摘要:
The present invention provides an image forming method including the steps of: forming an electrostatic latent image on a latent image holding member; developing the electrostatic latent image by using a color toner to form a toner image; transferring the toner image onto a recording material; and fixing the toner image to the recording material by a heat fixing device including a heating member in contact with the toner image. In the method, the color toner contains at least a binder resin, a colorant and wax, the wax having a molecular weight distribution measured by GPC, which has a ratio of the weight average molecular weight (Mw) to the number average molecular weight (Mn) of 1.45 or less, and a solubility parameter (SP value) of 8.4 to 10.5. If the contact angles between the wax and the heating member at 100.degree. C. and 200.degree. C. are A and B, respectively, the contact angles A and B satisfy the following relations: 60.degree..ltoreq.A.ltoreq.80.degree. 10.degree..gtoreq.B-A.gtoreq.3.degree..
摘要:
Four color toners of yellow, magenta, cyan and black, and four two-component developers containing the four color toners respectively in combination with a resin-coated ferrite carrier suitable for multi-color electrophotographic copying are provided Each of the four-color toners is strictly regulated in relation not only to the carrier but also to the other color toners. More specifically, each color toner is strictly controlled with respect to a particle size distribution, freeness from agglomeration, melting characteristics including heat-absorption peaks and apparent viscosity on melting, chromaticity, triboelectric chargeability and optical toner concentration detection characteristic. Because of the strict regulation of these various parameters, the resultant multi-color toner or developer system shows excellent performances at every stage of multi-color electrophotography including development, transfer and fixing (color-mixing) for a long period of successive copying.
摘要:
An electrostatic latent image on an image-bearing member is developed with a two-component developer comprising a toner and a carrier stored in a developer vessel while supplying as required a replenishing developer to the developer vessel. The replenishing developer comprises 1 wt. part of a carrier and 2-50 wt. parts of a toner, wherein the carrier is a magnetic fine particle-dispersed resin carrier comprising at least inorganic compound particles and a carrier binder resin, and the toner has a weight-average particle size of 3 to 10 μm and contains 1 to 40 wt. % of solid wax.
摘要:
A non-metallic black toner is disclosed. The toner has toner particles containing at least a binder resin, a carbon black and an organometallic compound, and an external additive. The toner particles contain 10 to 200 ppm of at least one kind of alkali metal element and at least one kind of organometallic compound. The toner particles further contain a polyester resin. The non-metallic black toner has a weight-average particle diameter of 4 to 11 &mgr;m, the following loss tangents tan &dgr; shown by dielectric loss factor ∈″/dielectric constant ∈′ at frequencies of 5×104 Hz and 105 Hz: tan &dgr; (5×104 Hz)≦0.0125 tan &dgr; (105 Hz)≦0.0105, a Carr's flowability index of 50 or more, and a Carr's floodability index of 65 or more. Also, an image forming method is disclose using the black toner.
摘要:
Four color toners of yellow, magenta, cyan and black, and four two-component developers containing the four color toners respectively in combination with a resin-coated ferrite carrier suitable for multi-color electrophotographic copying are provided. Each of the four-color toners is strictly regulated in relation not only to the carrier but also to the other color toners. More specifically, each color toner is strictly controlled with respect to a particle size distribution, freeness from agglomeration, melting characteristics including heat-absorption peaks and apparent viscosity on melting, chromaticity, triboelectric chargeability and optical toner concentration detection characteristic. Because of the strict regulation of these various parameters, the resultant multi-color toner or developer system shows excellent performances at every stage of multi-color electrophotography including development, transfer and fixing (color-mixing) for a long period of successive copying.
摘要:
A method of reverse development for depositing the toner particles to the light potential area of a photosensitive member. The developer used contains magnetic carrier particles and toner particles. An alternating electric field is formed in the developing position or zone. A relative volumetric ratio Q (%) of the magnetic carrier particles in the developing position satisfies 15.0.ltoreq.Q.ltoreq.28.0. The relative volumetric ratio is defined asQ=(M/h).times.(1/.rho.).times.C.sigma./(T+C)where M (g/cm.sup.2) is an amount of applied developer on a developing sleeve surface per unit area, h (cm) is a height of space in the developing position, .rho. (g/cm.sup.3) is a true density of the magnetic carrier particles, C/(T+C) (%) is a weight ratio of the carrier particles in the developer on the surface of the sleeve, and .sigma. is a ratio of a peripheral speed of the sleeve relative to the peripheral speed of the photosensitive member.
摘要:
A method for applying a toner comprising: forming, in a container containing a toner and magnetic particles for application of the toner, a magnetic brush of the magnetic particles; circulating the magnetic particles in the container; and forming a thin layer of the toner electrically charged on the toner carrying member; wherein the magnetic particles have a particle size distribution of 30 wt. % or more in the range of 150 to 200 mesh and 5 wt. % or less of under 250 mesh, and the weight ratio of the toner to the magnetic particles is from 5:95 to 50:50 in the region where the magnetic brush is formed.