Abstract:
PROBLEM TO BE SOLVED: To obtain a carbon black having, in a rubber compound, higher or nearly equal dynamic rigidity (E*60°C) and simultaneously reduced hysteresis (tanδ 60°C). SOLUTION: The carbon black having an organic group containing an isocyanate group is produced by reacting a carbon black with an organic compound having at least one thiocyanate group containing C-C double bond or triple bond other than a constituent component of aromatic compounds, wherein the C-C double bond and triple bond are activated by at least one substituent. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To obtain an improved furnace carbon black having a decreased high-load abrasion, by keeping below a specific value the abs. slope of the particle size distribution curve of a furnace carbon black having a specific CTAB value, 24M4-DBP absorption quantity, etc. SOLUTION: The absolute slope AS of the particle size distribution curve shown in the equation of a furnace carbon black is kept below 400,000 nm , the carbon black having a CTAB value of 20-190 m /g and a 24M4-DBP absorption quantity of 40-140 ml/100 g, satisfying the correlation: tan δ0 / tanδ60 >2.76-6.7×10 XCTAB while formulating an SSBR/BR rubber compd., and with a tan δ60 value always lower than that of an ASTM carbon black having the same CTAB surface area and 24M4-DBP absorption quantity. In the equation, Hj represents a frequency of occurrence of particle size Xi, X bar is a particle size of an aggregate corresponding to the average particle wt. of the aggregate, and the total summation is kept in the range of 1-300 nm.
Abstract:
The invention relates to black having a CTAB surface area of 100 to 160 m²/g, a quartile ratio of more than 1.60, and an FP index of >0. Said black is produced in a furnace reactor. Sixty to 90 percent by weight of the raw black material are injected into the reactor in the first third of the reaction zone, while the remaining amount of the raw black material is injected into the reactor upstream at least in one other point. In addition, the combustible is conducted such that 90 to 100 percent by weight of the combustible are evaporated when first hitting the raw black material and 80 to 99 percent by weight of the combustible are evaporated 5ms before hitting the raw black material. Said blacks can be used in rubber mixtures.
Abstract:
Furnace carbon black is incorporated into an SSBR/BR rubber compound. The carbon black has CTAB value of 20-190m /g and 24M4-DBP absorption of 40-140 ml/100 g, with tan delta 0/tan delta 60 ratio which satisfies the relation tan delta 0/tan delta 60 \> 2.76-6.7 \* 10 \* CTAB, where tan delta 60 is lower than the value for ASTM carbon blacks with identical CTAB surface area and 24M4-DBP absorption. The distribution curve of the particle sizes has an absolute slope of less than 400000 nm . The slope is determined from formula AS = EPSILON Hi(xi-x) / EPSILON Hi(I), where both the numerator and denominator are summed from i = l to i = k. HI = frequency at which the particle diameter xI occurs; and x = 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 1-3000 nm in equidistant spacing for each nanometer.
Abstract:
The invention relates to black having a CTAB surface area of 100 to 160 m?/g, a quartile ratio of more than 1.60, and an FP index of >0. Said black is produced in a furnace reactor. Sixty to 90 percent by weight of the raw black material are injected into the reactor in the first third of the reaction zone, while the remaining amount of the raw black material is injected into the reactor upstream at least in one other point. In addition, the combustible is conducted such that 90 to 100 percent by weight of the combustible are evaporated when first hitting the raw black material and 80 to 99 percent by weight of the combustible are evaporated 5 ms before hitting the raw black material. Said blacks can be used in rubber mixtures.
Abstract:
Preparation of a rubber mixture comprises adding a pyrogenically manufactured silicon dioxide, in the form of flakes with a tamped density (according to DIN EN ISO 787-11) of 185-700 g/l, to the other component mixtures.