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US 5,489,466 AGranted
Magnetic recording medium comprising a lower nonmagnetic layer containing a surface coated inorganic powder and an upper magetic layer
AssigneeFuji Photo Film Co., Ltd.
InventorsHiroo Inaba, Kiyoma Ejiri, Kouichi Masaki, Takeshi Harasawa
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Abstract
Disclosed is a magnetic recording medium comprising a nonmagnetic support, a lower nonmagnetic layer and an upper magnetic layer. The lower nonmagnetic layer is coated on the support, comprises an inorganic nonmagnetic powder dispersed in a binder, and is surface-coated with an inorganic oxide. The upper magnetic layer has a dry thickness of 1.0 micrometers or less and comprises a dispersion of a ferromagnetic powder in a binder. The upper magnetic layer is coated onto the lower nonmagnetic layer.
Claims14
A magnetic recording medium, comprising:
- (1) a nonmagnetic support;
- (2) a lower nonmagnetic layer coated on the support, which comprises an inorganic nonmagnetic powder which powder is dispersed in a binder and which powder is surface-coated with an inorganic oxide;
- and
- (3) an upper magnetic layer coated on the lower nonmagnetic layer and comprising a dispersion of a ferromagnetic powder in a binder, wherein the lower nonmagnetic layer has a thickness of 0.5 .mu.m to 10 .mu.m after drying and the upper magnetic layer has a thickness of 1.0 .mu.m or less after drying.
1 more element
Dependencies are inferred from the claim text.