Carbon black and processes for manufacturing
AssigneeDegussa AG
InventorsAlfons Karl, Burkhard Freund, Karl Vogel
Life of this patent
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Abstract
Carbon blacks containing silicon and a process for manufacturing them. The carbon blacks containing silicon are suitable as reinforcing carbon blacks for rubber mixtures and give the latter viscoelastic properties such as reduced rolling resistance in tires. At the same time, the wet traction is even improved in the process.
Claims12
A carbon black with a CTAB surface between 40 and 180 m.sup.2 /g, a 24M4-DBP absorption between 40 and 140 ml/100 g, and a specific BET surface between 80 and 250 m.sup.2 /g, and comprising 0.01 to 15% chemically incorporated silicon by weight and 0.01 to 1% chemically incorporated by nitrogen by weight in relation to its total weight.
A process for manufacturing a carbon black comprising oxidatively pyrolyzing a carbon black feedstock that contains carbon, wherein said feedstock is mixed with an organic compound containing silicon, and optionally nitrogen, or silicon tetrachloride whereby a carbon black is obtained having a CTAB surface between 40 and 180 m.sup.2 /g, a 24M4-DBP absorption between 40 and 140 ml/100 g, and a specific BET surface between 80 and 250 m.sup.2 /g, and comprising 0.01 to 15% silicon by weight in relation to its total weight.
A process for manufacturing a carbon black comprising oxidatively pyrolyzing a carbon black feedstock that contains carbon, wherein said feedstock is mixed with hexamethyldisilazane whereby a carbon black is obtained having a CTAB surface between 40 and 180 m.sup.2 /g, a 24 M4-DBP absorption between 40 and 140 ml/100 g, and a specific BET surface between 80 and 250 m.sup.2 /g, and comprising 0.01 to 15 percent silicon by weight in relation to its total weight.
Dependencies are inferred from the claim text.