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Rubber composition and pneumatic tire using same

A rubber composition, natural rubber technology, applied in special tires, tire parts, transportation and packaging, etc., can solve problems such as poor appearance of tire sidewalls, and achieve the effect of preventing poor appearance

Active Publication Date: 2017-06-06
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the current field that is strongly required to improve the quality of tires, it is required to further solve the problem of poor appearance of tire sidewalls.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～19 and comparative example 1～12

[0069] sample preparation

[0070] Mix the ingredients (parts by mass) shown in Table 1 and Table 2 except the vulcanization accelerator and sulfur in a 1.7-liter closed Banbury mixer for 5 minutes, and then place it at about 150°C for mixing. Outside the machine, cool at room temperature. Next, a vulcanization accelerator and sulfur were added to this composition, and the mixture was kneaded with open rolls to obtain a rubber composition. Next, the obtained rubber composition was vulcanized by pressing in a predetermined mold at 170° C. for 10 minutes to obtain vulcanized rubber test pieces, and the physical properties of the vulcanized rubber test pieces were measured by the following test methods.

[0071] Appearance: It left still in the oven of 40 degreeC for 2 weeks, and visually evaluated according to the following standard.

[0072] Point 1: Whitened as a whole.

[0073] Point 2: About 30% of the whole area turns white.

[0074] Point 3: The overall hair is black. ...

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Abstract

The present invention discloses a rubber composition characterized in that 1 to 2.5 parts by mass of wax and polyalkylmethacrylate or polybutene resin are compounded with respect to 100 parts by mass of diene rubber containing natural rubber. , when compounding the polyalkyl methacrylate, the polyalkyl methacrylate is compounded at 0.5 to 3 parts by mass relative to 100 parts by mass of the diene rubber containing natural rubber, and when compounding the polyalkyl methacrylate In the case of a butene resin, the polybutene resin is blended in an amount of 1.0 to 5.0 parts by mass relative to 100 parts by mass of the diene rubber containing natural rubber, and the molar ratio of the wax to the polybutene resin is the former / The latter is in the range of 0.8 to 3.2. Also disclosed is a pneumatic tire using the rubber composition in a sidewall.

Description

technical field [0001] The present invention relates to a rubber composition and a pneumatic tire using the same, and more particularly, to a rubber composition capable of preventing whitening from causing poor appearance due to whitening without deteriorating various properties required for tire sidewalls, and to using the same pneumatic tires. Background technique [0002] Conventionally, hydrocarbon-based waxes have generally been blended into rubber compositions in order to prevent rubber cracks caused by ozone. However, when such a wax is blended, it gradually precipitates and solidifies on the surface of the rubber during long-term use, resulting in the whitening of the rubber surface and deterioration of the appearance. [0003] For this purpose, for example, Patent Document 1 below discloses a rubber composition containing 15 to 100 parts by weight of a photocatalyst with respect to 100 parts by weight of diene rubber and not containing wax. In addition, Patent Doc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L7/00B60C1/00C08L23/20C08L33/10C08L91/06
CPCC08L7/00C08L91/06B60C1/0025C08L23/20C08L33/20C08L33/10C08L9/00
Inventor 加藤学
Owner THE YOKOHAMA RUBBER CO LTD
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