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AssigneeToda Kogyo Corporation
InventorsKenji Okinaka, Masayuki Uegami
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Secondary agglomerates of magnetic metal particles containing primary particles having an average major axial diameter of 0.05 to 0.25 μm, said secondary agglomerates having an average particle diameter of 300 to 800 μm, an upper limit of particle diameter of 2,000 μm and a repose angle of 38 to 45°. The secondary agglomerates exhibit not only excellent handing property due to high storage efficiency, high transport efficiency and good flowability thereof, but also excellent kneading property when kneaded with various binder resins and organic solvents in a kneader, and excellent dilution-dispersibility when diluted with an additional amount of the organic solvent, upon the production of coating-type magnetic recording media, so as to more improve a surface smoothness and squareness of a magnetic coating film obtained therefrom, and a process for producing such secondary agglomerates of magnetic metal particles for magnetic recording.
Secondary agglomerates of magnetic metal particles comprising magnetic metal primary particles having an average major axial diameter of 0.05 to 0.25 μm, said secondary agglomerates having an average particle diameter of 300 to 800 μm, an upper limit of particle diameter of 2,000 μm and a repose angle of 38 to 45°, and the amount of the secondary agglomerates having a diameter of not more than 53 μm is more than 30% by weight.
Secondary agglomerates of magnetic metal particles comprising magnetic metal primary particles having an average major axial diameter of 0.05 to 0.25 μm, said secondary agglomerates having an average particle diameter of 300 to 800 μm, an upper limit of particle diameter of 2,000 μm, a repose angle of 38 to 45° the amount of the secondary agglomerates having a diameter of not more than 53 μm is not more than 30% by weight a bulk density of 0.35 to 0.65 g/ml, a tap density of 0.39 to 0.75 g/ml and a compaction percentage of 10 to 15%.
A magnetic recording medium comprising a non-magnetic substrate and a magnetic recording layer formed on the non-magnetic substrate comprising a binder resin and magnetic metal particles containing iron as a main component which are derived from secondary agglomerates of magnetic metal particles containing primary particles having an average major axial diameter of 0.05 to 0.25 μm, said secondary agglomerates having an average particle diameter of 300 to 800 μm, an upper limit of particle diameter of 2,000 μm a repose angle of 38 to 45°°, and the amount of the secondary agglomerates having a diameter of not more than 53 μm is not more than 30% by weight.
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