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Rubber composition for tire sidewall and pneumatic tire using same

A rubber composition and tire technology, applied in special tires, tire parts, transportation and packaging, etc., to achieve the effects of suppressing the decrease in hardness, improving low fuel consumption, cutting resistance and bending fatigue resistance

Active Publication Date: 2016-10-12
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, according to the technology described in Patent Document 1, the requirements for suppression of hardness reduction, low fuel consumption, cut resistance, and bending fatigue resistance cannot be satisfied to a high degree.

Method used

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  • Rubber composition for tire sidewall and pneumatic tire using same
  • Rubber composition for tire sidewall and pneumatic tire using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～6 and comparative example 1～11

[0062] Sample preparation

[0063] In the compounding (parts by mass) shown in Table 1, the vulcanization accelerator and components other than sulfur were kneaded for 5 minutes using a 1.5-liter closed-type Banbury mixer, and then the clinker was released at a temperature of 150°C. And carry out room temperature cooling. Then, the clinker was added with a vulcanization accelerator and sulfur using a roll rubber mixer, and kneaded for 2 minutes to obtain a rubber composition for tire sidewalls. Then, the obtained rubber composition was vulcanized under pressure at 160° C. for 20 minutes in a prescribed mold to prepare a vulcanized rubber test piece. The physical properties of the obtained rubber composition or vulcanized rubber test piece were measured by the following test methods.

[0064] Hardness: The Shore A hardness at 20°C was measured in accordance with JIS K6253. The result is shown with the value of Comparative Example 1 as an index of 100. The larger the index, ...

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Abstract

The present invention provides a rubber composition for a tire sidewall which improves fuel consumption while suppressing a decrease in hardness and is excellent in cut resistance and bending fatigue resistance, and a pneumatic tire using the rubber composition. The rubber composition for a tire sidewall and the pneumatic tire using the rubber composition in the sidewall (2) are characterized in that the rubber composition has a content of cis-1,4 bonds of 97% or more and a temperature of 100°C. The ratio of the Mooney viscosity (ML1+4) to the Mooney viscosity (T-cp) / (ML1+4 ) is 2.0 or more of 30 to 70% by mass of butadiene rubber and 30 to 70% by mass of other diene-based rubbers. 100 parts by mass of rubber components, containing nitrogen adsorption specific surface area of ​​20 to 35m2 / g and 30 to 40 parts by mass of carbon black with a DBP oil absorption of 50 to 95 cm3 / 100 g.

Description

technical field [0001] The present invention relates to a rubber composition for a tire sidewall and a pneumatic tire using the rubber composition, and more specifically, to a rubber composition which suppresses a decrease in hardness while improving fuel efficiency and which is also excellent in cut resistance and bending fatigue resistance Rubber composition for tire sidewall and pneumatic tire using the rubber composition. Background technique [0002] In recent years, as environmental awareness has increased, there has been an increasing demand for improved tire fuel efficiency. With regard to rubber compositions for tire sidewalls, not only improvements in damage resistance but also improvements in fuel consumption are strongly demanded in the industry. [0003] As a method proposed for reducing the heat generation of the rubber composition for a tire sidewall, for example, a method of reducing the amount of filler compounded is mentioned. However, when using these me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L9/00B60C1/00C08K3/04
CPCB60C1/0025C08L9/00C08L21/00C08K3/04C08L7/00
Inventor 和田智之
Owner THE YOKOHAMA RUBBER CO LTD
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