Magnetic recording medium

Stock material or miscellaneous articles – Structurally defined web or sheet – Continuous and nonuniform or irregular surface on layer or...

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

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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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