| 摘要 |
<p>PURPOSE:To obtain a toner with higher safeness which does not give bad influences on a human body or the environment and shows improved characteristics such stability against environments or the like by compounding plural colors of edible nonaquious coloring agents except for a black color to color the toner into black. CONSTITUTION:At least two colors of edible nonaquious coloring agents which produce black by mixing colors are compounded except for a black coloring agent to color the toner into black. As for the combination of the nonaquious coloring agents to color the electrophotographic toner into black, combinations of three primary colors, namely, red (magneta), yellow and blue (cyan) are basic, and for example, a combination of two colors such as blue and orange, green and red, purple and yellow can produce black. As for the edible nonaquious coloring agents, edible lakes are preferable which are prepared by making water soluble food color to adsorb to a metallic salt as a matrix. As for the metal to react with the water soluble food color to produce a salt is aluminum or the like. As for the matrix to adsorb the metallic salt, an extender having adsorptivity such as aluminum hydroxide is used.</p> |
