Surface-treated rare earth-based magnetic particles, resin composition for bonded magnets comprising the earth-based magnetic particles and bonded magnet comprising the earth-based magnetic particles
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United States of America Patent
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Feb 14, 2017
Grant Date -
Dec 29, 2011
app pub date -
Feb 3, 2010
filing date -
Feb 3, 2009
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Abstract
The present invention relates to surface-treated rare earth-based magnetic particles comprising rare-earth-based magnetic particles, a first coating layer comprising a phosphoric acid compound which is formed on a surface of the respective magnetic particles and a second coating layer in the form of a composite coating film comprising a silicon compound and a phosphoric acid compound which is formed on a surface of the first coating layer, wherein an amount of Fe eluted from the rare earth-based magnetic particles is not more than 10 mg/L; a resin composition for bonded magnets comprising the above surface-treated rare earth-based magnetic particles and a resin; and a bonded magnet comprising the above surface-treated rare earth-based magnetic particles.
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