Sughrue, Mion, Zinn, Macpeak, and Seas
Magnetic recording medium of continuous form
 An improvement of a magnetic recording medium in the continuous form comprising a nonmagnetic support, a magnetic recording layer provided on one surface of the support, and a back layer provided on the other surface of the support comprising a binder and nonmagnetic particles dispersed therein. The improvement resides in that the binder of the back layer mainly contains: PA0 a polyurethane resin containing a repeating unit having at least one polar group selected from the group consisting of --SO.sub.3 M, --OSO.sub.3 M, --COOM and --PO(PM').sub.2, wherein M is hydrogen or an alkali metal atom, and M' is hydrogen, an alkali metal atom or a lower hydrocarbon group; and PA0 a vinyl chloride copolymer containing a repeating unit having at least one polar group selected from the group consisting of --SO.sub.3 M, --OSO.sub.3 M, --COOM and --PO(OM').sub.2, wherein M and M' have the same meanings as defined above. 
Fuji Photo Film Co., Ltd.
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inventional additional inventional additional inventional additional additional additional
Masatoshi Yutaka Takahito
Takahashi Kakuishi Miyoshi