Two-component developer for developing electrostatic latent image
A two-component developer, electrostatic latent image technology, applied in the direction of developer, electrography, instruments, etc., can solve problems such as excessive reduction in resistance, leakage of developing clamping parts, image defects, etc., to achieve the suppression of changes in resistance, Effects of suppressing white leakage at lead parts and suppressing development leakage
Pending Publication Date: 2019-05-17
KONICA MINOLTA INC
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Problems solved by technology
[0009] However, if the resistance of the initial carrier particles decreases too much, the resin layer on the surface of the carrier particles will be removed, and the core material with lower resistance will be exposed on the surface.
As a result, the resistance decreases excessively, and a leak occurs in the developing nip, which causes a problem that image defects are likely to occur (for example, refer to Patent Document 1).
[0010] Therefore, when adjusting the resistance of the carrier particles, it is difficult to simultaneously suppress the initial leakage of the lead part and the occurrence of the development leakage when the photoreceptor is used for a long time.
Method used
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[0236] Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited thereto.
[0237]
[0238] 90 parts by mass of n-dodecyl sodium sulfate was stirred and dissolved in 1600 parts by mass of ion-exchanged water, and 420 parts by mass of carbon black "Mogul L" (manufactured by Cabot Corporation, pH 2, room temperature 25° C.) was slowly added while stirring the solution.
[0239] Next, dispersion treatment was performed using a stirring device "CREAMIX" (manufactured by M-technique Co., Ltd.), whereby a dispersion liquid of colorant fine particles [Bk] in which carbon black particles were dispersed was prepared. When the particle diameter of the colorant fine particles [Bk] in the dispersion was measured using a Microtrac particle size distribution analyzer "UPA-150" (manufactured by Nikkiso Co., Ltd.), the volume-based median diameter was 85 nm.
[0240]
[0241] In a three-necked flask, prepare and ...
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Abstract
Provided is a two-component developer for developing an electrostatic latent image incorporating: toner particles each containing a toner mother particle having an external additive on a surface of the toner mother particle; and carrier particles each having a core material particle and a covering layer containing a resin on a surface of the core material particle, wherein the external additive contains inorganic particles; the inorganic particles are subjected to surface modification with silicone oil; a carbon content remained on a surface of the inorganic particle after the surface modification is within 3.0 to 10.0 mass %; a free carbon ratio on the surface of the inorganic particle is 70.0% or more; the carrier particles have a resistance in the range of 1.0*10<9> to 5.0*10<10> ohm*cm; and the resin in the covering layer contains a resin formed from a monomer containing an alicyclic methacrylic acid ester monomer.
Description
technical field [0001] The invention relates to a two-component developer for electrostatic latent image development. More specifically, the present invention relates to a two-component developer for developing an electrostatic latent image capable of suppressing the occurrence of initial lead leakage and suppressing the occurrence of development leakage even after long-term use. Background technique [0002] When an image is formed by electrophotography, an electrostatic latent image formed on an image carrier (hereinafter also referred to as a photoreceptor) is visualized by toner development. As the developing method, two methods are conventionally known depending on the rotation direction of the developing sleeve of the developing device that holds the developer and rotates, and the photoreceptor. One of them is a forward developing method, and the other is a reverse developing method. [0003] like Figure 1A As shown, the forward rotation developing method is a devel...
Claims
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IPC IPC(8): G03G9/113G03G9/08
CPCG03G9/09708G03G9/09716G03G9/1133G03G9/1075G03G9/08755G03G9/0819G03G9/0834G03G9/0827G03G9/0823G03G9/1139
Inventor 柴田幸治小原慎也内野哲
Owner KONICA MINOLTA INC