Magnetic recording medium
AssigneeFuji Photo Film Co., Ltd.
InventorsYuichiro Murayama, Katsuhiko Meguro, Hiroshi Hashimoto
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Abstract
A magnetic recording medium, comprising at least one magnetic layer, said magnetic layer containing ferromagnetic powder and a binder and placed on a nonmagnetic support member, whereby said binder contains a polyurethane resin, using a diol compound having a cyclic structure and a long-chain alkyl chain, and a polyol with weight average molecular weight (Mw) of 400-5000 and having at least one type of polar group selected from the following groups: —SO3M, —SO4M, —PO3M2, —PO4M2, —NHSO3M, >NSO3M, and —COOM where M represents hydrogen, at least one type of alkali metal of potassium, sodium and lithium, and an organic amine containing at least one type of alkylamine and alkanol.
Claims4
A magnetic recording medium, comprising at least one magnetic layer, said magnetic layer containing ferromagnetic powder and a binder and placed on a nonmagnetic support member, whereby said binder contains a polyurethane resin, using a diol compound having a cyclic structure and a long-chain alkyl chain, and a polyol with weight average molecular weight (Mw) of 400-5000 and having at least one of polar group selected from the following groups:
- —SO3M, —SO4M, —PO3M2, —PO4M2, —NHSO3M, >NSO3M, and —COOM
- where M represents hydrogen, at least one type of alkali metal of potassium, sodium or lithium, and an organic amine containing at least one type of alkylamine or alkanol.
Dependencies are inferred from the claim text.