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Toner, toner collecting unit, image forming device and image forming method

A toner image and toner technology, applied in the field of toner, can solve the problems of stress resistance (deterioration of durability, decrease of resin chargeability, deterioration of background staining, etc.), and achieve excellent conjunctiva resistance, conjunctiva resistance low cost effect

Active Publication Date: 2017-12-29
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, even if the low-temperature fixability and crushability can be improved, since the bisphenol A skeleton is reduced, there is a concern that the stress caused by the toner when it is stirred in a developing device, etc., may cause deterioration, etc. Stress resistance (durability) Deterioration, or contamination of electrostatic latent image carriers (hereinafter also referred to as photoreceptors) and other components such as deterioration of conjunctival resistance
In addition, since the bisphenol A skeleton decreases, the chargeability of the resin decreases, or the hygroscopicity increases, so there is concern that the chargeability of the toner will decrease, background staining will worsen, and the toner will scatter.
That is, in this method, it is not sufficient to achieve excellent fixability, crushability, chargeability, stress resistance, conjunctival resistance, and blocking resistance.

Method used

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  • Toner, toner collecting unit, image forming device and image forming method
  • Toner, toner collecting unit, image forming device and image forming method
  • Toner, toner collecting unit, image forming device and image forming method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0214]

[0215]

[0216]After the mixture of the above composition is fully stirred and mixed with a Henschel mixer, it is heated and melted at a temperature of 130 to 140° C. with a roller mill for about 30 minutes. mesh size of 1.5 mm), and then pulverized and classified by a jet mill, a mechanical pulverizer, or a wind classifier to obtain a toner matrix with a volume average particle diameter of 6.8 μm. 0.5% by mass of hydrophobic silica was added to the obtained toner matrix and mixed to obtain a final toner.

Embodiment 2

[0218] In Example 1, the polyester resin A was changed to polyester resin B, the polyester resin G was changed to polyester resin H, and the metal (iron) azo compound (T-77) was changed to 3 parts, except that In the same manner as in Example 1, a toner was obtained.

Embodiment 3

[0220] A toner was obtained in the same manner as in Example 1 except that polyester resin A was changed to polyester resin C, and polyester resin G was changed to polyester resin I in Example 1.

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PUM

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Abstract

An object of the present invention is to provide a toner having low-temperature fixability, crushability, chargeability, adhesion resistance to copy, stress resistance, and resistance to filming, low cost, and high environmental safety.The toner contains at least a binder resin and has a maximum peak height W from a spectrum of the bisphenol A skeleton in a range of 1480 to 1520 cm -1 of a toner measured by an ATR method and a peak height W from a carbonyl group of 1700 to 1750 cm -1 (W / R) of the maximum peak height R of the spectrum is 0.20 to 0.70 and the absorption spectrum of the toner measured by the transmission method has a peak A between wavelengths of 350 and 390 nm by using a spectrophotometer Has a main peak in molecular weight distribution measured by GPC of from THF-soluble components in the toner, has a main peak, has a half width of a molecular weight distribution of 20,000 or less, a THF-insoluble content of 5-40 mass %..

Description

technical field [0001] The present invention relates to toner, a toner storage unit, an image forming apparatus, and an image forming method. Background technique [0002] Generally, toner used in electrophotographic copiers, printers, etc. is a mixture composed of a binder resin as a main component and various substances such as a colorant, a release agent, and a charge control agent. In the pulverized toner, the above-mentioned raw materials are usually melt-kneaded, and the melt-kneaded product is pulverized and classified to obtain a toner having a desired particle diameter. Among the raw materials constituting the toner, the ratio of the binder resin is usually 80 to 90% by mass, and most of the components in the toner are the binder resin. [0003] Recently, from the viewpoint of reducing power consumption and environmental load in copiers, the binder resin is generally a polyester resin that is easy to fix toner even at a low fixing temperature. In general, polyeste...

Claims

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Application Information

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IPC IPC(8): G03G9/08G03G9/087G03G9/097
CPCG03G9/08G03G9/0821G03G9/08755G03G9/097G03G9/09783
Inventor 守屋彻松下奈津子
Owner RICOH KK
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