| 摘要 |
PURPOSE:To improve a mechanical characteristic of a molded product, by orienting the magnetic powder consisting of polyamide less than a specific equivalent/kg of the terminal carboxyl radical concentration and ferromagnetic powder in a fixed direction to give it anisotropy. CONSTITUTION:A ferromagnetic powder mainly composed of the ferromagnetic powder given surface treatment with a coupling agent and the polyamide of low carboxyl radical concentration is oriented. The terminal carboxyl radical concentration of polyamide is required to be less than 70mg equivalent/kg, desirably to be less than 50mg equivalent/kg. In the case of a higher equivant than 70mg equivalent/kg, cross linking is generated at the time of heating. There is no ristriction on the lowest limit of the terminal carboxyl radical concentration so as to be able to also use a substance containing no carboxyl radical in the terminal.
|
