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Pneumatic tire

A technology of pneumatic tires and carcass, which is applied to special tires, tire parts, tire edges, etc., to achieve the effect of excellent conductivity

Inactive Publication Date: 2017-04-19
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the tire still leaves room for improvement in terms of fuel economy, electrical conductivity, handling stability, crack growth resistance, etc.

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0124] The present invention is specifically described with reference to examples, but the present invention is not limited to these examples.

[0125] The chemicals used in the examples are as follows.

[0126]

[0127] NR:TSR20

[0128] BR51: JSR BR51 manufactured by JSR Corporation (high cis BR, BR synthesized using Nd catalyst, cis content: 95% by mass)

[0129] BR1250H: BR1250H manufactured by Zeon Corp. (low cis BR, BR synthesized using Li catalyst)

[0130] VCR617: UBEPOL VCR617 (BR containing syndiotactic polybutadiene crystal) manufactured by Ube Industries, Ltd.

[0131] BR150B: UBEPOL BR150B manufactured by Ube Industries, Ltd. (high cis BR, BR synthesized using Ni catalyst, cis content: 95% by mass, Mooney viscosity (100°C): 40, Mw / Mn: 2.78, vinyl Content: 2.0% by mass)

[0132] SBR1502: SBR1502 manufactured by Sumitomo Chemical Co., Ltd. (styrene content: 23.5% by mass)

[0133] Carbon black N220: Shoblack N220 (N 2 SA: 114m 2 / g, DBP: 114ml / 100g)

[013...

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Abstract

The present invention provides a pneumatic tire having superior electrical conductivity, fuel efficiency, steering stability and crack growth resistance. The present invention is a pneumatic tire having a specific structure and provided with: a sidewall section comprising two or more laminated layers of rubber that include an outer sidewall layer (1) forming an outer tire surface and an inner sidewall conductive layer (2) that is connected to a clinch and a breaker and is disposed between a carcass and the outer sidewall layer (1); a tread section; a bead section provided with the clinch; the carcass; the breaker; and a conductive rubber, wherein the thickness ratio of the outer sidewall layer (1) to the inner sidewall conductive layer (2) in the sidewall section, and the ratio of the storage elastic modulus E'(1) of the outer sidewall layer (1) at 70 DEG C to the storage elastic modulus E'(2) of the inner sidewall conductive layer (2) at 70 DEG C in the sidewall section, are respectively within specific ranges, and the volume resistivity of the inner sidewall conductive layer (2) is within a specific range.

Description

technical field [0001] The present invention relates to pneumatic tires. Background technique [0002] Generally, raw materials derived from petroleum resources such as butadiene rubber and carbon black are widely used in rubber compositions for tires; however, due to stricter regulations for reducing carbon dioxide emissions, and in consideration of limited oil reserves Due to the limited supply of these materials, studies have been conducted to partially or completely use raw materials derived from non-petroleum resources such as natural rubber and white fillers (eg, silica, calcium carbonate) instead of raw materials derived from petroleum resources. [0003] For example, when silica is mixed into tire components, the electrical resistance of the tire tends to increase due to the high electrical insulating properties of silica; therefore, static electricity tends to accumulate in the vehicle, and there is a risk of: During fueling, a spark due to static electricity may o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C13/00B60C15/06B60C19/08
CPCB60C19/086B60C1/0025B60C19/082B60C2013/006B60C2013/007B60C2013/045
Inventor 石野崇
Owner SUMITOMO RUBBER IND LTD
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