Magnetic tape containing abrasives

Details Magnetic tape containing abrasives Magnetic tape containing abrasives

1991-06-24

1993-10-26

Thibodeau, Paul J.

Stock material or miscellaneous articles

Composite

Of inorganic material

428323, 428328, 428329, 428336, 428800, G11B 566, B32B 516

Patent

active

052564975

ABSTRACT:
It has been found that a magnetic tape which may be used in particular for video recording and which has excellent abrasive and cleaning properties for all those parts of the cassette or rather the recording and play-back unit which come into contact with the magnetic layer can be obtained by addition of a non-magnetic powder having a Mohs' hardness of at least 9 and a primary particle size of 0.3 to 2 .mu.m to the magnetic pigment, which has a BET surface of at least 26 m.sup.2 /g, in the magnetic dispersion, the magnetic layer of the magnetic tape having an Ra value of less than 0.02 .mu.m. The best results were obtained with cubic Al.sub.2 O.sub.3 particles added in a quantity of 1.1 to 4.4% by weight, based on the magnetic pigment.

REFERENCES:
patent: 4138229 (1979-02-01), Tadokoro et al.
patent: 4379800 (1983-04-01), Sato
patent: 4392911 (1983-08-01), Akashi et al.
patent: 4716076 (1987-12-01), Morioka et al.
patent: 4806452 (1989-02-01), Hoffmann et al.
patent: 4837083 (1989-06-01), Kuroda et al.
patent: 4847182 (1989-07-01), Worns et al.
patent: 4913959 (1990-04-01), Miyake et al.
patent: 5037695 (1991-08-01), Yamada et al.
U.S. Ser. No. 07/356,933 (corresponds to DE 29 08 764).
IEEE Transactions on Magnetics, vol. Mag--23, No. 1, Jan. 1987, pp. 103-105.

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