BLACK DOUBLE OXIDE PARTICLES, PROCESS FOR PRODUCTION THEREOF, BLACK PASTES, AND BLACK MATRIXES

摘要

Black double oxide particles which contains 35 to 70 wt% of cobalt and 5 to 40 wt% of manganese at a Co/Mn mole ratio of 0.5 to 14 and which has a primary particle mean diameter of 0.05 to 0.3µm and an octahedral shape. The particles can be produced by wet oxidation without baking and are substantially free from all the metal elements except cobalt and manganese. The particles are useful as black pigment suitable for coating material, ink, toner, rubbers, and plastics.