| 摘要 |
There is disclosed a process for preparing a resin composition for powder molding, comprising 50 to 97 wt % of a metal or alloy powder and 50 to 3 wt % of a thermoplastic resin having heat resistance and crystallinity, which process comprises dissolving the thermoplastic resin having heat resistance crystallinity in a solvent and at the same time, dispersing therein at least one metal or alloy powder selected from iron, brass, nickel silver, stainless steel and aluminum, having an average particle diameter of not more than 500 mu m to thereby prepare a mixture. In addition, there is disclosed a process for producing a powder molded product which comprises cold compressing molding the above resin composition and then heating the molding at a temperature not less than the melting point of the thermoplastic resin. This powder molded product has excellent dimensional stability against heat, chemical resistance, and mechanical strength. Also, there is disclosed a process for producing a magnetic powder material wherein there is added to a mixture containing a crystalline thermoplastic resin dissolved therein and magnetic powder dispersed therein a bad solvent for the resin to effect precipitation of the resin from the solution system and the resin is adhered or coated onto the magnetic powder. Other methods for forming the magentic powder material are disclosed as a resin-bonded magnetic obtained from such magnetic powder material.
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