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Particulate Magnetic Coatings

IP.com Disclosure Number: IPCOM000053055D
Original Publication Date: 1981-Aug-01
Included in the Prior Art Database: 2005-Feb-12
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Haines, RS: AUTHOR

Abstract

When preparing a magnetic ink for use in coating a non-magnetic substrate to form magnetic recording media, CrO(2) particles first mixed with an isocyanate crosslinking agent, such as the MONDUR* MRS brand. During this mixing process, the isocyanate functions as a dispersing agent, and also stabilizes the CrO(2) particles against change in magnetic property as a function of humidity. After this mixing step, urethane polymer is added as the final constituent of the ink. The ink is then coated on the substrate.

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Particulate Magnetic Coatings

When preparing a magnetic ink for use in coating a non-magnetic substrate to form magnetic recording media, CrO(2) particles first mixed with an isocyanate crosslinking agent, such as the MONDUR* MRS brand. During this mixing process, the isocyanate functions as a dispersing agent, and also stabilizes the CrO(2) particles against change in magnetic property as a function of humidity. After this mixing step, urethane polymer is added as the final constituent of the ink. The ink is then coated on the substrate.

The use of unstabilizer CrO(2) particles is preferred, but not essential. * Trademark of Mobay Chemical Co.

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