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Rubber composition and run flat tire using the same

A rubber composition and run-flat technology, which is applied in special tires, tire parts, transportation and packaging, etc., can solve the problems of low hardness and insufficient load support, and achieve low heat generation and excellent run-flat performance

Inactive Publication Date: 2009-01-28
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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  • Rubber composition and run flat tire using the same
  • Rubber composition and run flat tire using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～2 and comparative example 1～4

[0050]

[0051] (1) SPBd crystalline SBR-2

[0052] 250 g of 1,3-butadiene was dissolved in 8000 ml of a hexane solution, and 1000 g of SBR ("SL574" manufactured by JSR) was added to fully dissolve it. As a polymerization catalyst, 500 ml of 0.2M triisopropylaluminum, 20 ml of 0.042 M cobalt octoate solution, and 15 ml of carbon disulfide were added, reacted at 40°C for 8 hours, and dried under reduced pressure to obtain SPBd with an SPBd crystal content rate of 12% by mass. Crystalline SBR-2 was 1135 g.

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Abstract

The present invention relates to a run flat tire having improved durability during a blowout, an increased running distance and velocity, and using for a side portion reinforcing layer a rubber composition including a rubber component containing 20 to 80% by mass of styrene-butadiene rubber including 5 to 60% by mass of syndiotactic 1,2-polybutadiene crystal, and 10 to 80% by mass of natural rubber and / or polyisoprene rubber, and carbon black blended in an amount of 10 to 80 parts by mass with 100 parts by mass of the rubber component. The rubber composition preferably contains a C5-based petroleum resin having a number-average molecular weight of 300 to 10000, which is obtained by polymerizing C5-based petroleum hydrocarbon, in an amount of 0.5 to 10 parts by mass with respect to 100 parts by mass of the rubber component.

Description

technical field [0001] The present invention relates to a rubber composition for side portion reinforcement excellent in run-flat performance and a run-flat tire using the same. Background technique [0002] The structure of conventional run-flat tires is equipped with high-hardness side-reinforcing rubber installed on the inside of the sidewall. Even in a state where the internal pressure decreases due to a puncture, it is possible to travel a certain distance and reach the service center. stand. By installing such run-flat tires, it is not necessary to always have a spare tire, so that the overall weight of the vehicle can be expected to be reduced. However, run-flat tires at the time of blowout have a limited speed and distance of run-flat travel, and improvement in durability of run-flat tires is desired. [0003] As a method of effectively improving the durability of a run-flat tire, there is a method of suppressing deformation and preventing damage caused by deformat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L9/06C08L7/00C08L9/00C08K3/04B60C1/00
CPCC08L7/00C08L9/00B60C2001/0033B60C1/0025C08L9/06C08L101/00C08L2666/08B60C1/00B60C2001/005C08K3/04
Inventor 保地和郎
Owner SUMITOMO RUBBER IND LTD
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