Toner, development agent, toner container, and image forming apparatus

A toner and colorant technology, which is applied in the field of image forming devices, can solve the problems of image quality deterioration, heat-resistant storage or fixability reduction, base soiled images, etc., and achieve good heat-resistant storage and fixability, The effect of suppressing the deterioration of image quality and maintaining the coating effect for a long time

Inactive Publication Date: 2014-05-07
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Conventionally, the surface modification technology of imparting the required characteristics by attaching (externally adding) fine particles to the surface of the toner base particles has been used. In such external additive modification, pressure or stress from the outside Causes phenomena such as detachment or burial of attached particles, and changes in surface properties accompanying the above phenomena, resulting in changes in physical properties of toner, reduced heat-resistant storage or fixability, or caused properties such as charge amount, fluidity, and degree of aggregation As a result, image quality may deteriorate (e.g., poor transfer, dirty images, etc.)

Method used

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  • Toner, development agent, toner container, and image forming apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0260] [Developer X1]

[0261] (Toner master particle A) 100 parts, and 0.75 parts of rutile-type titanium oxide treated with isobutyl with an average particle diameter of 15 nm. In the Henschel mixer, the peripheral speed of the stirring blade is 35 m / s mixed under conditions. Thereafter, 3 parts of resin fine particles AA having a silica layer formed on the surface were mixed in a Henschel mixer at a peripheral speed of a stirring blade of 35 m / sec to prepare [Toner X1]. [Toner X1] The shape factor (SF) of the resin fine particle AA when attached to the surface of the toner mother particle fine particle A was 1.23. It is reported together with the value of SF in Table 1 described below.

[0262] 7 parts of [Toner X1] thus obtained and 93 parts of [Carrier] were mixed and stirred to prepare [Developer X1] having a toner concentration of 7% by weight.

Embodiment 2

[0264]In Example 1, the peripheral speed of the stirring blade of the Henschel mixer was changed from 35 m / sec to 55 m / sec, and the same procedure as in Example 1 was obtained except that the resin fine particles AB for forming the silica layer were mixed [Toner X2]. [Toner X2] The shape factor (SF) of the resin fine particle AA when attached to the surface of the toner mother particle fine particle A was 1.41. It is reported together with the value of SF in Table 1 described below. 7 parts of [Toner X2] thus obtained and 93 parts of [Carrier] were mixed and stirred to prepare [Developer X2] having a toner concentration of 7% by weight.

Embodiment 3

[0266] In Example 2, [Toner X3] was obtained by the same procedure as in Example 2, except that the silica layer-forming resin particles AA were changed to using the silica layer-forming resin particles BB. [Toner X3] The shape factor (SF) of the resin fine particle BB when attached to the surface of the toner mother particle fine particle A was 1.36. It is reported together with the value of SF in Table 1 described below. 7 parts of [Toner X3] thus obtained and 93 parts of [Carrier] were mixed and stirred to prepare [Developer X3] having a toner concentration of 7% by weight.

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PUM

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Abstract

The invention relates to a toner, a development agent, a toner container, and an image forming apparatus for electrophotography. Provided is a toner that is endurable to an external force, does not disengage with, move or bury an external additive, has excellent heat preservation and fixation performance, can inhibit changes in characteristics such as charge amount, mobility, agglutination degree and inhibit image quality degradation, a development agent using the toner, a development agent container, and an image forming apparatus. The toner is composed of a mother toner particle containing a binder resin and a coloring agent, and an external additive to cover the mother toner particle, wherein the external additive contains a resin particle which has an outer shell layer formed of silica or modified silica; the resin particle has a non-spherical form with a shape factor (SF) of 1.20 or greater as calculated by the following formula (I): Shape factor(SF)=[(Absolute maximum length of particle)2 / Projected area of particle)]([pi] / 4).

Description

technical field [0001] The present invention relates to a toner for electrophotography, a developer using the toner, a toner storage container, and an image forming device. Background technique [0002] Conventionally, fine particles with an average primary particle diameter of several nm to tens of nm have been used as external additives for toners for developing electrostatic latent images (toners for electrophotography). In general, hydrophobized silica particles are generally used. From the perspective of maintaining chargeability under temperature / humidity conditions and suppressing changes in the amount of charge maintained, titanium oxide, etc. that have been treated with a hydrophobized surface is generally used. In recent years, large-diameter particles represented by large-diameter silica have begun to be used as additives. [0003] As an external additive of the toner, by adding hydrophobized silica, metal oxide, etc., it is possible to impart fluidity, chargeab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08G03G15/08G03G15/00
CPCG03G9/09364G03G9/08G03G9/09321G03G9/09342G03G9/09371
Inventor 石井雅之泽田丰志
Owner RICOH KK
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