Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1989-07-31

1992-02-18

Thibodeau, Paul J.

Stock material or miscellaneous articles

Composite

Of polyamidoester

428694, 428900, G11B 2300

Patent

active

050893440

ABSTRACT:
A magnetic recording medium whose magnetic layer formed on a base comprises a magnetic powder and a binder which contains a tertiary amine and uses 1,4-cyclohexanedimethanol as a chain extender. The magnetic powder is preferably of CrO.sub.2. The medium is made by mixing and dispersing the magnetic powder in a binder which consists of a reaction product of (A) a polyester which is a reaction product of a diol selected from among ethylene glycol, propylene glycol, 1,3-butanediol, 1,4-butanediol, 1,5-pentadiol, and 1,6-hexanediol, and adipic acid, (B) a chain extender consisting of 1,4-cyclohexanedimethanol, (C) an aliphatic or aromatic diisocyanate in an amount substantially equal to the combined molar amount of the polyester and the chain extender, and (D) a tertiary amine, and applying the resulting magnetic coating material to a base.

REFERENCES:
patent: 4284750 (1981-08-01), Amirsakis
patent: 4286022 (1981-08-01), Vermillion
patent: 4525424 (1985-06-01), Bradshaw
patent: 4568611 (1986-02-01), Amirsakis
patent: 4568612 (1986-02-01), Lehner et al.
patent: 4711819 (1987-12-01), Hanai et al.
patent: 4788103 (1988-11-01), Okita et al.
patent: 4869965 (1989-09-01), Gerum et al.

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