Magnetic recording media

Details Magnetic recording media Magnetic recording media

1981-12-24

1983-01-11

Pianalto, Bernard D.

Stock material or miscellaneous articles

Composite

Of epoxy ether

4284259, 428482, 428522, 428532, 428694, 428900, H01F 1002

Patent

active

043682383

ABSTRACT:
The magnetic recording medium contains as a binder a thermoplastic polyurethane resin having a molecular weight larger than about 5,000 and produced by the polyaddition of a long chain diol (A) having a molecular weight ranging from about 500 to 3,000, an organic diisocyanate (C) and a short chain triol (D) having a molecular weight lower than about 500 and specified structures and, as desired, a short chain diol (B) having a molecular weight ranging from about 50 to 500, in specified ratios. The binder may contain a nitrocellulose, a vinyl chloride resin, a polyvinyl butyral, a bisphenol A type polyether or a vinyl chloride-hydroxy carboxylate copolymer as a binder component.
The binder provides particularly enhanced heat resistance and solvent resistance with improved dispersibility of a pigment or the like and other resins and favorable compatibility with a solvent or the like.

REFERENCES:
patent: 4320171 (1982-03-01), Motz et al.

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