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Electrostatic image developing toner and two-component developer

A technology for electrostatic image development and toner, which is applied in the directions of developers, electrographics, instruments, etc., can solve the problem of insufficient wax dispersion, retention, anti-offset separation resistance, high temperature storage and filming resistance improvement Insufficient and other problems, to achieve the effect of excellent storage and improved dispersion

Inactive Publication Date: 2011-09-21
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for toners for developing electrostatic latent images (also simply referred to as "toner"), especially for oil-free fixing devices suitable for use in fixing parts such as heating parts and pressing parts that do not require fixing oil Toner for oil fixing, when only the particle size of the wax is adjusted, there is the above limitation
For example, for a toner in which the particle size distribution peak of the wax is shifted toward a relatively small particle size, the amount of wax components with medium and large particle sizes is relatively small, so that there is a problem of insufficient improvement in paper separation and fixability at the time of oil-free fixing. question
In addition, for toners whose particle size distribution peaks of waxes are shifted toward larger particle sizes, there is a problem of maintaining a balance between improvements in paper separation and fixability and reduction in image noise in a completely oil-free fixing system
[0011] For toners in which polyolefin-based resins are added to the partial binder resin, the partial binder resin is modified to improve its affinity for wax; however, if a low-polarity paraffin is used, the dispersibility of the wax Insufficient, so that as in the case of the above-mentioned toner, there are toner properties such as offset resistance, separation between recording paper and fixing member, high-temperature storage, and filming resistance caused by the dispersibility of wax The problem of insufficient improvement

Method used

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  • Electrostatic image developing toner and two-component developer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0145]

[0146] Into the reaction kettle equipped with cooling tube, stirrer and nitrogen gas introduction tube, pour 690 parts of bisphenol A ethylene oxide (2mol) adduct and 335 parts of terephthalic acid, make it in the normal pressure nitrogen flow The condensation reaction was carried out at 210°C for 10 hours. Thereafter, while removing water under a reduced pressure of 10 mmHg to 15 mmHg, the reaction was continued for 5 hours, followed by cooling, whereby polyester (1) was obtained. The obtained polyester (1) had a weight average molecular weight of 6,000 and an acid value of 10 KOHmg / g and a glass transition temperature of 48°C.

[0147]

[0148] The following components were poured into a reaction kettle equipped with a cooling pipe, a stirrer and a nitrogen gas introduction pipe, and allowed to undergo a condensation reaction at 210° C. for 8 hours in an atmospheric nitrogen flow.

[0149]

[0150]Next, while removing water under a reduced pressure of 10 mmH...

Embodiment 2

[0163]

[0164] Into a reaction kettle equipped with a cooling pipe, a stirrer, and a nitrogen gas introduction pipe, 622 parts of hydroxyl-terminated polybutadiene (product name: POLY BD R-15HT, manufactured by Idemitsu Kosan Co., Ltd., number average molecular weight : 1,200, hydroxyl value: 102.7 mg KOH / g) and 378 parts of terephthalic acid were subjected to condensation reaction at 200° C. for 9 hours in a nitrogen stream at normal pressure. Then, while removing water under a reduced pressure of 10 mmHg to 15 mmHg, the reaction was continued for 5 hours, and then cooled, thereby obtaining a resin (2) having a polyolefin skeleton (hereinafter referred to as "polyolefin skeleton-containing resin (2)") . The obtained polyolefin skeleton-containing resin (2) had a weight average molecular weight of 1,830.

[0165] Subsequently, pour 660 parts of bisphenol A ethylene oxide (2mol) adducts and 340 parts of terephthalic acid into a reaction kettle equipped with a cooling pipe, ...

Embodiment 3

[0170]

[0171] The production process was implemented in the same manner as in Example 1, except that 14.3 parts of prepolymer (1), 54 parts of polyester (1) and 1.1 parts of block copolymer (2) were mixed into 78.6 parts of ethyl acetate, and then Stir and dissolve, then add 6.0 parts of paraffin wax as a release agent, 4 parts of copper phthalocyanine blue pigment, and 2 parts of organically modified montmorillonite. Thus, toner (3) was obtained.

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Abstract

The present invention provides an electrostatic image developing toner capable of improving the dispersibility of wax in the toner and superior in offset resistance and in storageability (heat-resistant storageability) at high temperatures, and a two-component developer which uses this electrostatic image developing toner. The electrostatic image developing toner includes: a binder resin, a colorant, and a release agent, wherein the binder resin contains a polyester resin, and a block copolymer which has a polyolefin backbone unit.

Description

technical field [0001] The present invention relates to an electrostatic image developing toner and a two-component developer. Background technique [0002] In electrophotographic image forming apparatuses, a contact type thermal fixing method such as a heat roller fixing method is widely used. Such as figure 1 As shown, a fixing device 10 for the heat roller fixing method includes a heat roller 11 and a pressure roller 12; The unfixed image is fused and fixed on the recording paper 21 at the portion (nip portion) that is in contact with each other under pressure. [0003] The problem with the contact type thermal fixing method typified by the thermal roller fixing method is that since the unfixed toner image on the recording paper 21 is brought into contact with the surface of the heating member such as the heating roller 11, the unfixed toner image to be fixed on the recording paper 21, so that part of the unfixed toner adheres to the heating roller 11, and when the hea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/087G03G9/08
CPCG03G9/08797G03G9/0819G03G9/08755G03G9/08782G03G9/08795G03G9/08788G03G9/0804G03G9/0827G03G9/08G03G9/087
Inventor 唐户敏彦山田雅英粟村顺一铃木智美
Owner RICOH KK
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