摘要:
A toner is disclosed which has toner particles and an external additive. The toner has (a) in circularity distribution of particles measured with a flow type particle image analyzer, an average circularity of from 0.920 to 0.995, containing particles with a circularity of less than 0.950 in an amount of from 2% by number to 40% by number; and (b) a weight-average particle diameter of from 2.0 .mu.m to 9.0 .mu.m as measured by Coulter method. The external additive has, on the toner particles, at least (i) an inorganic fine powder (A) present in the state of primary particles or secondary particles and having an average particle length of from 10 m.mu.m to 400 m.mu.m and a shape factor SF-1 of from 100 to 130 and (ii) a non-spherical inorganic fine powder (B) formed by coalescence of a plurality of particles and having a shape factor SF-1 of greater than 150. Also, a two-component developer and an image forming method, using the toner, are disclosed.
摘要:
A toner is comprised of toner particles containing at least a binder resin and a colorant, and an external additive fine powder. The toner particles have a specific circularity distribution and a specific particle size distribution. The external additive fine powder has an inorganic fine powder having as primary particles a specific number-average particle length, and a non-spherical inorganic fine powder formed by coalescence of particles and having a specific shape factor and a specific number-average particle length.
摘要:
An image forming method using a dry toner and exhibiting good quick-start and power economization characteristics is provided. The image forming method includes a heat-pressure fixing step using a rotatable electromagnetic induction heat-generation type heating member. The toner used therein is characterized by a moisture content of at most 3.00 wt. %, and viscoelasticities as represented by a storage modulus at 110° C. of G′ (110° C.) and a storage modulus at 140° C. of G′ (140° C.) satisfying: G′ (110° C.)≦1.00×106 dN/m2, and G′ (140° C.)≧7.00×103 dN/m3.
摘要:
An electrophotographic toner is formed of toner particles each comprising at least a binder resin, a colorant and a release agent, and a low-crystalline aromatic metal compound present at surfaces of the toner particles. The toner has an average circularity of at least 0.955, and the low-crystalline aromatic metal compound has an X-ray diffraction characteristic free from peaks exhibiting a measurement intensity of at least 10000 cps and a half-value half-width of at most 0.3 deg. in a range of measurement angles 2&thgr; of 6 to 40 deg. Because of the low crystallinity, the aromatic metal compound is uniformly applied onto the toner particle surfaces to stabilize the chargeability and transferability of the toner.
摘要:
In an image forming method for forming multi-color images or full-color images, first to third or fourth toners are used, and the amount of cross-linking agent contained in each of the toners becomes larger in the order of the toners laid on a recording sheet. Each of the toners has a color different from the others, the color selected from yellow, cyan, magenta and black.
摘要:
A magnetic toner includes: magnetic toner particles each comprising at least a binder resin and magnetic toner, and inorganic fine powder. The magnetic toner has an average circularity of at least 0.970, and a magnetization of 10-50 Am2/kg at a magnetic field of 79.6 kA/m. The magnetic powder comprises at least magnetic iron oxide. The magnetic toner particles retain carbon in an amount of A and iron in an amount of B at surfaces thereof as measured by X-ray photoelectron spectroscopy, satisfying: B/A
摘要翻译:磁性调色剂包括:各自至少包含粘合剂树脂和磁性调色剂的磁性调色剂颗粒和无机细粉末。 磁性调色剂在79.6kA / m的磁场下的平均圆形度为至少0.970,磁化强度为10-50Am 2 / kg。 磁粉至少包含磁性氧化铁。 磁性调色剂颗粒通过X射线光电子能谱法测定其表面的B量的A和铁的碳,满足:B / A <0.001。 粘合剂树脂包括由至少包含苯乙烯单体的单体的聚合形成的树脂。 磁性调色剂的残留苯乙烯单体含量小于300ppm,并且包含满足以下关系的至少50%的调色剂颗粒:D / C <= 0.02,其中C表示磁性的体积平均粒径 调色剂,D表示磁性调色剂颗粒的表面与磁性调色剂颗粒中所含的磁性粉末颗粒之间的最小距离。 由于上述特征,即使在无清洁器模式的图像形成系统中,磁性调色剂也能表现出良好的电摄影性能,包括极佳的带电性和少量的转印残留调色剂。
摘要:
A magnetic toner has magnetic toner particles, each of the magnetic toner particles containing a binder resin and a magnetic material, and an inorganic fine powder. The magnetic material is prepared by treating the surface of magnetic iron oxide with a silane compound. When the magnetic iron oxide is dispersed in an aqueous solution of hydrochloric acid and dissolved until the dissolution proportion of the iron element reaches 5% by mass based on the total amount of the iron element contained in the magnetic iron oxide, the amount of silicon eluted by that point of time is 0.05% by mass or more and 0.50% by mass or less based on the magnetic iron oxide. The magnetic material has a moisture adsorption amount per unit area of 0.30 mg/m2 or less.
摘要翻译:磁性调色剂具有磁性调色剂颗粒,每个磁性调色剂颗粒含有粘合剂树脂和磁性材料,以及无机细粉末。 通过用硅烷化合物处理磁性氧化铁的表面来制备磁性材料。 当磁性氧化铁分散在盐酸水溶液中并溶解,直到铁素的溶解比例相对于磁性氧化铁中含有的铁元素的总量达到5质量%时,硅的洗脱量 该时间点为基于磁性氧化铁的0.05质量%以上且0.50质量%以下。 磁性材料的每单位面积的吸湿量为0.30mg / m 2以下。
摘要:
To provide a magnetic toner which has superior low-temperature fixing performance and pressure roller anti-staining properties even in various forms of use, has been kept from image defects such as image non-uniformity even during long-time image reproduction and can achieve high-level image quality. In a magnetic toner having toner particles containing at least a binder resin and a magnetic material, the activation energy Ea (kJ/mol) that is determined from a shift factor aT120 in a master curve of the toner, prepared when 120° C. is set as reference temperature, and the activation energy Eb (kJ/mol) that is determined from a shift factor aT150 in a master curve of the toner, prepared when 150° C. is set as reference temperature, satisfy Expression (1), and the Ea is 110 kJ/mol or less: 1.00≦Ea/Eb
摘要:
An object of the present invention is to provide a toner excellent in durability and storage stability, and having good fixing performance in a wide fixing temperature region even at a high process speed. According to the present invention, there is provided a toner containing: a binder resin; a colorant; and a polyester resin, in which: I) the polyester resin contains at least, as a main component, polyester obtained by subjecting a monomer composition containing an alcohol selected from aliphatic diols each having 2 to 22 carbon atoms and a carboxylic acid selected from aliphatic dicarboxylic acids each having 2 to 22 carbon atoms to a polycondensation reaction; and II) a region having a lamellar structure is present at a surface layer of the toner.
摘要:
A toner has toner particles and an external additive. The toner particles have a weight-average particle diameter of from 4 &mgr;m to 9 &mgr;m. The external additive has (i) first, small-particle-diameter hydrophobic fine silica particles (A) having a BET specific surface area of from 100 m2/g to 350 m2/g, having been treated with a silane, (ii) second, large-particle-diameter hydrophobic fine silica particles (B) having a BET specific surface area of from 15 m2/g to 80 m2/g, having been treated with a silicone oil, and (iii) fine alumina particles (C) having a BET specific surface area of from 50 m2/g to 150 m2/g.