Stock material or miscellaneous articles – Structurally defined web or sheet – Continuous and nonuniform or irregular surface on layer or...
Patent
1984-06-04
1988-05-17
Thibodeau, Paul J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Continuous and nonuniform or irregular surface on layer or...
427131, 428323, 428336, 428408, 428694, 428900, G11B 570
Patent
active
047450177
ABSTRACT:
A magnetic recording medium which comprises a non-magnetic support having on the surface side thereof a magnetic recording layer and on the opposite side thereof a backing layer is disclosed. The backing layer contains carbon black and a binder and has a thickness of 2 .mu.m or less. The carbon black is composed of fine-grained carbon black having a mean grain size of 10 to 30 m.mu. and coarse-grained carbon black having a mean grain size of 100 to 150 m.mu.. In the backing layer the ratio of the content of carbon black to the binder ranges from 1:0.5 to 1:3.5 by weight.
REFERENCES:
patent: 4135031 (1979-01-01), Akashi et al.
patent: 4414270 (1983-11-01), Miyoshi et al.
patent: 4474843 (1984-10-01), Miyoshi et al.
patent: 4598014 (1986-07-01), Miyoshi et al.
Fujiyama Masaaki
Masuyama Kenichi
Miyoshi Takahito
Okutu Toshimitu
Utumi Masahiro
Fuji Photo Film Co. , Ltd.
Thibodeau Paul J.
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