To obtain carbon black suitable for tire tread simultaneously satisfying improvement in wear resistance and fuel cost characteristics, to provide a method for producing the carbon black and to obtain a rubber composition.
This carbon black belongs a hard-based region having ≥80 (m2/g) CTAB(cetyltetraammonium bromide) and ≥80 (mL/100 g) compression DBP and satisfies selective characteristic requirements of (1) oxygen content (0; wt.%); 0.5×10-3≤0/CTAB≤1.0×10-2, (2) a strong acidic group concentration (SA; meq/g) measured by Na2CO3; SA/CTAB≤1.0×10-4, (3) a basic functional group concentration (B; meq/g); 2.5×10-4≤B/CTAB≤1.5×10-3, (4) a physical absorption rubber amount (A); 1.6×10-4≤A≤1.0×10-3. The carbon black is produced by oxidizing carbon black and heat-treating in a nonoxidizing atmosphere at ≥600°C. This rubber composition is obtained by compounding 20-100 pts.wt. of the carbon black with 100 pts.wt. of rubber.
Kono, Taro
Sasaki, Kenryo
Mukai, Koichiro
Sawa, Yasuhisa
Kanai, Takaaki
Kurihara, Masaki
Ota, Yuji
