METHOD OF OBTAINING SPHERICAL CARBON BLACK PARTICLES AND SPHERICAL CARBON BLACK OBTAINED THEREBY

摘要

Carbon black beads, which contain natural and/or synthetic wax and are produced by granulating carbon black powder, have a wax content of 1 to less than 10 wt.% and a hardness greater than 0.15 N. An Independent claim is also included for the continuous production of the beads. The beads are produced in a heated granulator with a toothed shaft and inlet, granulation and outlet zones. The carbon black powder is fed into the inlet zone. Molten wax or wax mixture with an average droplet size NOTGREATER 50 micron is sprayed into the first third of the granulation zone. The shaft operates at a maximum peripheral velocity of 1-6 m/s and the average residence time of the carbon black in the machine is 20-600 seconds.