Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1976-04-01

1978-01-24

Lesmes, George F.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

252 6254, 360134, 428330, 427128, 428328, 428329, 428413, 428539, 428500, 260831, 260834, 260837R, H01F 1002

Patent

active

040705226

ABSTRACT:
A magnetic recording medium having finely divided magnetic metal oxide particles dispersed in a thermosetting resin binder and a thickness of no greater than 5 microns is provided. The thermosetting resin binder comprises: (a) 30 to 95 wt.% of a copolymer of 25 to 65 wt.% of alkyl acrylate or alkyl methacrylate, 3 to 30 wt.% of N-methylolacrylamide or N-alkoxymethylacrylamide and 10 to 60 wt.% of styrene or a methyl styrene, (b) 5 to 70 wt.% of an epoxy resin predominantly comprised of a condensation product of bisphenol A and epihalohydrin, and; (c) 0 to 50 wt.% of phenolic resin or amino resin. The magnetic recording medium is superior in abrasion resistance, solvent resistance and dispersion of the magnetic material therein, and possesses improved recording density.

REFERENCES:
patent: 2941901 (1960-06-01), Prill et al.
patent: 3459698 (1969-08-01), Mantell et al.
patent: 3630910 (1971-12-01), Akashi et al.
patent: 3687725 (1972-08-01), Hartmann et al.
patent: 3740266 (1973-06-01), Akashi et al.
patent: 3781211 (1973-12-01), Lohoff
patent: 3821025 (1974-06-01), Akashi et al.

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