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    • 1. 发明授权
    • Rare earth bonded magnet, rare earth magnetic composition, and method
for manufacturing rare earth bonded magnet
    • 稀土粘结磁铁,稀土磁性组合物,稀土类粘结磁铁制造方法
    • US6143193A
    • 2000-11-07
    • US744014
    • 1996-11-05
    • Koji AkiokaHayato ShiraiKen IkumaMitsuru TakeiYoshiki Nakamura
    • Koji AkiokaHayato ShiraiKen IkumaMitsuru TakeiYoshiki Nakamura
    • H01F1/055H01F1/057H01F1/059B22F3/00
    • H01F1/0578H01F1/0558H01F1/059
    • A rare earth bonded magnet comprising a rare earth magnet powder bonded with a binder resin is manufactured by extrusion or injection molding. A rare earth bonded magnet manufactured by extrusion molding has a rare earth magnet powder content of 78.1 to 83.0 percent by volume. A rare earth bonded magnet manufactured by injection molding has a rare earth magnet powder content of 68.0 to 76.0 percent by volume. Preferably, the rare earth metal powder is at least one of Sm--Co alloys, R--Fe--B alloys wherein R is at least one of rare earth elements including Y, and Sm--Fe--N alloys. Preferably, the thermoplastic resin include polyamide, liquid crystal polymer, and Polyphenylene sulfide. Preferably, the rare earth bonded metal has a void ratio of 2 percent by volume or less. A rare earth bonded magnet is manufactured by kneading a rare earth magnetic composition comprising a rare earth magnet powder and a thermoplastic resin, and by extruding or injecting the mixture after kneading. A rare earth magnetic composition used for extrusion molding contains a rare earth metal powder of 77.6 to 82.5 percent by volume, and a rare earth magnetic composition used for injection molding contains a rare earth metal powder of 67.6 to 75.5 percent by volume. Preferably, such rare earth magnetic compositions further comprise an antioxidant, such as a chelating agent. Thus, a rare earth bonded magnet showing excellent moldability and magnetic properties and high mechanical strength at a minimum binding resin can be obtained.
    • 包括用粘合剂树脂粘合的稀土磁体粉末的稀土粘结磁体通过挤出或注射成型制造。 通过挤出成型制造的稀土类粘结磁体的稀土类磁体粉末的含量为78.1〜83.0体积%。 通过注射成型制造的稀土类粘结磁体的稀土类磁体粉末含量为68.0〜76.0体积%。 优选地,稀土金属粉末是Sm-Co合金,R-Fe-B合金中的至少一种,其中R是包括Y的稀土元素和Sm-Fe-N合金中的至少一种。 优选地,热塑性树脂包括聚酰胺,液晶聚合物和聚苯硫醚。 优选稀土键合金属的空隙率为2体积%以下。 通过将包含稀土类磁铁粉末和热塑性树脂的稀土类磁性组合物进行混炼,捏合后将混合物挤出或注入,制造稀土类粘结磁铁。 用于挤出成型的稀土类磁性组合物含有77.6〜82.5体积%的稀土类金属粉末,注射成型用的稀土类磁性组合物含有67.6〜75.5体积%的稀土类金属粉末。 优选地,这种稀土磁性组合物还包含抗氧化剂,例如螯合剂。 因此,可以获得在最小粘合树脂下显示优异的成型性和磁性能以及高机械强度的稀土粘结磁体。
    • 2. 发明授权
    • Composition for rare earth bonded magnet use, rare earth bonded magnet and method for manufacturing rare earth bonded magnet
    • 稀土粘结磁铁用组合物,稀土粘结磁铁及稀土类粘结磁铁制造方法
    • US06387293B1
    • 2002-05-14
    • US09508905
    • 2000-03-16
    • Koji AkiokaYoshiki NakamuraKen Ikuma
    • Koji AkiokaYoshiki NakamuraKen Ikuma
    • H01F108
    • H01F1/0558H01F1/0578
    • A composition for a rare earth bonded magnet, the rare earth bonded magnet and the method for manufacturing the rare earth bonded magnet are provided that produce little decline in mechanical strength caused by the addition of a lubricant and have excellent molding properties. The rare earth bonded magnet of the present invention is manufactured from the composition for the magnet that contains rare earth magnetic powder, binding resin containing thermoplastic resin, and fluorine-based resin powder, by compaction molding, extrusion molding or injection molding. The fluorine-based resin powder has the properties of improving mainly lubrication between a molding and a metallic mold. The content of the fluorine-based resin powder in the composition for the rare earth bonded magnet is preferably less than 20 vol % relative to the thermoplastic resin, and the particle diameter of the fluorine-based resin powder is preferably 2-30 &mgr;m.
    • 提供稀土类粘结磁体用组合物,稀土类粘结磁体及稀土类粘结磁体的制造方法,其通过添加润滑剂而产生的机械强度几乎不下降,成型性优异。 本发明的稀土类粘结磁体是通过压缩成型,挤出成形,注射成型等方式由含有稀土类磁性粉末,含有热塑性树脂的粘合树脂和氟系树脂粉末的磁体用组合物制成的。 氟类树脂粉末具有主要改善模制品和金属模具之间的润滑性的特性。 稀土类粘结磁铁用组合物中的氟系树脂粉末的含量相对于热塑性树脂优选为20体积%以下,氟系树脂粉末的粒径优选为2-30μm。
    • 5. 发明授权
    • Method for producing resin particles and toner using the resin particles
    • 使用树脂粒子制造树脂粒子和调色剂的方法
    • US07247414B2
    • 2007-07-24
    • US11010723
    • 2004-12-13
    • Satoru MiuraKoji AkiokaKen Ikuma
    • Satoru MiuraKoji AkiokaKen Ikuma
    • G03G9/087
    • C08J3/12C08J3/16C08J2375/12G03G9/0804G03G9/0815G03G9/0819G03G9/0827
    • A method for producing resin particles mainly made of a resin material using a dispersion liquid in which a dispersoid containing the resin material is finely dispersed in a dispersion medium, the method comprising a dispersion medium removing step which comprises ejecting the dispersion liquid from a head portion in the form of droplets into a solidifying portion, conveying the droplets in the solidifying portion to remove the dispersion medium, and obtaining agglomerates each of which is composed of two ore more fine particles derived from the dispersoid, and a bonding step for welding and bonding the fine particles which constitute each of the agglomerates, thereby obtaining resin particles. The resin particles can be used for manufacturing a toner.
    • 一种主要由树脂材料制成的树脂颗粒的方法,所述树脂颗粒使用其中含有树脂材料的分散质细分散在分散介质中的分散液,所述方法包括分散介质去除步骤,该步骤包括从头部分 以液滴的形式进入固化部分,输送凝固部分中的液滴以除去分散介质,并获得每个由分散质衍生的两个以上的细颗粒组成的附聚物,以及用于焊接和粘合的粘合步骤 构成每个附聚物的细颗粒,从而获得树脂颗粒。 树脂颗粒可用于制造调色剂。