Magnetic recording medium and process for preparing the same

Details Magnetic recording medium and process for preparing the same Magnetic recording medium and process for preparing the same

1993-05-11

1995-07-18

Resan, Stevan A.

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

428212, 428332, 4284246, 4284259, 428522, 428694BU, 428694BG, 428694BR, 428694BP, 428900, 427130, 427557, G11B 500

Patent

active

054339898

ABSTRACT:
Disclosed is a magnetic recording medium comprising, a non-magnetic support having thereon (i) a lower non-magnetic layer comprising a non-magnetic powder and a binder, and (ii) an upper magnetic layer comprising a ferromagnetic powder and a binder, wherein an extract, obtained by extracting with tetrahydrofuran the binder present in the area between the outer surface of the upper magnetic layer and a position 0.1 .mu.m in depth from the outer surface, has a weight-average molecular weight of 15,000 or more, and wherein the reaction ratio of the curing agent reacted with the binder in the area between the outer surface of the upper magnetic layer and a position 0.1 .mu.m in depth from the outer surface is at least 1.3 times as much as the reaction ratio of the curing agent reacted with the binder containing a polyurethane in the lower nonmagnetic and upper magnetic layers as a whole. Also disclosed is a process for making this magnetic recording medium.

REFERENCES:
patent: 3366505 (1968-01-01), Bisschops et al.
patent: 4711819 (1987-12-01), Hanai et al.
patent: 4863793 (1989-09-01), Ogawa et al.
patent: 4911951 (1990-03-01), Ogawa et al.
patent: 5051319 (1991-09-01), Kuse et al.

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