Verfahren zur Herstellung von Farbruss nach dem Furnace-Verfahren

摘要

Color blacks of low pH are prepared from furnace blacks by treating the black before separation from the gas phase but after cooling at a temperature between 600 DEG and 150 DEG C., preferably between 500 DEG and 250 DEG C, with an aqueous solution of hydrogen peroxide. Preferably potassium is present in the feedstock in an amount sufficient that the finished carbon black has at least 150 ppm of potassium.