Magnetic recording medium having a backcoat composition with low

Details Magnetic recording medium having a backcoat composition with low Magnetic recording medium having a backcoat composition with low

1996-11-13

1998-07-28

Resan, Stevan A.

Stock material or miscellaneous articles

Composite

Of polyamidoester

428694BB, 428900, G11B 570

Patent

active

057860939

ABSTRACT:
A magnetic recording medium wherein a magnetic metal film has been formed on one surface of a non-magnetic substrate, and a back coat resulting from a non-magnetic pigment dispersed among a binder has been formed on the other, or reverse to the side upon which the magnetic film has been formed, characterized by that each of the chloride and sulfate ion contents of the back coat, according to the analysis by ion chromatography of its pure water extract, is not more than 5 ppm, and that the binder acting as a constituent of the back coat contains at least polycarbonate urethane.

REFERENCES:
patent: 4604296 (1986-08-01), Aonuma et al.
patent: 4629646 (1986-12-01), Ide et al.
patent: 4801500 (1989-01-01), Yasunaga et al.
patent: 5008147 (1991-04-01), Ryoke et al.
patent: 5089331 (1992-02-01), Ryoke et al.

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