Magnetic recording medium

Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Physical dimension specified

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360134, 360135, 360136, 252 6254, 427128, 4284231, 4284237, 428480, 428522, 428694, 428900, G11B 570

Patent

active

045031207

ABSTRACT:
A magnetic recording medium which comprises a non-magnetic support having thereon a magnetic recording layer containing a ferromagnetic fine powder and a binder as main components is disclosed. The magnetic recording layer containing as the binder (1) a vinyl chloride-vinyl acetate-maleic acid copolymer which has a mean polymerization degree of about 300 to about 400 and a maleic acid fraction of about 0.6 to about 1.5 wt %, (2) a polyurethane resin which has a number average molecular weight of 40,000 to 100,000 and is prepared from (i) a mixture of polyneopentyladipate having a mean molecular weight of 500 to 2,500 and polybutyleneadipate having a mean molecular weight of 500 to 2,500 with a mixing ratio of the former to the latter of from 2/8 to 9/1 by weight and (ii) diphenylmethane diisocyanate, and optionally (3) a low molecular weight polyisocyanate compound.

REFERENCES:
patent: 4135016 (1979-01-01), Ogama et al.
patent: 4284750 (1981-08-01), Amirsabis
patent: 4352859 (1982-10-01), Yoda et al.
patent: 4400435 (1983-08-01), Yoda et al.
patent: 4431700 (1984-02-01), Yamada et al.
patent: 4431712 (1984-02-01), Matsufuji et al.
patent: 4454202 (1984-06-01), Komine et al.

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