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    • 9. 发明专利
    • MAGNETIC RECORDING MEDIUM
    • JPS61202329A
    • 1986-09-08
    • JP4129985
    • 1985-03-04
    • DAINICHISEIKA COLOR CHEMUKIMA GOSEI KK
    • TORII HIDEYASUHANADA KAZUYUKI
    • G11B5/702C09D5/23C09D175/00C09D175/04
    • PURPOSE:To stabilize the dispersion of magnetic particles by forming a dispersant of the resultant product of reaction of a silane coupling agent having a reactive org. functional group and an org. polyisocyanate and incorporating >=1 free isocyanate group therein. CONSTITUTION:A magnetic layer is formed of the magnetic particles, binder resin and dispersion consisting of a dispersant and medium. The dispersant is the resultant product of reaction of the silane coupling agent having the reactive org. functional group and org. polyisocyanate and has at least one free isocyanate group. The dispersant acts to disperse easily and stably the magnetic particles into the liquid medium contg. the binder resin in the stage of dispersing said particles into the medium. The resultant dispersion is free from gelation, thickening or settling and separating of the magnetic particles by flocculation even after long-period preservation. Bleeding on the surface of the coated film and the decrease in the strength of the coated film are obviat ed and the electrical, chemical and physical performances of the coated film are rather improved even if the magnetic layer is formed by coating the result dispersion on a substrate and drying the same.