Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including a second component containing structurally defined...
Patent
1988-07-01
1990-08-07
Thibodeau, Paul J.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Including a second component containing structurally defined...
427131, 428329, 428408, 428336, 428694, 428900, G11B 2300
Patent
active
049467409
ABSTRACT:
A magnetic recording medium is described, comprising a non-magnetic support having thereon a first magnetic layer comprising at least about 1.0 part by weight of carbon black having an average primary particle diameter of from about 20 to 80 m.mu., per 100 parts by weight of magnetic particles contained in the first magnetic layer; and on the first magnetic layer, a second magnetic layer containing from about 0.1 to less than 1.0 part by weight of carbon black having an average primary particle diameter of from about 20 to 150 m.mu., per 100 parts by weight of magnetic particles contained in the second magnetic layer. The medium has excellent electromagnetic characteristics, running durability and heat resistance.
REFERENCES:
patent: 4259392 (1981-03-01), Suzuki
patent: 4511617 (1985-04-01), Hideyama et al.
patent: 4624883 (1986-11-01), Yamaguchi et al.
patent: 4624894 (1986-11-01), Kishimoto
patent: 4643941 (1987-02-01), Miyoshi et al.
Mizuno Chiaki
Ogawa Hiroshi
Ono Toshio
Saito Shinji
Fuji Photo Film Co. , Ltd.
Thibodeau Paul J.
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