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    • 13. 发明专利
    • FLOPPY DISK JACKET
    • JPS60234274A
    • 1985-11-20
    • JP8928584
    • 1984-05-07
    • MITSUI TOATSU CHEMICALS
    • TAKAHASHI TAKASHIUEKI TOORUUSAMI KATSUYUKICHITOKU HAJIME
    • G11B23/033
    • PURPOSE:To obtain a floppy disk jacket which exceles in conduction performance, mechanical strength and folding performance for production of boxes, by compounding a specific amount of hydrogenated petroleum resin, talc and carbon black to polypropylene. CONSTITUTION:The 2-8pts.wt. hydrogenated petroleum resin, 55-60pts.wt. talc and 12-30pts.wt. carbon black are compounded to 100pts.wt. polypropylene. Thus polypropylene composition is obtained and formed into a sheet by a T-die process, etc. Then a floppy disk jacket is obtained by applying the cutting, liner bonding, folding and piercing finish processes to said sheet polypropylene composition. A copolymer of polypropylene which contains 20wt% alpha-olefin such as ethylene, buten -1, etc. is also available in addition to a single polymer of polypropylene. The folding performance for production of boxes is improved for the hydrogenated petroleum resin with use of talc. The carbon black improves the electric properties. Thus it is possible to obtain a floopy disk jacket which excels in heat resistance and the flat plate properties.