GRANULAR IRON OXIDE AGGREGATED PARTICLE AND POWDER CONTAINING THE AGGREGATED PARTICLE

摘要

PROBLEM TO BE SOLVED: To obtain both an iron oxide aggregated particle having excellent transportability, improved handleability and fluidity and excellent dispersibility in kneading with a resin due to its proper strength in spite of aggregated parti cle and powder containing the aggregated particle. SOLUTION: This granular iron oxide aggregated particle is obtained by aggregating an iron oxide primary particle having 0.05-1μm number-average particle diameter, has 30-3,000μm number-average particle diameter and satisfies the formula 0.02<=A/B<=0.8 when the heat loss value of the granular iron oxide aggregated particle is A (wt.%) and the specific surface area of iron oxide primary particle is B (m2/g).