| 摘要 |
PURPOSE:To obtain a powdered developer for electrophotography with superior electrostatic characteristics, by adding a specified 2:1 type metallic complex salt compound as a charging controller and a coloring agent. CONSTITUTION:This powdered developer contains a 2:1 type metallic complex salt compound represented by the formula (where R1 is amino, acetylamino, sulfomethyl or optionally substituted benzoylamino; R2 is nitro or halogen; R3 is H or halogen; n is 1 or 2; m is 1-3; n+m<=4; and M is Cr or Co) as a charging controller and a coloring agent. Since the dye represented by the formula is electrostatically and negatively charged, a negatively chargeable powdered developer can be easily obtd. by mixing the dye with a resin for development in a desired ratio. The reason that the dye has especially improved compatibility with the resin is considered to be that the dye has low bulk specific gravity and high softness and is easily divided into particles. |
