Carrier and developer for electrostatic image development, and image formation method and apparatus

An electrostatic image development, developer technology, applied in the direction of developer, electric recording process applying charge pattern, electric recording process applying charge pattern, etc. and/or the long-term stability of the resistance and the effect of inhibiting adhesion

Active Publication Date: 2007-07-25
FUJIFILM BUSINESS INNOVATION CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Considering this fact, the carrier of this document is still insufficient in terms of abrasion resistance and inhibition of carrier attachment

Method used

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  • Carrier and developer for electrostatic image development, and image formation method and apparatus
  • Carrier and developer for electrostatic image development, and image formation method and apparatus
  • Carrier and developer for electrostatic image development, and image formation method and apparatus

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0088] The carrier of the first embodiment (carrier particle having a magnetic particle as a core)

[0089] In the carrier of the first embodiment, examples of the core material include: magnetic metals such as iron, steel, nickel, and cobalt; alloys of at least one of these metals with manganese, chromium, and / or rare earth elements (e.g., iron-nickel alloys, cobalt-iron alloys, and aluminum-iron alloys); and magnetic oxides such as ferrites and magnetite. Considering the use of the magnetic brush method as the developing means, the core is preferably magnetic particles.

[0090] In the carrier of the first embodiment, the volume average particle diameter of the core is preferably about 10 μm to about 500 μm. In the first and third to fifth aspects, the volume average particle diameter is more preferably about 30 μm to about 150 μm, still more preferably about 30 μm to about 100 μm. In the second aspect, the volume average particle diameter is more preferably about 20 μm to...

Embodiment 1

[0297] With elbow jet (elbow-jet) equipment (product number: EJ-LABO, produced by Nippon Steel Mining Co., Ltd.), at the classification point of 25 μm and 45 μm, ferrite particles (comprising Cu-Zn, and having 4.5g / cm 3 Density, volume average particle diameter of 35 μm and shape factor SF1 of 125) were classified to remove powder and coarse powder to obtain core particles to be coated.

[0298] For the resulting particle size distribution of the core particles to be coated, the particle size distribution index (D 84v / D 50v ) is 1.18, and the particle size distribution index on the particle side (D 50P / D 16P ) is 1.20, the volume average particle diameter is 37 μm, and the shape factor SF1 is 124.

[0299] 20 parts by mass of a toluene solution (solid content: 15 parts by mass) of a styrene-methyl methacrylate copolymer (weight average molecular weight 80,000) was added to 100 parts by mass of the core particles to be coated. The resulting mixture was stirred for 10 mi...

Embodiment 2 to 4

[0305] Carriers (2) to (4) were produced in the same manner as in Example 1, except that, for the number of repetitions of the powder / coarse powder removal treatment with an elbow spraying device to obtain a resin-coated carrier, From three times to 2 to 5 times. The respective total energies of carriers (2) to (4) are listed in Table 1.

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PUM

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Abstract

The present invention provides a carrier for electrostatic image development, and a developer, an image formation method and an image formation apparatus using the carrier. The carrier is carrier particles. When the carrier particles each have a coating layer on a magnetic particle, the carrier has a total energy amount of 1500 to 3000 mJ. When the carrier particles each have a coating layer on a magnetic powder-dispersed particle, the carrier has a total energy amount of 1000 to 1500 mJ. The total energy amount is measured with a powder rheometer at a tip end speed of a rotor of 100 mm / s and a helix angle of the rotor of -5 DEG . The total energy amount is a value of a portion of the carrier in a measurement container which portion is contained in the region between the packed surface of the carrier and a surface disposed under the packed surface by 70 mm.

Description

technical field [0001] The present invention relates to a carrier for developing an electrostatic image, a developer for developing an electrostatic image, an image forming method, and an image forming apparatus for developing an electrostatic latent image, for example, in electrophotography or electrostatic recording. Background technique [0002] A method of visualizing image information through an electrostatic latent image using electrophotography is currently used in various fields. In the electrophotography method, an image is obtained through the steps of: forming an electrostatic image on a photoreceptor (latent image holder) in charging and exposing steps; developing the electrostatic image with a developer containing toner to obtain a toner an image, wherein the toner contains a colorant and a binder resin; transfer the toner image to the surface of the recording material; and fix the toner image on the recording material using, for example, a hot roller. Cleaning...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/107G03G9/08G03G13/00G03G15/00
Inventor 松本晃饭塚章洋福田裕之清野英子矢野敏行
Owner FUJIFILM BUSINESS INNOVATION CORP
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