Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1984-04-09

1987-10-13

Robinson, Ellis P.

Stock material or miscellaneous articles

Composite

Of polyamidoester

252 6254, 427 44, 427128, 427130, 427131, 428522, 428694, 428695, 428900, G11B 5702

Patent

active

046998446

ABSTRACT:
A magnetic recording medium comprised of a support base having a magnetic recording provided thereon is disclosed. The recording layer is comprised of ferromagnetic particles dispersed in a binder. The binder includes (1) a vinyl chloride-vinyl alkanoate type copolymer containing --CO.sub.2 H group of 5.times.10.sup.-5 to 1.7.times.10.sup.-3 equivalent per g of the polymer, (2) urethane acrylate having a molecular weight in the range of from 20,000 to 300,000, and (3) a compound having at least two (meth)acryloyl groups in the molecule and having a molecular weight of 600 or less. The magnetic recording layer is irradiated with electron beams in order to harden the binder. The resulting medium has excellent electromagnetic properties and the magnetic coating composition prepared for making the magnetic recording layer has excellent stability during storage.

REFERENCES:
patent: 4004997 (1977-01-01), Tsukamoto
patent: 4407853 (1983-10-01), Okita
patent: 4419406 (1983-12-01), Isoke
patent: 4428974 (1984-01-01), Okita
patent: 4448848 (1984-05-01), Okita

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