JP2000206731A5 - - Google Patents

Description

[0052]
However, by regulating SF-1 and SF-2 of the toner particles as described in the present invention, individual particles can be uniformly charged even if the toner has a small particle size. when the inorganic compound according to the present invention a high charge amount toner particles are in contact, receive the inorganic compound is excessive charge of the toner, the charge amount becomes uniform since the toner charge amount is reduced to an appropriate degree, high definition Images can be obtained over a long period of time.

[0141]
Using the image forming apparatus, a durability test was performed using the toner 13 under the conditions of a temperature of 23 ° C. and a humidity of 60%.

FIG. 1 is a schematic view of a process of an electrophotographic apparatus preferably used in an image forming method of the present invention .

Claims (29)

A toner having toner particles containing at least a binder resin and a colorant and fine particles of an inorganic compound, wherein the inorganic compound is composed of at least a phosphate compound. 2. The toner according to claim 1, wherein the cation constituting the inorganic compound contains at least an ion of a metal selected from alkaline earth metals. The toner according to claim 1, wherein the inorganic compound is composed of at least two or more kinds of cations, and at least one kind is an ion of a metal selected from Group IB and Group VIII metal elements. The inorganic compound is poorly water-soluble fine particles containing a phosphate of an alkaline earth metal as a main component, and a part of the alkaline earth metal is substituted with a metal selected from Group IB and Group VIII metal elements. The toner according to claim 1, wherein: The inorganic compound is a poorly water-soluble fine particle containing a phosphate of an alkaline earth metal as a main component, and a part of the alkaline earth metal near the surface of the fine particle is selected from Group IB and Group VIII metal elements. 4. The toner according to claim 1, wherein the toner is replaced with a metal. The toner according to claim 1, wherein the resistance of the inorganic compound is 10 ⁴ to 10 ¹² Ω · cm. The toner according to any one of claims 1 to 6, wherein the inorganic compound has a number average particle size of 0.05 to 2 µm. The value of the shape factor SF-1 of the toner particles measured by the image analyzer is
100 <SF-1 ≦ 160
The toner according to any one of claims 1 to 7, which satisfies the following. The value of the shape factor SF-2 measured by the image analyzer of the toner particles is
100 <SF-2 ≦ 140
The toner according to claim 1, which satisfies the following. The toner according to any one of claims 1 to 9, wherein the toner particles contain a wax having a softening point of 40 to 90 ° C. 11. The toner according to claim 10, wherein the content of the wax is 0.1 to 50% by weight based on the whole toner. 12. The toner according to claim 1, wherein the toner particles have a weight average particle diameter of 1 to 9 [mu] m. 13. The toner according to claim 1, wherein a part or the whole of the toner particles is formed by a polymerization method. A charging step of charging the electrostatic image carrier, an exposure step of forming an electrostatic latent image on the electrostatic image carrier by irradiation of light energy, and an electrostatic latent image and toner on the electrostatic image carrier A developing step of developing while contacting the thin-layer coated toner on the carrier, and an image forming method having at least a transfer step of transferring the toner image to a transfer material,
An image forming method, wherein the toner has toner particles containing at least a binder resin and a colorant and fine particles of an inorganic compound, and the inorganic compound is at least composed of a phosphoric acid compound. 15. The image forming method according to claim 14, further comprising a cleaning step of removing transfer residual toner remaining on the electrostatic image carrier after the transfer process from the electrostatic image carrier. 16. The image forming method according to claim 15, wherein the cleaning step is performed by the cleaning member in contact with the electrostatic image carrier after the transfer step and before the charging step. The cleaning step is development and cleaning collected by the toner carrier in the developing step, and is performed by a cleaning member that contacts the electrostatic image carrier after the transfer step and before the charging step, and after the charging step and before the developing step. The image forming method according to claim 15, wherein the method does not include a cleaning step. 18. The image forming method according to claim 14, wherein the cation constituting the inorganic compound contains at least a metal ion selected from alkaline earth metals. 19. The method according to claim 14, wherein the inorganic compound is composed of at least two kinds of cations, and at least one kind is an ion of a metal selected from Group IB and Group VIII metal elements. Image forming method. The inorganic compound is poorly water-soluble fine particles containing a phosphate of an alkaline earth metal as a main component, and a part of the alkaline earth metal is substituted with a metal selected from Group IB and Group VIII metal elements. The image forming method according to any one of claims 14 to 19, wherein: The inorganic compound is a poorly water-soluble fine particle containing a phosphate of an alkaline earth metal as a main component, and a part of the alkaline earth metal near the surface of the fine particle is selected from Group IB and Group VIII metal elements. The image forming method according to any one of claims 14 to 19, wherein the image is replaced with a metal. The image forming method according to any one of claims 14 to 21, wherein the resistance of the inorganic compound is 10 ⁴ to 10 ¹² Ω · cm. 23. The image forming method according to claim 14, wherein the number average particle size of the inorganic compound is 0.05 to 2 [mu] m. The value of the shape factor SF-1 of the toner particles measured by the image analyzer is
100 <SF-1 ≦ 160
Images forming method according to any one of claims 14 to 23, characterized by satisfying the. The value of the shape factor SF-2 measured by the image analyzer of the toner particles is
100 <SF-2 ≦ 140
Images forming method according to any one of claims 14 to 24, characterized by satisfying the. The toner particles, images forming method according to any one of claims 14 to 25 softening point, characterized in that it contains 40 to 90 ° C. wax. The content of the wax is based on the total amount of the toner, images forming method according to claim 26, characterized in that from 0.1 to 50 wt%. Images forming method according to any one of claims 14 to 27 wherein the toner particles, characterized in that it has a weight average particle diameter 1 to 9 m. Images forming method according to any one of claims 14 to 28, characterized in that part or all of the toner particles is formed by a polymerization method.