Patent ID: 6423172
Filing Date: 2002-07-23
Classification: B05D,C23C,H01F,H05K

Abstract:
A method of coating substantive particles, said method comprising the steps of:(a) applying a curable ferrofluid composition to a substrate so as to form a film with a thickness of less than two substantive particle diameters, wherein the curable ferrofluid composition comprises: (i) a colloidal suspension of ferromagnetic particles in a non-magnetic carrier liquid, and (ii) substantive particles; (b) subjecting the film of (a) to a magnetic field for a time sufficient to array the substantive particles in the film in a non-random pattern; (c) exposing the magnetic field-stimulated film of (b) to conditions favorable to at least cure partially the film and bond the substantive particles to the substrate; (d) removing uncured curable ferrofluid composition; and (e) subjecting the bound non-random arrayed substantive particles of (c) to a coating material under conditions favorable to effect coating of the substantive particles.