was 1.51, and the specific gravity ρ ...

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Abstract

Provided is a run-flat tire having improved durability when punctured and showing increased running distance and speed. A side part reinforcing layer for a run-flat tire comprising a rubber composition obtained by compounding 0.1 to 50 parts by mass of a reinforcing material of poly(p-phenylene terephthalamide) with 100 parts by mass of a rubber component containing 20 to 80% by mass of natural rubber and / or polyisoprene rubber and 80 to 20% by mass of polybutadiene rubber, and the run-flat tire using the same.

Description

Technical field [0001] The present invention relates to a side reinforcement layer with excellent run-flat performance and a run-flat tire using the side reinforcement layer. Background technique [0002] The conventional run-flat tire has a structure in which high-hardness side reinforcement rubber is arranged inside the sidewall portion, and can travel to a specific distance such as a service station even when the internal pressure is reduced due to a puncture. By installing run-flat tires, there is no need to stock spare tires, and the overall weight of the vehicle can be reduced. However, the speed and running distance of run-flat tires at the time of a puncture are not yet sufficient, and it is expected to improve the durability of run-flat tires. [0003] As an effective means for improving the durability of the run-flat tire, a method of suppressing deformation by thickening the reinforcing rubber and preventing damage due to deformation can be cited. However, due to the i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C17/00B60C1/00B60C9/00B60C9/04B60C11/00C08L7/00C08L9/00
CPCB60C2001/0033C08L77/10B60C17/0009B60C2017/0063B60C9/28B60C15/0045B60C13/003C08L9/00C08L23/22C08L7/00C08L2666/02C08L2666/04
Inventor 井本洋二
Owner SUMITOMO RUBBER IND LTD
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