| 摘要 |
PURPOSE:To obtain a colorant for a toner superior in coloring effect, dispersibility, heat resistance, etc. through a simple reaction process, by heat treating a divalent or more-valent metal or its compound at 400-2,000 deg.C or in addition, coating it with a resin. CONSTITUTION:The colorant to be used for a toner is obtained by heat treating an oxide of a divalent or more-valent metal, such as Ti, Ba, Ni, Sb, Cr, Fe, Zn, Co, Al, or Mn, or a compound of said metals, such as oxide, hydroxide, or salt, at 400-2,000 deg.C depending on the kinds of metals or their compounds, preferably, 600-1,200 deg.C. In order to enhance dispersibility, the heat-treated metallic pigment may be coated with a resin (flashing treatment). Heat treatment of a mixture of several kinds of compound permits a desirable tone to be obtained. For example, TiO2, BaSO4, and nickel oxide are treated for 6hrs at 600 deg.C, water is added, and further the mixture is treated for 3hrs to form a yellow metallic pigment. |
