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MAGNETIC PIGMENTS

IP.com Disclosure Number: IPCOM000023780D
Original Publication Date: 1979-Feb-28
Included in the Prior Art Database: 2004-Mar-31
Document File: 2 page(s) / 170K

Publishing Venue

Xerox Disclosure Journal

Abstract

Pigment materials having low-bulk densities are obtained by depositing a magnetic or magnetically attractable metal in the presence of and onto low-bulk density silica particles. The low-bulk density, magnetic, composite pigment particles are prepared by the solution phase thermal decomposition of transition metal carbonyls

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XEROX DISCLOSURE JOURNAL

MAGNETIC PIGMENTS Proposed Classification Ronald F. Ziolo U.S. Cl, 96/I

mt. Cl. G03g

Pigment materials having low-bulk densities are obtained by depositing a magnetic

or magnetically attractable metal in the presence of and onto low-bulk density silica particles. The low-bulk density, magnetic, composite pigment particles are prepared by the solution phase thermal decomposition of transition metal carbonyls

in the presence of the silica particles with a suitable suspending medium. Air and moisture are excluded from the reaction vessel, the contents heated with stirring so that the carbonyl decomposes, and the mixture is refluxed until the temperature rises to that of the suspending medium whereupon coating of the silica particles with elemental metal is complete. The mixture is cooled and filtered in the absence of air, the particles are washed, dried in vacuum at ambient temperatures

and recovered.

Volume 4 Number 1 January/February 1979 7

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