Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including a second component containing structurally defined...
Patent
1990-12-04
1992-02-18
Thibodeau, Paul J.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Including a second component containing structurally defined...
428336, 428408, 428694, 428900, G11B 2300
Patent
active
050893335
ABSTRACT:
A magnetic recording medium is disclosed, which has excellent electro-magnetic conversion characteristics and is improved in drop-out. The magnetic recording medium comprises a non-magnetic support and a plurality of magnetic layers provided on the support, and the magnetic layer being provided farthest from said support among these magnetic layers comprises a magnetic powder and a carbon black in an amount of not more than 1 part per 100 parts by weight of said magnetic powder; and another magnetic layer comprising a magnetic powder has a thickness of not more than 2.5 .mu.m, and 900 nm light-transmittance of said magnetic medium is not more than 0.1%.
REFERENCES:
patent: 4851289 (1989-07-01), Ogawa et al.
patent: 4946740 (1990-07-01), Ono et al.
patent: 4980230 (1990-12-01), Saito et al.
patent: 4992330 (1991-02-01), Kawahara et al.
Derwent Abstracts, week 86-19, abstract No. 86-122070/19, JPA-61-61230.
Patent Abstracts of Japan, vol. 13, No. 75 (p. 831)(3423) 2/21/89, JPA-63-259826; 10/26/88.
Kawahara Setsuko
Koyama Noboru
Nakajima Noboru
Nakano Yasushi
Bierman Jordan B.
Konica Corporation
Thibodeau Paul J.
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