Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1985-02-07

1987-02-17

Robinson, Ellis P.

Stock material or miscellaneous articles

Structurally defined web or sheet

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

360134, 360135, 360136, 427128, 427131, 428143, 428147, 428323, 428329, 428522, 428521, 428523, 428493, 4284259, 428480, 428694, 428900, G11B 572

Patent

active

046439340

ABSTRACT:
In a magnetic recording medium having a magnetic recording coat formed on one side of a base and a back coat on the other side, the back coat consists of a dispersion in a binder of an inorgainc pigment powder having an average particle diameter of 0.2 to 0.5 .mu.m and a Mohs hardness of not greater than 6. The binder consists of a specific copolymer, a rubber-like binder, and a polyisocyanate ingredient. The copolymer consists of vinyl chloride, a vinyl alkyl carboxylate, a monomer copolymerizable with vinyl chloride, and a saponified vinyl alkyl carboxylate and has an OH/CH absorption ratio as determined from its infrared absorption spectrum in the range of 0.2 to 0.7.

REFERENCES:
patent: 4328933 (1982-05-01), Steel
patent: 4414270 (1983-11-01), Miyoshi
patent: 4419406 (1983-12-01), Isobe
patent: 4452863 (1984-06-01), Takizawa
patent: 4460653 (1984-07-01), Azegami
patent: 4567083 (1986-01-01), Arioka

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