Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1986-01-28

1989-05-16

Thibodeau, Paul J.

Stock material or miscellaneous articles

Composite

Of polyamidoester

427128, 428694, 428900, G11B 570

Patent

active

048309230

ABSTRACT:
A magnetic recording medium comprising a substrate and a magnetic layer coated on the substrate which comprises a magnetic powder and a binder resin, wherein said binder resin comprises a modified polymer selected from the group consisting of a polymer having a backbone chain comprising a vinyl chloride/vinyl acetate/vinyl alcohol terpolymer and a polymer having a backbone chain comprising polyurethane to both of which a phosphoric acid group of the formula: ##STR1## wherein A is a hydrogen atom, an alkali metal atom or a hydrocarbon group, and n is 0 or 1 is bonded, the magnetic layer having improved surface smoothness, improved durability and excellent electromagnetic conversion characteristics particularly in the short wavelength range.

REFERENCES:
patent: 4521486 (1985-06-01), Ninomiya
patent: 4526837 (1985-07-01), Ohtsuki
patent: 4529661 (1985-07-01), Ninomiya
patent: 4571364 (1986-02-01), Kasuga
patent: 4600521 (1986-07-01), Nakamura
patent: 4634633 (1987-01-01), Ninomiya et al.
patent: 4637959 (1987-01-01), Ninomiya et al.
patent: 4707411 (1987-11-01), Nakayama
patent: 4731292 (1988-03-01), Susaki
patent: 4743501 (1988-05-01), Eguchi

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