Browse Prior Art Database

MAGNETIC TONER MATERIALS

IP.com Disclosure Number: IPCOM000023783D
Original Publication Date: 1979-Feb-28
Included in the Prior Art Database: 2004-Mar-31
Document File: 2 page(s) / 155K

Publishing Venue

Xerox Disclosure Journal

Abstract

Toner 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 toner particles are prepared by the solution phase thermal decomposition of transition metal carbonyls in the

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XEROX DISCLOSURE JOURNAL

MAGNETIC TONER MATERIALS Proposed Classification

Ronald F. Ziolo U.S. Cl, 96/1.5 mt. G03g 5/04

Toner 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 toner 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 ref luxed 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 an insulating polymer is mixed therewith to form a coating thereon. -

Volume 4 Number 1 3anuary/February 1979 13

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