Patent ID: 6056933
Filing Date: 2000-05-02
Classification: B60C,B82Y,C01P,C08K,C09C,Y02T

Abstract:
Furnace carbon black with a CTAB value of 20-190 m.sup.2 /g and 24M4-DBP absorption of 40-140 mL/100 g, with a tan .delta..sub.0 /tan .delta..sub.60 ratio which, when incorporated in an SSBR/BR rubber compound, satisfies the relationtan .delta..sub.0 /tan .delta..sub.60 >2.76-6.7.times.10.sup.-3 .times.CTAB,where the value of tan .delta..sub.60 is always lower than the value for ASTM carbon blacks with identical CTAB surface area and 24M4-DBP absorption, wherein the distribution curve of the particle sizes has an absolute slope of less than 400,000 nm.sup.3 wherein the absolute slope AS is determined by the following formula from the measured aggregate size distribution of the carbon black: ##EQU2## wherein H.sub.i denote the frequency at which the particle diameter x.sub.i occurs and x is the particle diameter of the aggregate, whose weight corresponds to the average particle weight of the carbon black aggregate and the summation is in the range of 1 to 3000 nm in equidistant spacing for each nanometer.