| 摘要 |
PROBLEM TO BE SOLVED: To obtain a carbon black for compounding in rubber for functional parts, which is able to impart a high level of a permanent set in fatigue to a compound rubber and also impart a high heat generation property to the rubber when subjected to UHF vulcanization, and thus, can be well-balanced in the both characteristics, and a rubber composition for functional parts compounded with the carbon black. SOLUTION: The carbon black for compounding in rubber for functional parts has such characteristics that a CTAB specific surface area ranges from 20 to 40 m2/g, an electric resistivity is 0.3Ω.cm or below when compressed under a pressure of 50 kg/cm2, and a toluene discoloration transmittance (LT) of 95% or over. The rubber composition for functional parts comprises 20 to 200 pts.wt. of the carbon black in 100 pts.wt. of natural rubber, synthetic rubber or a blend thereof.
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