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Two-component developer for electrostatic charge image development

A two-component developer, electrostatic image development technology, applied in the direction of developer, electrography, instruments, etc., can solve the problem of unfavorable carrier consumption.

Pending Publication Date: 2020-06-05
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, although the inclusion of a crystalline polyester resin is advantageous in terms of low-temperature fixing, at a temperature close to normal temperature, the toner becomes soft and the developer is durable (used for a long time), in terms of carrier consumption. unfavorable

Method used

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  • Two-component developer for electrostatic charge image development
  • Two-component developer for electrostatic charge image development
  • Two-component developer for electrostatic charge image development

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0164] As binder resins used in the preparation of masterbatches or kneading with masterbatches, in addition to the above-mentioned modified and unmodified polyester resins, polystyrene, polyparachlorostyrene, and polyvinyltoluene can be cited. Polymers such as styrene and its substitutes; styrene-p-chlorostyrene copolymer, styrene-propylene copolymer, styrene-vinyltoluene copolymer, styrene-vinylnaphthalene copolymer, styrene-acrylic acid Methyl ester copolymer, styrene-ethyl acrylate copolymer, styrene-butyl acrylate copolymer, styrene-octyl acrylate copolymer, styrene-methyl methacrylate copolymer, styrene-ethyl methacrylate Copolymer, styrene-butyl methacrylate copolymer, styrene-α-chloromethyl methacrylate copolymer, styrene-acrylonitrile copolymer, styrene-vinyl methyl ketone copolymer, styrene- Styrene polymers such as butadiene copolymer, styrene-isoprene copolymer, styrene-acrylonitrile-indene copolymer, styrene-maleic acid copolymer, styrene maleate copolymer, etc. ...

Embodiment 1

[0465]

[0466] 1.0 kg of the carrier 1 prepared as described above was weighed, fed into a micro V-shaped mixer (manufactured by Tsutsui Rika Instrument Co., Ltd.), and the toner 1 was added so that the toner concentration was 7.5% by mass, Mixing was performed at 45 rpm for 30 minutes to prepare a two-component developer 1 .

Embodiment 2～16 and comparative example 1～4

[0467]

[0468] Two-component developers 2 to 20 were prepared in the same manner as in preparation of two-component developer 1 except that the combination of the carrier and the toner was changed to the combinations shown in Table 3 below.

[0469] "comment content"

[0470] [Evaluation 1: Minimum fixing temperature]

[0471] In the digital printer "bizhub PRES (registered trademark) C1070" (manufactured by Konica Minolta Corporation), the fixing device is modified so that the pressure and process speed (kneading time) of the kneading zone can be changed, and the fixing heating The surface temperature of the roll is modified so that it can be varied within the range of 100-210°C. The printing machine is equipped with two-component developers 1-20 respectively.

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Abstract

It is a two-component developer for electrostatic charge image development, which contains toner containing at least a binder resin and an external additive on a surface and a carrier containing a resin layer at least on a surface of a core material. The binder resin contains a crystalline polyester resin, the external additive contains alumina particles, and the resin layer contains a silicone resin.

Description

technical field [0001] The present invention relates to a two-component developer for electrostatic image development. Background technique [0002] In image output using the electrophotographic method, in recent years, from the standpoint of high speed and energy saving, it is required to fix toner images with less energy than before, and thus toners excellent in low-temperature fixability are required. In order to lower the toner fixing temperature, it is necessary to lower the melting temperature and melt viscosity of the binder resin constituting the toner. In order to achieve low-temperature fixing of toners, toners containing crystalline polyester resins as binder resins have been proposed. The crystalline polyester resin has a melting point and sharp meltability, and is advantageous from the viewpoint of ensuring the low-temperature fixability of the toner. [0003] However, although the inclusion of a crystalline polyester resin is advantageous in terms of low-temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08G03G9/10
CPCG03G9/08G03G9/10G03G9/08755G03G9/08797G03G9/09708G03G9/09716G03G9/0819G03G9/1136G03G9/1135
Inventor 柴田幸治小原慎也上田隼也高桥拓也
Owner KONICA MINOLTA INC
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