| 摘要 |
PURPOSE:To increase the gravity of the titled toner and to improve the fluidity of the titled toner by incorporating a specific composite oxide type pigment to the titled toner. CONSTITUTION:The core substance contg. a coloring pigment A, a binder polymer B and an org. solvent C is enclosed in a resin shell D. Said pigment A is composed of the composite oxide type pigment contg. preferably >=2 kinds of oxides comprising TiO2, BaO, NiO, Sb2O3, Cr2O3, Fe2O3, ZnO, CoO, Al2O3, CuO and MnO. The more than one kind of said oxides is incorporated in the core. The outer shell D is preferably composed of polyurea and/or polyurethane which are formed by an interfacial polymerization, an internal polymerization or an external polymerization. And, the solvent C is preferably, exemplified by alkylnaphthalene, alkyldiphenyl ether or diaryl alkane which is capable of dissolving or swelling the polymer B and has >=150 deg.C b.p. |
