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Treatment of Chromium Dioxide Particles

IP.com Disclosure Number: IPCOM000045764D
Original Publication Date: 1983-Apr-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Haines, RS: AUTHOR

Abstract

Ferromagnetic chromium dioxide particles are treated in order to produce particles which are stable in the presence of water and/or the organic substances found in magnetic recording media. This treatment substantially completely eliminates detrimental Cr(VI) ions.

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Treatment of Chromium Dioxide Particles

Ferromagnetic chromium dioxide particles are treated in order to produce particles which are stable in the presence of water and/or the organic substances found in magnetic recording media. This treatment substantially completely eliminates detrimental Cr(VI) ions.

This treatment procedure involves the use of alcohols or saccharides, more specifically, CH(3)OH (methyl alcohol), C(2)H(5)OH (ethyl alcohol), or C(12)H(22)O(11) (sucrose).

When chromium dioxide particles are treated with the above materials, the particles do not exhibit the presence of Cr(VI) ions, as evidenced by the lack of a yellow color when the treated particles are mixed with water, and by the lack of a purple color when the treated particles are subjected to a peroxide solution.

Magnetic recording media using these stabilized particles in a urethane binder do not exhibit an appreciable loss of molecular weight as a function of time.

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