Electronograph developing agent and method of manufacturing the same

DETAILED DESCRIPTION The purpose of the present invention is to provide a developing agent which can be easily prepared in simple steps, and has improved cleaning and anti-crush properties.
Further, another purpose of the present invention is to improve the dispersion property of the coloring agent, the coloring ability of the polymerization toner, and the transparency, especially in color toner.
The first aspect of the invention is to provide a developing agent comprising: a non-uniformly-shaped polymerized particle which is derived from a plurality of aggregated colloidal oil drops; said oil drop comprises a developing agent core and a polymerized monomer for swelling said developing agent core.
The polymerization is carried out through substantially emulsification and suspension.
The second aspect of the invention is to provide a method of manufacturing a developing agent comprising the steps of: i) forming a developing-agent core by adhering a coloring agent electrostatically on the surface of a pre-polymerized substantially spherical resin fine particle; ii) forming a colloidal oil drop by swelling the developing-agent core with a monomer; iii) aggregating the colloidal oil drop into a non-uniformly-shaped aggregated material; and iv) polymerizing the non-uniformly-shaped aggregated material.
The third aspect of the invention is to provide a developing agent comprising a non-uniformly-shaped polymerized particle which is derived from a plurality of colloidal oil drops wherein the colloidal oil drops contain a first colloidal oil drop, having a first diameter, comprising a developing agent core and a first polymerized monomer for swelling the first developing agent core, and a second colloidal oil drop, having a second diameter larger than the first diameter, comprising plural developing agent cores and a second polymerized monomer for swelling the plural developing agent cores.
It is preferable that the developing agent according to the third aspect of the invention contain fine particles having diameters of 0