Non-magnetic black particles, non-magnetic black pigment therefrom and non-magnetic black filler therefrom

摘要

In accordance with the present invention, there are provided non-magnetic black particles composed primarily of Fe and having a hematite structure, which shows an excellent blackness, heat resistance, and dispersibility in a vehicle, and which particles contain manganese in an amount of 5 to 40% by weight based on the weight of the non-magnetic black particles, a soluble sodium salt in an amount of not more than 500 ppm (calculated as Na), and a soluble sulfate in an amount of not more than 200 ppm (calculated as SO4), and have an average particle size of 0.1 to 10.0 mu m and a pH of not less than 5.5.