Stock material or miscellaneous articles – Structurally defined web or sheet – Continuous and nonuniform or irregular surface on layer or...
Patent
1998-07-06
2000-03-14
Resan, Stevan A.
Stock material or miscellaneous articles
Structurally defined web or sheet
Continuous and nonuniform or irregular surface on layer or...
428323, 428329, 428694BS, 428900, G11B 568
Patent
active
060370378
ABSTRACT:
The present invention provides a thin multilayer magnetic recording medium having improved electromagnetic conversion property and durability, comprising coating layers of a lower non-magnetic layer and an upper magnetic layer. The non-magnetic layer of this magnetic recording medium comprises a non-magnetic needle body having an average major axis length of 0.25 to 1.0 .mu.m and an average minor axis length of 0.005 to 0.0151 .mu.m, a first binding resin having a glass transition temperature (Tg.sub.1) of 30 to 50.degree. C., and fatty acid ester. The content of the first binding resin is 15 to 30 wt % with respect to the non-magnetic needle body. The content of the fatty acid ester is 2 to 15 wt % with respect to the first binding resin. The magnetic layer having a dry thickness of 0.5 .mu.m or less comprises ferromagnetic powder and a second binding resin having a glass transition temperature (Tg.sub.2) of 40 to 70.degree. C. Tg.sub.1 is at least 5.degree. C. lower than Tg.sub.2, and the entire thickness comprising the layers and the film is 12 .mu.m or less.
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patent: 5756148 (1998-05-01), Ejiri et al.
patent: 5763046 (1998-06-01), Ejiri et al.
patent: 5895707 (1999-04-01), Miura
Echigo Fumio
Fuchi Tetuo
Haneda Takumi
Ito Hirofumi
Kobata Kiyoshi
Matsushita Electric - Industrial Co., Ltd.
Resan Stevan A.
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