Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1984-10-01

1986-09-16

Robinson, Ellis P.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

360134, 360135, 360136, 427128, 427131, 428408, 4284231, 4284237, 4284255, 4284259, 428480, 428694, 428900, G11B 572

Patent

active

046122443

ABSTRACT:
A magnetic recording medium is disclosed, in which a magnetic layer is formed on one surface of the non-magnetizable substrate and a back coating layer consisting essentially of a binder and a non-magnetizable pigment is formed on the other surface of the substrate. In the back coating layer, more than 80 weight percent of the binder is a polyurethane resin or a polyester resin having hydrophilic polar groups. The back coating layer also contains carbon black for preventing electrostatic charging and pigments with Mohs hardness higher than 5 for improving durability. The carbon black to the pigments weight ratio is set to be in the range of 95:5 to 60:40.

REFERENCES:
patent: 4152485 (1979-05-01), Mizumura
patent: 4328935 (1982-05-01), Steel
patent: 4419406 (1983-12-01), Isobe
patent: 4420531 (1983-12-01), Tokuda
patent: 4529661 (1985-07-01), Ninomiya

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