Preparation of colloidal iron dispersions by the...

Details Preparation of colloidal iron dispersions by the... Preparation of colloidal iron dispersions by the...

B - Operations, Transporting

01

J

252/81, 204/91.3

B01J 31/28 (2006.01) B01J 31/06 (2006.01) C09D 17/00 (2006.01) G03G 9/08 (2006.01) G03G 9/083 (2006.01) G11B 7/251 (2006.01)

Patent

CA 1152484

ABSTRACT OF THE DISCLOSURE There is disclosed a method for the preparation of a homogeneous, physically stable colloidal elemental iron dispersion of colloidal iron particles having a size in the range of from about 10 Angstrom units to about 200 Angstrom units. The method comprises preparing a solution of a passive polymer in an inert solvent, and incrementally adding thereto an iron precursor, at a temperature at which the iron precursor will lose at least one ligand and become bound to the passive polymer and thermally decompose to produce elemental iron particles, the process being carried out in an inert atmosphere. Such dispersions may be used per se as catalysts, or may be used for the preparation of supported colloidal iron catalysts. The dispersion may also be used for the preparation of ablative optical recording media, and for the preparation of magnetic xerographic developer materials.

364916

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