Manufacture of electrophotographic developer

Abstract

Abstract PURPOSE:To manufacture a (color) toner superior in fluidity and resistance to agglomeration, in a simple process, by heat treating a binder resin powder having a specified softening point, mixed with a colorant powder and/or other powders in a hot gas flow at a specified temp. CONSTITUTION:The titled developer is obtained by mixing a powder of a binder resin having 60-200 deg.C sotening point measured by the method based on JISK 2531, e.g., styrene resin, acrylic resin, polyester resin, polyethylene; a powder of a colorant, e.g., various kinds of org. dye, inorg. dye, various kinds of org. pigment and inorg. pigment, and/or a powder of other component, e.g., a magnetic powder of gamma-Fe3O4 or iron, inorg. oxide, sulfide, nitride, or thermoplastic resin; and heat treating the obtained mixed powder in a hot gas stream at 200- 600 deg.C. As a result a toner or color toner having superior fluidity and agglomeration resistance can be produced through a manufacturing process simplified without requiring a kneading step, therefore, at low cost, and with less danger.

Inventors

• 👤 Tsutomu Kubo
• 👤 勉 久保
• 👤 Masahiro Hosoya
• 👤 雅弘 細矢
• 👤 Tsutomu Uehara
• 👤 上原　勤

Bibliographic Details