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    • 10. 发明专利
    • MAGNETIC RECORDING MEDIUM
    • JPS6032120A
    • 1985-02-19
    • JP14208283
    • 1983-08-03
    • MITSUBISHI CHEM IND
    • KOBAYASHI ISANORITSUSHIMO YUKIOHOTSUTA HISAHARUKAWASHIMA MASAHIRO
    • C09D5/23C09D127/04C09D127/06C09D175/00C09D175/04G11B5/702
    • PURPOSE:To provide reduction in curing and drying time, improvement in dispersibility of magnetic powder, etc. and to obtain an excellent magnetic recording medium by forming a magnetic layer by a coating method using a binder contg. polyisocyanate having content of allophanate bond at a specific value or above and an active H-contg. compd. CONSTITUTION:The urethanation reaction is effected in the state of the excess isocyanate group with respect to OH of polyol and after the end of urethanation reaction allophanation reaction is further effected or the allophanation reaction is effected simultaneously with the urethanation reaction in the stage of bringing arom. or aliphat. diisocyanate into reaction with polyol. The polyisocyanate satisfying the condition expressed by the formula (X is allophanate bond content %, U is the number of urethane bond, A is the number of allophanate bond) is thus obtd. A binder contg. such isocyanate and an active H-contg. compd., for example, a vinyl chloride/vinyl acetate/vinyl alcohol compd., etc. is used. Said binder yields a coating liquid having good coatability even if the amt. of the solvent to be used is small. The magnetic layer having good surface smoothness is thus formed.