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Chromium Dioxide Particle Stabilization

IP.com Disclosure Number: IPCOM000051187D
Original Publication Date: 1982-Aug-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Simonetti, A: AUTHOR

Abstract

Chromium dioxide particles for magnetic media can be stabilized in a water-based polyurethane binder by the addition of a formaldehyde solution to the binder. The formaldehyde prevents the formation of chromates.

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Chromium Dioxide Particle Stabilization

Chromium dioxide particles for magnetic media can be stabilized in a water- based polyurethane binder by the addition of a formaldehyde solution to the binder. The formaldehyde prevents the formation of chromates.

Formaldehyde can be used to treat chromium dioxide magnetic particles to stabilize the particles by preventing the formation of chromate in a water-based binder. The pot life of the organic binder formulation can be increased by the addition of a crosslinker to a polyurethane binder. The chromium dioxide particles are treated by the formate from a formaldehyde solution to prevent a reaction between the particles and the binder solution. The binder and the particles can be used as a magnetic coating for flexible magnetic media.

Chromium dioxide is unstable in water, forming soluble chromates. In order to stabilize the chromium dioxide when used in a water-based polyurethane binder system, the chromium dioxide particles can be added to a formaldehyde solution in water. No yellow color, indicating chromates, was produced when the chromium dioxide particles were placed into the formaldehyde-water solution. The formation of the chromates was inhibited by the presence of the formaldehyde.

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