Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Patent
1996-03-18
1998-01-27
Resan, Stevan A.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
428323, 428336, 428694BS, 428900, G11B 0570
Patent
active
057120285
ABSTRACT:
A magnetic recording medium includes a flexible substrate, an undercoating layer formed on the substrate, and a magnetic layer formed on the undercoating layer. The undercoating layer contains a binder and nonmagnetic particles having an average particle size in the range of 0.01 to 0.20 .mu.m. The content of the nonmagnetic particles in the undercoating layer is in the range of 40 to 85% by weight. The magnetic layer contains ferromagnetic powder, a binder and an abrasive having an average particle size in the range of 0.10 to 0.40 .mu.m. The magnetic layer has a thickness in the range of 0.10 to 0.30 .mu.m and contains the abrasive in the range of 1 to 5 parts by weight relative to 100 parts by weight of the ferromagnetic powder. With this arrangement, the magnetic recording medium is capable of high density recording and excellent in electromagnetic transducer property and durability.
REFERENCES:
patent: 5405679 (1995-04-01), Isobe
patent: 5455093 (1995-10-01), Kawamata et al.
Patent Abstracts of Japan, 60-171631, Sep. 5, 1985, English Abstract.
Patent Abstracts of Japan, 62-222247, Sep. 30, 1987, English Abstract.
Patent Abstracts of Japan, 63-193325, Aug. 10, 1988, English Abstract.
Patent Abstracts of Japan, 3-102633, Apr. 30, 1991, English Abstract.
Patent Abstracts of Japan, 5-197946, Aug. 6, 1993, English Abstract.
Saitoh Akira
Seki Akihiko
Tsuchida Satoru
Resan Stevan A.
TDK Corporation
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