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Toner, image forming apparatus, image forming method, and toner accommodating unit

一种调色剂像、调色剂的技术，应用在调色剂领域，能够解决半色调图像浓度不均、结晶速度缓慢、调色剂弹性回复变慢等问题，达到堆积性优异、低温定影性优异的效果

Inactive Publication Date: 2020-07-28
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The occurrence of back-end shift, the occurrence of density unevenness in halftone images, and the occurrence of fogging after being left in a high-temperature and severe environment are specified for the purpose of effectively suppressing these. Such toners are known, but there is no mention of the following problems: if CPES with a slow crystallization rate is used, or if a large amount of CPES is introduced into the toner, the elastic recovery of the toner after fixing becomes slow, Or there is a problem that the toner fixed on the paper adheres to other unfixed paper (piling up) (for example, refer to Patent Document 3)

Method used

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  • Toner, image forming apparatus, image forming method, and toner accommodating unit
  • Toner, image forming apparatus, image forming method, and toner accommodating unit
  • Toner, image forming apparatus, image forming method, and toner accommodating unit

Examples

Experimental program
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preparation example Construction

[0150] The preparation of the aqueous medium phase is carried out, for example, by dispersing the resin particles in the aqueous medium in the presence of a surfactant. The reason for properly adding the surfactant, the resin particles, etc. to the aqueous medium is to ensure good dispersion of the toner material.

[0151] The addition amount of the surfactant and the fine resin particles to the aqueous medium is not particularly limited, and can be appropriately selected according to the purpose, and is preferably 0.5% by mass to 10% by mass relative to the aqueous medium.

[0152] The surfactant is not particularly limited and may be appropriately selected according to the purpose, and examples thereof include anionic surfactants, cationic surfactants, and amphoteric surfactants.

[0153] Examples of the anionic surfactants include fatty acid salts, alkyl sulfate ester salts, aryl sulfonates, alkyl diaryl ether disulfonates, dialkyl sulfosuccinates, alkyl Phosphate, naphtha...

Embodiment 1

[0282]

[0283] In a container equipped with a thermometer and a stirrer, add 85 parts of [amorphous resin A2], 9 parts of [amorphous resin B1], and 94 parts of ethyl acetate with a crosslink density of 0.73 mmol / g, and heat to Above the melting point of the resin, to make it dissolve well, add 25 parts of [wax dispersion liquid] and 12 parts of [colorant masterbatch P1], as an extender, bis(3-ethyl-5-methyl-4 - Maleimide phenyl) methane is set to 1 / 4 mol equivalent relative to the crosslinking point, and 7 parts (85×0.73 / 1000 / 4×442) are added.

[0284] The mixture was stirred at 50° C. with a TK-type homomixer (manufactured by Tokuji Kagaku Co., Ltd.) at a rotation speed of 10,000 rpm to uniformly dissolve and disperse it, thereby obtaining [Oil Phase 1].

[0285] Next, add 75 parts of ion-exchanged water to another container equipped with a stirrer and a thermometer, and disperse and stabilize organic resin particles (styrene-methacrylic acid-butyl acrylate-methacrylic aci...

Embodiment 2～4

[0295] (Examples 2-4, Comparative Examples 1-2)

[0296] In the production process of the oil phase of the toner in Example 1, the operation was the same as in Example 1 except that the types and ratios of the amorphous resin and the elongating agent were changed as shown in Table 2 below. The viscoelasticity results of the obtained toners are shown in Table 2 below.

[0297] Table 2

[0298]

[0299] 7 ) Determination>

[0300] The viscoelasticity (storage modulus) of the obtained toner was measured by the following method. The measurement results are shown in Table 1.

[0301] The storage modulus was measured using a dynamic viscoelasticity measuring device (ARES, manufactured by TA Instruments). The obtained toner was molded into particles with a diameter of 8 mm and a thickness of 1 mm to 2 mm. After being fixed on a parallel plate with a diameter of 8 mm, it was stabilized at 40° C., with a frequency of 1 Hz (6.28 rad / s) and a strain of 0.1% (strain). control mode...

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PUM

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Abstract

The invention relates to a toner, an image forming apparatus, an image forming method, and a toner storage unit. The present invention addresses the problem of providing a toner capable of achieving both excellent low-temperature fixability and excellent buildup. The toner of the present invention contains a binder resin, a colorant, and a release agent. The toner has a storage modulus G'obtainedin dynamic viscoelasticity measurement of the toner, and a storage modulus G' obtained in dynamic viscoelasticity measurement of the toner. G'(50) is the storage modulus at 50 DEG C; when G'(80) is the storage modulus at 80 DEG C and T (107) is the temperature at which G' is 107 Pa or more when cooling from 100 DEG C to 30 DEG C, the following relational expressions (1) and (2) are satisfied: 3.0*10<2> <= G'(50) / G'(80) (1), T(107)>= 75 DEG C (2).

Description

technical field [0001] The present invention relates to toner, an image forming apparatus, an image forming method, and a toner storage unit. Background technique [0002] In recent years, in the market, it is required to improve the low-temperature fixability of the toner in order to save energy. In order to explore low-temperature fixability, the glass transition temperature of the binder resin can be lowered to make it easy to plastically deform, but there is a balance relationship with heat-resistant storage. Therefore, in order to achieve the above-mentioned low-temperature fixability of the toner, many toners have been proposed in which viscoelasticity is controlled by using a combination of a crystalline resin and an amorphous resin as a binder resin (for example, refer to Patent Document 1). [0003] However, in these toners, if the crystalline resin is exposed on the surface of the toner, aggregates of toner particles will be generated due to stirring stress in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08G03G9/087
CPCG03G9/0821G03G9/087G03G9/08793G03G9/08795G03G9/08797G03G9/08755G03G9/08791G03G9/0904G03G15/0865
Inventor 根本太一
Owner RICOH KK
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