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AssigneeSeiko Epson Corporation
InventorsKen Ikuma, Toshiyuki Ishibashi, Koji Akioka
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The addition of a chelating agent or a chelating agent and an antioxidant in combination to a rare-earth bonded magnet composition and a rare-earth bonded magnet comprising a rare-earth magnetic powder and a resin component can provide improved moldability and magnets having high performance and high corrosion resistance. Further, the regulation of property values of the magnet composition enables the occurrence of troubles to be avoided during molding, resulting in improved productivity. Furthermore, the use of at least two resins as a resin component in an extruding composition contributes to improvement in moldability and consequently increase in throughput. Furthermore, the use of extrusion, involving setting by cooling, and not compression molding in the production of magnets can provide high-density, high-performance magnets.
A rare-earth bonded magnet composition for extrusion, comprising a rare-earth magnetic powder and a polyamide resin containing an additive, said composition having a viscosity .eta.1, as measured in a molten state before charging into an extruder, of
A rare-earth bonded magnet composition for injection molding, comprising a rare-earth magnetic powder and a polyamide resin containing an additive, said composition having a viscosity .eta.3, as measured in a molten state before charging into an injection molding machine, of
Dependencies are inferred from the claim text.