Flexible magnetic recording disk and method for preparing the sa

Details Flexible magnetic recording disk and method for preparing the sa Flexible magnetic recording disk and method for preparing the sa

1993-08-19

1995-02-14

Resan, Stevan A.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428212, 428213, 428323, 428336, 428694BN, 428694BS, 428900, G11B 500

Patent

active

053894189

ABSTRACT:
There is disclosed a flexible magnetic recording disk which is suitable as a high capacity magnetic disk for data recording and has an excellent durability. The flexible magnetic recording disk comprises a non-magnetic support having thereon a non-magnetic layer comprising a non-magnetic powder and a binder resin, and a magnetic layer comprising a ferromagnetic powder and a binder resin, in this order, wherein the magnetic layer has a thickness of 1 .mu.m or less, which is 1/2 or less of the thickness of the non-magnetic layer; and the magnetic layer further contains the abrasive particles which comprise a first abrasive particles having a Mohs' hardness of 6 or more and an average particle size of 0.8 to 1.4 times as large as the average particle size of the magnetic powder and a second abrasive particles having a Mohs' hardness of 6 or more and an average particle size of 2 to 4 times as large as the average particle size of the ferromagnetic powder.

REFERENCES:
patent: 4721646 (1988-01-01), Iechika et al.
patent: 5001006 (1991-03-01), Saito et al.
patent: 5057364 (1991-10-01), Saito et al.
patent: 5122414 (1992-06-01), Shimizu et al.

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