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Rubber composition for tire and pneumatic tire
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A rubber composition and tire technology, applied in the field of pneumatic tires and rubber compositions for tires, can solve the problems of no prompting and suppression of whitening
Active Publication Date: 2018-07-17
TOYO TIRE & RUBBER CO LTD
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However, none of the above-mentioned documents suggests that whitening can be suppressed by adjusting the number of carbon atoms in the wax and the number of carbon atoms in the fatty acid metal salt.
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[0055] Examples of the present invention are shown below, but the present invention is not limited to these Examples.
no. 1 Embodiment
[0057] Using a Banbury mixer, according to the compounding (parts by mass) shown in the following Table 1, first, in the first mixing stage, other compounding ingredients except sulfur and vulcanization accelerator were added to the diene rubber and carried out. Kneading (discharge temperature = 160°C); then, at the final mixing stage, sulfur and a vulcanization accelerator were added to the resulting kneaded product and kneaded (discharge temperature = 90°C) to prepare a rubber composition. The details of each component in Table 1 are as follows.
[0096] Using a Banbury mixer, rubber compositions were prepared in the same manner as in the first example in accordance with the compounding (parts by mass) shown in Table 2 below. The details of each component in Table 2 are as follows (the same components as those described in Table 1 are as described above).
[0101] Each rubber composition was vulcanized at 160° C. for 20 minutes to produce a test piece, and the appearance (whitening) and ozone resistance were evaluated. Each evaluation method is as above.
[0102]
[0103] As shown in Table 1, compared with Comparative Example 1 as a control, in Comparative Example 2 in which wax was blended, the ozone resistance was impro...
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Abstract
A rubber composition for a tire comprises a diene rubber, a petroleum-derived wax and a fatty acidmetal salt, wherein the difference (delta=Cmw-Cmf) obtained by subtracting the carbon number (Cmf) of a constituent fatty acid contained the most in the fatty acidmetal salt from the carbon number (Cmw) of a hydrocarbon contained the most in the petroleum-derived wax is -10 or more and 8 or less. The rubber composition can suppress whitening of a rubber surface while maintaining ozone resistance. A pneumatic tire has a rubber part comprising the rubber composition, wherein the rubber part is at least one selected from the group consisting of a tread rubber, a side wall rubber, and a rim strip.
Description
technical field [0001] The present invention relates to a rubber composition for tires and a pneumatic tire using the same. Background technique [0002] In order to suppress deterioration due to ozone or ultraviolet rays in the air, waxes are compounded in the rubber composition forming the tread rubber, sidewall rubber, and gasket of the pneumatic tire. Wax has an effect of suppressing deterioration such as ozone resistance, but on the other hand, blooms on the rubber surface to whiten the tire surface, which is a cause of poor tire appearance. Therefore, it is necessary to suppress whitening while maintaining ozone resistance. [0003] In order to suppress the whitening caused by wax, Japanese Patent Application Laid-Open No. 2015-017273 discloses that a natural wax with a low softening point component and a polar natural wax with a high softening point component are mixed with polar rubber, dioxide The content of the rubber composition of silicon and carbon black. In ...
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