Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1997-05-07

1999-10-26

Resan, Stevan A.

Stock material or miscellaneous articles

Composite

Of polyamidoester

428694BU, 428694BL, 428694BM, 428694BS, 428900, G11B 5702

Patent

active

059725150

ABSTRACT:
The present invention provides a magnetic recording medium, which has high dispersion property, high breaking extension and excellent running durability. The magnetic recording medium comprises a magnetic layer having at least one layer of ferromagnetic powder and a binder, said magnetic layer being placed on a non-magnetic support member, whereby said binder contains at least a polyurethane resin (A) and a polyether polyester urethane resin (B), said polyurethane resin (A) contains a polyol with molecular weight of 500 to 5,000 by 0 to 50 weight %, said polyol being obtained by adding alkylene oxide to a diol having cyclic structure, said polyurethane resin (A) also contains a diol having cyclic structure and/or a short-chain diol with molecular weight of 200 to 500 by 15 to 50 weight %, said short-chain diol being obtained by adding alkylene oxide to diol, said polyurethane resin contains ether groups obtained from said diol and said polyol by 1.0 to 5.0 mmol/g to the total quantity of the polyurethane resin.

REFERENCES:
patent: 5451464 (1995-09-01), Abe et al.
patent: 5578376 (1996-11-01), Hashimoto et al.
patent: 5702821 (1997-12-01), Murayama et al.

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