Magnetic recording medium comprising an underlayer of non magnet

Details Magnetic recording medium comprising an underlayer of non magnet Magnetic recording medium comprising an underlayer of non magnet

1993-02-18

1994-10-25

Resan, Stevan A.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428336, 428694BS, 428694BH, 428900, G11B 0500

Patent

active

053587774

ABSTRACT:
A magnetic recording medium comprising (A) a non-magnetic support; (B) a non-magnetic layer comprising mainly a non-magnetic powder and a binder resin; and (C) a magnetic layer comprising mainly a ferromagnetic powder and a binder resin, wherein said non-magnetic layer is coated on said non-magnetic support; and said magnetic layer is coated over the previously formed non-magnetic layer while the previously formed non-magnetic layer is still wet; the thickness of the magnetic layer is 0.6 .mu.m or less; the Young's Modulus of the magnetic layer is from 50% to 95% of the Young's Modulus of the non-magnetic layer, and the glass transition temperature of the magnetic layer is lower than that of the non-magnetic layer. The magnetic recording medium has good electromagnetic characteristics and excellent running stability and running durability. It is suitable as a disc medium for high-density recording at a shortest recording wavelength of 1.5 .mu.m or less, displaying excellent overwriting characteristic in high-density recording. The running reliability of the magnetic recording medium is good.

REFERENCES:
patent: 4863793 (1989-09-01), Ogawa et al.
patent: 4874633 (1989-10-01), Komatsu et al.
patent: 4952444 (1990-08-01), Kawamata et al.
patent: 4963433 (1990-10-01), Ogawa et al.
patent: 5066534 (1991-11-01), Goto et al.

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