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    • 1. 发明授权
    • Phenolic resin composition
    • 酚醛树脂组合物
    • US5525684A
    • 1996-06-11
    • US376146
    • 1995-01-20
    • Tomoyuki KawabataShigeru IimuroTeruo Yuasa
    • Tomoyuki KawabataShigeru IimuroTeruo Yuasa
    • C08L61/06C08L63/00C08L65/00C08L61/04C08L61/10C08L63/02
    • C08L65/00C08L63/00C08L61/06
    • A phenolic resin composition comprises a mixture of 100 parts by weight of a phenol aralkyl resin and 5 to 60 parts by weight of a novolak type phenolic resin having a content of binuclear components of not more than 10% by area, and a content of trinuclear components of not less than 50% by area and a sum content of tri- and tetra-nuclear components of 75% by area based on the total novolak phenolic resin except for the binuclear components, and an epoxy-cured product obtained by curing an epoxy resin while using the phenolic resin composition as set forth in claim 1 as a curing agent. The phenolic resin composition has a low viscosity and, when it is used as a curing agent for epoxy resins, the resulting epoxy-cured product has a low water absorption rate, is excellent in resistance to moisture and has a high glass transition temperature as compared with the cured product obtained using a novolak type phenolic resin as a curing agent.
    • 酚醛树脂组合物包含100重量份苯酚芳烷基树脂和5至60重量份具有不超过10面积%的双核成分含量的酚醛清漆型酚醛树脂和三核含量的混合物 基于除双核成分以外的总酚醛清漆酚醛树脂的面积为面积的不小于50%的三组分和四核组分的总含量为75%的环氧树脂固化产物,以及通过固化环氧树脂 树脂,同时使用如权利要求1所述的酚醛树脂组合物作为固化剂。 酚醛树脂组合物具有低粘度,当用作环氧树脂的固化剂时,得到的环氧固化产物的吸水率低,耐湿性优异,玻璃化转变温度高 使用酚醛清漆型酚醛树脂获得的固化产物作为固化剂。
    • 3. 发明授权
    • Preparation process of phenol aralkyl resins
    • 苯酚芳烷基树脂的制备方法
    • US6127511A
    • 2000-10-03
    • US204552
    • 1998-12-03
    • Tomoyuki KawabataYuzo OnoTeruo YuasaYukio Fukui
    • Tomoyuki KawabataYuzo OnoTeruo YuasaYukio Fukui
    • C08G65/38
    • C08G65/38
    • A preparation process of phenol aralkyl resin from phenol compound and aralkyl compound by controlling the temperature of reaction mass in the range of 70 to 240.degree. C. and simultaneously controlling the temperature of vapor phase potion and vapor-liquid interface portion of manufacturing equipment so as to keep the wall surface of the vapor phase portion and vapor-liquid interface portion in a wet state. The invention can prevent scale adhesion to the interior of manufacturing equipment, remarkably reduce the number of washing and scale removing procedures on the manufacturing equipment, and enable efficient manufacture of phenol aralkyl resin. When the phenol aralkyl resin obtained is used for a molding material, molded articles having excellent heat resistance and high reliability can be provided.
    • 通过将反应物质的温度控制在70〜240℃的范围内,由苯酚化合物和芳烷基化合物制备苯酚芳烷基树脂,同时控制制造设备的气相药液和气 - 液界面部分的温度,以便 以保持气相部分和汽液界面部分的壁表面处于湿润状态。 本发明能够防止水垢附着在制造装置的内部,显着地减少了制造装置的洗涤和除垢程序,能够高效地制造苯酚芳烷基树脂。 得到的苯酚芳烷基树脂用于成型材料时,可以提供耐热性优异,可靠性高的成型品。
    • 6. 发明授权
    • Circuit for detecting defects of a magnetic recording head
    • 用于检测磁记录头缺陷的电路
    • US4862078A
    • 1989-08-29
    • US186153
    • 1988-04-26
    • Tomoyuki Kawabata
    • Tomoyuki Kawabata
    • G01R33/12G11B5/09G11B5/455G11B19/04
    • G11B5/09G01R33/12G11B5/455G11B19/04
    • When recording information, a write switching current of a write signal is directed through a coil of a magnetic head, whereby the information corresponding to the write signal is to be recorded on a magnetic recording medium. Hence, a back electromotive voltage is inevitably produced at the coil of the magnetic head. Based on the level of this back electromotive voltage, the quality of the magnetic head can be detected. In this case, by use of a synchronizing circuit, the detected timing of the back electromotive voltage is synchronized with a switching timing of the write switching current. Due to this synchronizing circuit, the back electromotive voltage is detected only at the switching timing of the write switching current, whereby it becomes possible to detect the back electromotive voltage, regardless of noise. Thus, it is possible to detect the quality of the magnetic head with accuracy.
    • 当记录信息时,写入信号的写入开关电流被引导通过磁头的线圈,由此将与写入信号相对应的信息记录在磁记录介质上。 因此,磁头的线圈不可避免地产生反向电动势。 根据该反电动势的电平,可以检测磁头的质量。 在这种情况下,通过使用同步电路,检测到的反电动势电压的定时与写入开关电流的切换定时同步。 由于该同步电路,仅在写入开关电流的切换定时检测反向电动势,所以无论噪声如何,都可以检测反电动势电压。 因此,可以精确地检测磁头的质量。