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Chromium Dioxide Magnetic Media

IP.com Disclosure Number: IPCOM000048906D
Original Publication Date: 1982-Apr-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Haines, RS: AUTHOR

Abstract

When particulate acicular CrO(2) particles are milled in a solution of a preformed urethane polymer, the urethane bonds to the CrO(2) particles to both stabilize the particle's magnetic properties as a function of humidity and to render the particles less abrasive.

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Chromium Dioxide Magnetic Media

When particulate acicular CrO(2) particles are milled in a solution of a preformed urethane polymer, the urethane bonds to the CrO(2) particles to both stabilize the particle's magnetic properties as a function of humidity and to render the particles less abrasive.

When such an ink is used to coat a non-magnetic substrate, such as FEP resin film, in forming a magnetic recording medium, e strong insoluble bond is created between the surface of the CrO(2) particles and the medium's polymeric binder.

This ink does not require a crosslinking agent, and yet it can be cured at room temperature, although 60 degrees C is preferred. Stabilized or unstabilized CrO(2) particles can be used; however, unstabilized particles are preferred. MORTHANE* brand or ESTANE** 5701 brand urethane can be used. * Trademark of Morton Chemical Company, division of Morton Norwich Products, Inc. ** Trademark of B. F. Goodrich Chemical Co.

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