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    • 35. 发明授权
    • Process for production of stabilized oxymethylene copolymer
    • 稳定的甲醛共聚物的生产方法
    • US5948841A
    • 1999-09-07
    • US894164
    • 1997-07-29
    • Hideki Nakamura
    • Hideki Nakamura
    • C08G2/30C08K5/00C08K5/134C08K5/18C08K5/098
    • C08K5/005C08G2/30C08K5/1345
    • A process for producing a stabilized oxymethylene copolymer, which comprises subjecting a crude oxymethylene copolymer to terminal stabilization in an extruder (A) having a terminal-stabilizing zone and a vacuum zone for volatile components removal to obtain a terminal-stabilized oxymethylene copolymer, separately melt-kneading a polyoxymethylene and a stabilizer and/or an additive in other extruder (B), feeding the resulting melt-kneading mixture in a molten state into a section of the extruder (A) following the vacuum zone for volatile components removal so that the proportions of the polyoxymethylene to be fed from the extruder (B) and the crude oxymethylene copolymer to be subjected to terminal stabilization in the extruder (A) become 1:3 to 1:45 by weight ratio, and kneading the polyoxymethylene, the stabilizer and/or the additive and the terminal-stabilized oxymethylene copolymer.
    • PCT No.PCT / JP96 / 00149 Sec。 371日期1997年7月29日第 102(e)日期1997年7月29日PCT 1996年1月26日PCT PCT。 第WO96 / 23825号公报 日本1988年8月8日制造稳定化的甲醛共聚物的方法,其包括在具有末端稳定区域和真空区域的挤出机(A)中将粗甲醛共聚物端稳定化,以除去挥发性组分以获得末端稳定化 甲醛共聚物,在其他挤出机(B)中单独熔融捏合聚甲醛和稳定剂和/或添加剂,将所得熔融捏合混合物以熔融状态进料到挤出机(A)的一部分中,在真空区之后进行挥发性 使得从挤出机(B)中进料的聚甲醛和在挤出机(A)中进行终端稳定化的粗甲醛共聚物的比例按重量比计为1:3至1:45的比例混合, 聚甲醛,稳定剂和/或添加剂和末端稳定的甲醛共聚物。
    • 38. 发明授权
    • Sintered magnet and method for making
    • 烧结磁体及其制造方法
    • US5641363A
    • 1997-06-24
    • US364756
    • 1994-12-27
    • Akira FukunoHideki NakamuraGouichi Nishizawa
    • Akira FukunoHideki NakamuraGouichi Nishizawa
    • B22F3/11H01F1/057H01F1/03
    • H01F1/0577B22F3/1103B22F2998/10
    • In the manufacture of a rare earth sintered magnet of the Nd.sub.2 Fe.sub.14 B system, closed voids are formed in the magnet in a predetermined fraction to minimize shrinkage. Unlike open voids or pores in conventional semi-sintered magnets, the closed voids do not incur magnet corrosion since they do not communicate to the magnet exterior. By minimizing shrinkage during sintering in this way, a ring or plate-shaped thin wall anisotropic magnet can be prepared without machining for shape correction, achieving a cost reduction and a productivity improvement. Since a high density compact has a high deflective strength, it is easy to handle, minimizing cracking and chipping between the compacting and sintering steps.
    • 在制造Nd2Fe14B系稀土烧结磁体时,以预定的比例在磁体中形成封闭的空隙,以使收缩率最小化。 与常规半烧结磁体中的开放空隙或孔不同,封闭的空隙不会引起磁体腐蚀,因为它们不与磁体外部连通。 通过以这种方式使烧结期间的收缩最小化,可以在不进行形状校正的机械加工的情况下制备环形或板状的薄壁各向异性磁体,从而实现成本降低和生产率提高。 由于高密度压块具有高的偏转强度,因此易于处理,使压实和烧结步骤之间的裂纹和碎裂最小化。