Magnetic Beads
AssigneeSeiko Epson Corporation
InventorsMichio NAKAMORI, Yasunari IKEDA, Takeyoshi USHIKI
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Abstract
A magnetic bead includes a magnetic metal powder and a coating layer coating the surface of the magnetic metal powder, the magnetic metal powder having magnetic properties of 100 to 200 emu/g and a volume-based particle size distribution of 1.0 to 25 μm, the coating layer including a first layer as an outermost layer and a porous second layer formed between the first layer and the magnetic metal powder, and the film thickness of the first layer being smaller than the film thickness of the second layer. The coating layer further includes a third layer between the second layer and the magnetic metal powder.
Claims7
A magnetic bead comprising:
- a magnetic metal powder and a coating layer coating the surface of the magnetic metal powder,
- wherein the magnetic metal powder has magnetic properties of 100 to 200 emu/g and a volume-based particle size distribution D50 of 1.0 to 25 μm,
- the coating layer includes a first layer as an outermost layer and a porous second layer formed between the first layer and the magnetic metal powder, and
- the film thickness of the first layer is smaller than the film thickness of the second layer.
Dependencies are inferred from the claim text.