摘要:
A magnetic developer for developing electrostatic images is constituted by magnetic toner particles, each containing a binder resin having a melt viscosity of at most 5.0.times.10.sup.6 poise at 150.degree. C. and a magnetic material. The magnetic material is blended with a proportion (C) [wt. %] of inorganic fine particles based on the magnetic material to carry 0.2-5 wt. % of the inorganic fine particles secured to the magnetic material surface. The magnetic material has a specific surface area (A) [m.sup.2 /g] before securing of the inorganic fine particles and is provided with an increase in surface area (B) [m.sup.2 /g] by the securing of the inorganic fine particles; wherein the parameters A, B and C satisfy the following formulae (1) and (2):0.1.ltoreq.B/A.ltoreq.0.8 (1)B
摘要翻译:用于显影静电图像的磁性显影剂由磁性调色剂颗粒构成,每个磁性调色剂颗粒含有在150℃下熔体粘度至多为5.0×10 6泊的粘合剂树脂和磁性材料。 将磁性材料与(C)[wt。 %]基于磁性材料的无机细颗粒携带0.2-5重量% %的无机细颗粒固定在磁性材料表面上。 磁性材料在固定无机细颗粒之前具有比表面积(A)[m2 / g],并且通过确保无机细颗粒而使表面积(B)[M2 / g]增加。 其中参数A,B和C满足下列公式(1)和(2):0.1 B / A = 0.8(1)B <30×C(2)。 结果,磁性显影剂具有改善的低温定影性,而不会引起使用低温软化粘合剂树脂的问题,例如抗偏移特性的劣化,储存特性,显影特性。
摘要:
An electrophotographic toner composition suitable for heat-fixation and showing good storage characteristics is constituted by polymer components, a colorant and a metal-containing organic compound. The toner composition shows a melt index (at 125.degree. C., 10 kg-load) of 5-25 g/10 min., and the polymer components are characterized by (a) containing substantially no THF (tetrahydrofuran)-insoluble content, (b) including a THF-soluble content thereof providing a GPC (gel permeation chromatography) chromatogram showing i) a main peak in a molecular weight region of 2.times.10.sup.3 -3.times.10.sup.4, and a sub-peak or shoulder in a molecular weight region of at least 10.sup.5, and ii) an areal percentage of 3-10% in a molecular weight region of at least 10.sup.6, and (c) including a polymer component (H) in a molecular weight region of at least 10.sup.5 obtained by polymerization using a polyfunctional polymerization initiator and a monofunctional polymerization initiator.