| 摘要 |
A mechanically strong, vulcanized elastomeric matrix having an effective amount of a reinforcing filler material homogeneously dispersed and distributed therethrough, the reinforcing filler material comprising finely divided precipitated silica particulates and the precipitated silica particulates deriving from a powder having a CTAB specific surface ranging from 100 to 140 m2/g, a median diameter phi50, after ultrasonic disintegration, less than 2.8 mum, exhibiting an ultrasonic disintegration factor FD greater than 3 ml, having a BET specific surface ranging from 100 to 200 m2/g, having a mean particle size greater than 15 mum, a packing density in the tamped state of at least 0.17, and a DOP oil uptake ranging from 150 to 400 ml/100 g.
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