Preparing dry toner particles for metallic effect

A method for preparing metallic dry toner particles that provide a metallic effect, the method comprising:

• dry blending resin particles with non-conductive metal oxide particles, and optionally one or more of a charge control agent, wax, lubricant, fuser release aid, or colorant to form a dry blend,
• melt extruding the dry blend under low shear conditions in an extrusion device to form an extruded composition, at a temperature of at least 120° C. and up to and including 240° C. and a melt viscosity of at least 150 pascals sec and up to and including 1200 pascals sec,
• orienting the non-conductive metal oxide particles in the same direction in the extruded composition as the extruded composition exits the extrusion device by extending the extruded composition as it exits the extrusion device to orient the non-conductive metal oxide particles in the same direction of extrusion so that the extruded composition stays intact before the breaking it into metallic dry toner particles, and
• breaking up the extruded composition into metallic dry toner particles, each metallic dry toner particle consisting essentially of a polymeric binder phase formed from the resin particles, and the non-conductive metal oxide particles dispersed within the polymeric binder phase,
• wherein:
• (a) each the metallic dry toner particle has a mean volume weighted diameter (Dvol) before fixing of at least 15 μm and up to and including 40 μm,
• (b) the non-conductive metal oxide particles comprise silica, alumina, or mica, have an aspect ratio of at least 5, have an ECD of at least 2 μm and up to and including 50 μm, and are present in each metallic dry toner particle in an amount of at least 20 weight % and up to and including 50 weight %, based on total metallic dry toner particle weight, and
• (c) the ratio of the metallic dry toner particle Dvol to the average equivalent circular diameter (ECD) of the non-conductive metal oxide particles in the metallic dry toner particles, before fixing, is greater than 0.1 and up to and including 10.