Patent ID: 7071257

Claim:
A vulcanized rubber compound comprising precipitated silica having the following physico-chemical properties: BET surface area: 35 m 2 /g to 350 m 2 /g; BET/CTAB surface area ratio: 0.8 to 1.1; Pore volume, PV: 1.6 ml/g to 3.4 ml/g; Sears value (V 2 ): 6 to 20 ml/(5 g); average aggregate size: 250 nm to 1500 nm; CTAB surface area: 30 m 2 /g to 350 m 2 /g; DBP volume: 150 ml/100 g to 300 ml/100 g; V 2 /V 1 by Hg porosimetry: 0.19 to 0.46; and DBP/CTAB: 1.2 to 3.5.