摘要:
A toner for developing an electrostatic image has colorant-containing resin particles and amorphous fine titanium oxide particles comprising primary particles having an average particle diameter of from 1 m.mu. to 200 m.mu..
摘要:
A toner for developing an electrostatic image has colored resin particles-(A) containing a coloring agent or a magnetic powder, and a powdery additive. The powdery additive has organic resin particles-(B) having peaks respectively in a region of particles diameters of 20 m.mu. to 200 m.mu. and a region of particle diameters of 300 m.mu. to 800 m.mu. in their particle size distribution, and the larger-diameters particles included in the region of particle diameters of 300 m.mu. to 800 m.mu. being contained in an amount of from 2% by weight to 20% by weight.
摘要:
In an image forming apparatus having a powder transport mechanism including a powder container and a powder transport means which rotates relative to the powder container, the powder transport means has the rotation center substantially on the axis of the powder container, and the space between the inner wall surface of the powder container and the powder transport means is sealed with magnetic particles held by a magnetic-filed generation means. The magnetic particles have a specific saturation magnetization σs and a specific value of A×σA where the residual magnetic flux density of the magnetic-field generation means is represented by A in a specific range and the magnetization intencity of the magnetic particles in a magnetic field with the residual magnetic flux density A is represented by σA.
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 carrier for use in electrophotography has carrier cores comprising a binder resin and metal compound particles dispersed therein, and a coating resin for coating the surfaces of the carrier cores. Water adsorption TH2O-H (% by weight) after the carrier has been left in an environment of 30° C./80%RH, water adsorption TH2O-L (% by weight) after the carrier has been left in an environment of 23° C./5%RH, and particle surface area Sm (cm2/g) of the carrier satisfy the following relationship: 6.00×10−6≦TH2O-H/(100×Sm)≦1.50×10−5, and 1.00×10−6≦TH2O-L/(100×Sm)≦5.50×10−6.
摘要:
An electrophotographic apparatus includes an electrophotographic photosensitive member, and (i) a charger, (ii) an imagewise exposure device, (iii) a developing device and (iv) a transfer device, disposed in this order opposite to the photosensitive member. The charger includes a charging member including magnetic particles disposed in contact with the photosensitive member so as to charge the photosensitive member based on a voltage received thereby. The magnetic particles are surface-coated with a coupling agent having a linear alkyl group having a least 6 carbon atoms. The developing device also functions to recover residual toner remaining on the photosensitive member processing by the transfer device and the charger. Because of the coating with such a specific coupling agent, the charging magnetic particles can exhibit good triboelectric changeability for the transfer residual toner for a long period.
摘要:
A non-magnetic toner for developing an electrostatic image has non-magnetic toner particles produced by polymerizing in an aqueous medium a polymerizable monomer composition containing at least a polymerizable monomer, a carbon black and an azo type iron compound. The carbon black has a DPB oil absorption of from 110 ml/100 g to 200 ml/100 g, a specific surface area of 100 m.sup.2 /g or below as measured by nitrogen adsorption, a volatile component of 2% or less and an average primary particle diameter of from 20 m.mu. to 60 m.mu., and the azo type iron compound is a compound represented by the following Formula (1). ##STR1##
摘要:
An image forming method is disclosed in which a contact charging means is brought into contact with a latent image bearing member to electrostatically charge the latent image bearing member on which electrostatic latent images are formed and developed with a one component type or two component type developer to form toner images, using a developing assembly provided with a developing container and a developer carrying member. The one component developer is comprised of toner particles. The two component type developer is comprised of toner particles and a magnetic carrier. The toner particles of the one component type and two component type developers contains fine particles as an external additive.The latent image bearing member has a surface layer having a volume resistivity A of from 10.sup.8 to 10.sup.15 .OMEGA..multidot.cm; the contact charging means comprises an assembly for electrostatically charging the latent image bearing member by applying a voltage to a charging member having a volume resistivity B of from 10.sup.4 to 10.sup.9 .OMEGA..multidot.cm; the toner has, as an external additive, fine particles having a volume resistivity C of from 10.sup.7 to 10.sup.11 .OMEGA..multidot.cm; the magnetic carrier has a volume resistivity D1 of from 10.sup.9 to 10.sup.15 .OMEGA..multidot.cm; and the developer carrying member has a surface layer having a volume resistivity D2 of from 10.sup.9 to 10.sup.15 .OMEGA..multidot.cm. The resistivities A, B, C, D1 and D2 stasisfy the following conditions: B
摘要:
A developing apparatus includes a developer layer thickness regulating zone downstream of one of magnetic poles of a stationary magnet disposed inside a developing sleeve, with respect to the rotational direction of the sleeve. In the regulating zone, there are provided a magnetic member and a non-magnetic member to regulate the layer thickness of the developer containing magnetic carrier particles and toner particles on the sleeve. The magnetic member has a width of not less than 1 mm and not more than 10 mm and a thickness of not less than 0.2 mm and not more than 3 mm.
摘要:
A color toner, comprises non-magnetic resin particles containing a coloring agent and two types of inorganic oxide particles, wherein;particles of coloring agent have an average particle diameter D of 300 m.mu..ltoreq.D.ltoreq.800 m.mu. as determined by measurement of scattered-light intensity; coloring agent particles with a particle diameter of from (D-120) m.mu. to (D+120) m.mu. account for not less than 90% of the whole; coloring agent particles with a particle diameter of 169 m.mu. or less account for not more than 1.0%; and coloring agent particles with a particle diameter of 949 m.mu. or more account for not more than 0.5%;said color toner has a volume average diameter of from 6 to 10 .mu.m; colored resin particles with a particle diameter of 5 .mu.m or less are contained in a proportion of from 15 to 40% by number; colored resin particles with a particle diameter of from 12.7 to 16.0 .mu.m are contained in an amount of from 0.1 to 5.0% by volume; colored resin particles with a particle diameter of 16 .mu.m or more are contained in an amount of not more than 1.0% by volume; and colored resin particles with a particle diameter of from 6.35 to 10.1 .mu.m have a particle size distribution that satisfies the following expression:9.ltoreq.V.times.dv/N.ltoreq.14 wherein V represent a volume percentage of colored resin particles with a diameter of from 6.35 to 10.1 .mu.m; N represents a number percentage of colored resin particles with a diameter of from 6.35 to 10.1 .mu.m; and dv represents a volume average particle diameter of the whole colored resin particles; andsaid inorganic oxide particles comprise a hydrophobic inorganic oxide (A) having an absolute value of not less than 50 .mu.c/g for the amount of triboelectricity and a specific surface area S.sub.A of from 80 to 300 m.sup.2 /g as measured by the BET method, contained in an amount of a% by weight based on the colored resin particles, and a hydrophilic inorganic oxide (B) having an absolute value of not more than 20 .mu.c/g for the amount of triboelectricity and a specific surface area S.sub.B of from 30 to 200 m.sup.2 /g as measured by the BET method, contained in an amount of b% by weight based on the colored resin particles, where S.sub.A .gtoreq.S.sub.B, a.gtoreq.b, and 0.3.ltoreq.a+b.ltoreq.1.5.