Elastomeric matrix reinforced with precipitated silicas
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United States of America Patent
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Apr 10, 2001
Grant Date -
N/A
app pub date -
Nov 29, 1999
filing date -
Sep 29, 1993
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Abstract
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 m.sup.2 /g, a median diameter .phi..sub.50, after ultrasonic disintegration, less than 2.8 .mu.m, exhibiting an ultrasonic disintegration factor F.sub.D greater than 3 ml, having a BET specific surface ranging from 100 to 200 m.sup.2 /g, having a mean particle size greater than 15 .mu.m, 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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