Magnetic recording medium having a backcoat layer containing car

Details Magnetic recording medium having a backcoat layer containing car Magnetic recording medium having a backcoat layer containing car

1995-09-05

1997-07-15

Resan, Stevan A.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428323, 428324, 428328, 428329, 428332, 428336, 428408, 428694BB, 428900, G11B 568

Patent

active

056481500

ABSTRACT:
In the magnetic recording medium with a total thickness of 12.5 .mu.m, a magnetic layer is formed on one surface of a non-magnetic supporter, and a back coat layer with a thickness of 1.0 .mu.m and composed of solid powder and a binder is formed on the other surface of the same non-magnetic supporter. The solid powder contains platelet inorganic powder and carbon black powder mixed in such a mix rate that the carbon black powder is between 5 and 20 parks by weight, when the platelet inorganic powder is 100 parts by weight. In spite of the fact that the total thickness of the magnetic recording medium is as thin as 12.5 .mu.m, a sufficient mechanical strength and a sufficient travel stability can be both obtained, while preventing tape damage such as breakage, wrinkles, etc.

REFERENCES:
patent: 4578311 (1986-03-01), Ishikuro et al.
patent: 5075180 (1991-12-01), Ishikuro et al.
patent: 5501896 (1996-03-01), Ueyama et al.
Database WPI, Week 9247, Derwent Publications Ltd., London, GB; & JP-A-04 285 725 (Matsushita Elec Ind), Oct. 9, 1992.

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