摘要:
An electrophotographic developer comprising a toner and a carrier is disclosed. The toner contains a toner binder resin, a colorant and a releasing agent, and a carrier contains a magnetic particles dispersed in a carrier binder resin, wherein the releasing agent contained in toner is composed of from 40 to 98% by weight of a first releasing agent component of an ester compound and 60 to 2% by weight of a second releasing agent component of a hydrocarbon compound having a branched-chain structure, and the carrier has a shape coefficient SF-1 of from 1.0 to 1.2 and a shape coefficient S-2 of from 1.1 to 2.5, and a volume based median diameter of from 10 to 100 μm.
摘要:
An electrophotographic apparatus includes: a photoconductor; and two developing rollers facing the photoconductor. A developer fed out from between the two developing rollers is supplied to the photoconductor by the two developing rollers to form a toner image on the photoconductor. The developer includes a carrier having a volume-average particle size smaller than 70 μm and a volume resistivity not lower than 106 Ω·cm. A volume ratio of the carrier in a facing portion between the photoconductor and the developing rollers is not lower than 30% and not higher than 46%.
摘要:
A carrier including a magnetic core material and a layer located on a surface of the magnetic core material, wherein the carrier satisfies the following relationships (1) to (3): 0.90≦(σa/σb)
摘要:
A carrier core material for an electrophotographic developing agent, which comprises 100 parts by weight of a ferrite component represented by a formula (A) and 0.1 to 5.0 parts by weight of ZrO2 that is present in the ferrite component without forming a solid solution, and which has a magnetization, at 1000(103/4π·A/m), of 65 to 85 Am2/kg and an electrical resistance, at an applied voltage of 1000 V, of 105 to 109 Ω. (MnO)x(MgO)y(Fe2O3)z (A) wherein x, y and z are each expressed in % by mol and are numbers satisfying the conditions of 40≦x≦60, 0.1≦y≦10 and x+y+z=100. Also disclosed is a two-component developing agent comprising a coated carrier, which is obtained by coating the above carrier core material with a resin, and toner particles. Further disclosed is an image forming method comprising developing an electrostatic latent image formed by the use of an alternating electric field, with the two-component developing agent. The carrier core material and the coated carrier have high magnetization and high resistance. According to the two-component developing agent of the invention, an excellent image can be formed.
摘要翻译:用于电子照相显影剂的载体芯材料包含100重量份由式(A)表示的铁氧体组分和0.1至5.0重量份存在于铁素体中的ZrO 2 N 2 在不形成固溶体的情况下,在1000(10 3 / 4pi.A / m)下具有65至85Am 2 / kg的磁化,并且 在1000V的施加电压下,电阻为10 5至10 9Ω。 (MnO)x(x)y(x)2(x) (A)<?in-line-formula description =“In-line Formulas”end =“tail”?>其中x, y和z各自以摩尔%表示,并且是满足40 <= x <= 60,0.1 <= y <= 10和x + y + z = 100的条件的数字。 还公开了一种双组分显影剂,其包括通过用树脂涂覆上述载体芯材料和调色剂颗粒而获得的涂布载体。 进一步公开了一种图像形成方法,其包括使用双组分显影剂显影通过使用交变电场形成的静电潜像。 载体芯材和涂层载体具有高磁化强度和高电阻。 根据本发明的双组分显影剂,可以形成优异的图像。
摘要:
A developer composition comprising a magnetic toner and a mixture comprised of bare carrier core particles free of a coating and coated carrier particles, and wherein said bare carrier core particles are present in an amount of from about 50 weight percent to about 90 weight percent, and said coated carrier particles are present in an amount of from about 50 weight percent to about 90 weight percent, and wherein the total thereof is about 100 percent.
摘要:
A developer composition having improved noise signal ratio in an optical toner concentration sensing system, including a toner having a first diffuse reflectivity and a carrier having a second diffuse reflectivity wherein the difference between the first diffuse reflectivity and the second diffuse reflectivity is substantially high.
摘要:
An image formation method which remarkably extends developer life while providing size reduction and high speed coloring. Also, a replenishing toner and a method of producing the same, and a toner cartridge. In the image formation method, conducting image formation by an image formation apparatus having a plurality of xerography units, the developer apparatus of at least one xerography unit has a developer recovering mechanism appropriately replenishing a replenishing toner composed of a toner and a carrier into the developer apparatus and recovering an excess portion of a developer from the equipment. The above-mentioned replenishing toner has a carrier content in the range of 5 to 40% by weight, the above-mentioned carrier is a carrier coated with a resin having a specific composition, and/or the above-mentioned toner is in a specific shape. The replenishing toner may be produced using the above-mentioned recovered developer.
摘要:
An image forming apparatus is provided for obtaining excellent developing properties using toner with small particle diameters and for forming high-quality visual images. In a developing device of an image forming apparatus, a two-component developer is used which satisfies conditions that volume mean particle diameter dt of a toner is 3˜5 &mgr;m (Condition 1), volume mean particle diameter dc of a carrier is 5 dt˜10 dt (Condition 2), and a weight ratio Rw of the toner and the carrier is 1.6 (dt/dc) ×(&rgr;t/&rgr;c)˜2.4 (dt/dc)×(&rgr;t/&rgr;c) (Condition 3, where &rgr;t and &rgr;c are density of the toner and the carrier, respectively). A main magnetic pole M of a rotary sleeve is arranged in the vicinity of the closest position of the rotary sleeve and an image forming body, and the closest distance D between the rotary sleeve and the image forming body satisfies a condition that D is 0.5 H˜0.8 H for the free tip height H of a magnetic brush B of the main magnetic pole M. It is preferable that the actual supplied amount of the toner is regulated within a specific range.
摘要:
An oil based ink composition for inkjet printer comprising colored resin particles obtained by dispersion polymerization of a monofunctional polymerizable monomer (M) with coloring component fine particles comprising a surface-treated coloring agent, which are dispersed in a non-aqueous solvent having a dielectric constant of from 1.5 to 20 and a surface tension of from 15 to 60 mN/m at 25null C., as seed particles, in the presence of a dispersion stabilizer (P) soluble in the non-aqueous solvent and a polymerization initiator.
摘要:
The present invention provides a carrier for electrophotography, which is capable of charging the toner in the developer very rapidly to a target electrostatic charge and at the same time, is capable of maintaining the target electrostatic charge during printing, so that the chemical fogging related to the slow charging rate can be eliminated and the image density related to the maintenance of the electrostatic charge can be preserved during printing. The charging rate and the charge maintenance of the electrophotographic carrier can be preserved if the carrier composed of magnetic core particles and the resin coat satisfies the following equation (B)>[(−19.4)×(A)+31], wherein (A) represents a carbon content (weight %) of the carrier and (B) represents a ratio of the square root of the number of emitted photoelectrons ((CPS)½) and the photon energy (eV).