Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1996-08-29

1998-05-05

Rodee, Christopher D.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

428336, 428694BG, 428694BU, 428694BL, 428694BS, 428900, G11B 5702

Patent

active

057471576

ABSTRACT:
The invention relates to a binder which improves the dispersibility of ferromagnetic powders and makes it possible to achieve a magnetic recording medium excellent in operation durability and storability, and a magnetic recording medium using such a binder. The invention provides a magnetic recording medium including a non-magnetic support substrate and a magnetic layer formed on said support substrate, said magnetic layer comprising a dispersion of ferromagnetic fine powders in a binder, wherein said binder comprises a polyurethane resin that is a reaction product obtained by using a polyol and an organic diisocyanate as main starting materials, said polyurethane resin containing as components of said polyol 15 to 40% by weight of a short-chain diol component having a cyclic structure, and 10 to 50% by weight of a long-chain polyether polyol component, and further including a polar group-containing long-chain polyol component having a molecular weight of 500 to 5,000.

REFERENCES:
patent: 5413862 (1995-05-01), Murata et al.
patent: 5458948 (1995-10-01), Yanagita et al.

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