| 摘要 |
PURPOSE:To improve fluidity and developing characteristics by subjecting polymer particles contg. a coloring agent obtd. by separating the same from an aq. medium for >=30min at 35-75 deg.C after a suspension polymn. stage. CONSTITUTION:A mixture composed of a monomer, polymn. initiator and other additives such as coloring material, magnetic material, resin, release agent, crosslinking agent and charge controlling agent is stirred and mixed in an aq. medium, by which the mixture is pulverized and is polymerized in the pulverized particle state. The resultant polymer particles are separated from the aq. solvent and thereafter the particles are subjected to the heating treatment for >=30min at 35 deg.C-75 deg.C which is near Tg (Tg+ or -30 deg.C) of the resin for the toner. The heating temp. and heating time are adequately determined within the range of 35-75 deg.C and >=30min where the flocculation and adhesion of the polymer particles to each other does not arise. |
