Imation Corporation

Minnesota Mining and Manufacturing Company

Norman E Rustad

Deral T Mosbey

Edward R Harrell

A magnetic recording medium, comprising a magnetic coating provided on a nonmagnetizable substrate, wherein the magnetic coating comprises a magnetic pigment dispersed in a polymeric binder, said binder being a matrix of cured components which comprise a film-forming, unhindered, aromatic polyisocyanate crosslinking agent and a polymer component.

Crosslinking agent composition comprising a diisocyanate, a diidocyanate

Magnetic recording media incorporating a polyisocyanate crosslinking

Flexible magnetic recording media and stable-fluid, reactive dispersions of polymeric binder materials and particulate solids (either magnetic or non-magnetic) useful in preparing flexible or rigid magnetic recording media are provided. The use of a crosslinkable dispersing polymer comprised of a vinyl aromatic monomer and an ethylenically unsaturated monomer having hydroxyl functionality allows for magnetic media having both an excellent dispersion of finely divided magnetic particles, which improves the magnetic properties of the media, and an excellent set of mechanical characteristics, such as flexural modulus and tensile strength, of the magnetic media. The dispersing copolymer is used in an amount of at least about 5% by weight of the crosslinked binder mixture of which the crosslinkable dispersing polymer is a part.

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Shoreview, MN, United States of America

Norman E Rustad