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US 4,391,851 AGranted
Process for producing a magnetic recording medium
AssigneeFuji Photo Film Co., Ltd.
InventorsYasuyuki Yamada, Goro Akashi, Nobuo Tsuji, Yoshito Mukaida, Masaaki Fujiyama
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Abstract
A process for producing a magnetic recording medium is disclosed. The process involves coating a non-magnetic base with magnetic coating solution containing fine ferromagnetic particles and a binder comprising nitrocellulose, polyol and an isocyanate having at least two isocyanato groups. In the process, the web having 0.3 to 3 wt % of the residual solvent in the magnetic layer is calendered, and the calendered web is then dried thoroughly.
Claims21
A process for producing a magnetic recording medium, comprising the steps of:
- providing a non-magnetic support base;
- coating a surface of said base with a magnetic coating solution comprising:
- fine ferromagnetic particles;
- a binder comprising nitrocellulose, polyol and an isocyanate having at least two isocyanato groups;
- and
- a solvent;
- evaporating said solvent until said magnetic layer coated on said base is comprised of 0.3 to 3 wt% of the residual solvent;
- calendering said base;
- and
- drying the calendered base.
7 more elements
Dependencies are inferred from the claim text.