Image forming apparatus, image forming method and process cartridge

An image and developing device technology, applied in corona discharge device, electric recording process applying charge pattern, electric recording process applying charge pattern, etc., can solve the problem of excessive crushing, poor storage, and poor productivity And other issues

Active Publication Date: 2008-03-05
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] However, in the method of blending a low-molecular-weight resin and a high-molecular-weight resin in the above-mentioned Japanese Patent Application Laid-Open No. 2-82267, there is a disadvantage that the presence of a high-molecular-weight component causes pulverization in the resin production process, or the use of The crushability of the binder resin in the production process of the crushed toner is deteriorated
On the other hand, in the method of using only low-molecular-weight resin, not only the offset resistance and storability are poor, but also the pulverization is too good, so there is a problem that the resin is

Method used

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  • Image forming apparatus, image forming method and process cartridge
  • Image forming apparatus, image forming method and process cartridge
  • Image forming apparatus, image forming method and process cartridge

Examples

Experimental program
Comparison scheme
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Embodiment

[0611] Hereinafter, examples of the present invention will be described, but the present invention is not limited in any way by the following examples.

[0612] In the following examples and comparative examples, "softening point of polyester resin", "glass transition temperature (Tg) of polyester resin", "softening point of rosin", "acid value of polyester resin and rosin" "The hydroxyl value of the polyester resin", the "content of the low molecular weight component with a molecular weight of 500 or less", the "SP value of the rosin", and the "modification degree of (meth)acrylic acid of the rosin" were measured by the following methods.

[0613]

[0614] Using a flow tester (manufactured by Shimadzu Corporation, CFT-500D), 1 g of each polyester-based binder resin as a sample is heated at a temperature increase rate of 6°C / min, while a plunger provides a load of 1.96 MPa, It was extruded from a nozzle with a diameter of 1 mm and a length of 1 mm to create a curve of the plunger...

Synthetic example 1

[0644] —The refining of rosin —

[0645] 1,000g of tall oil rosin was put into a 2000mL distillation flask equipped with a fractionating tube, reflux condenser and receiving vessel, and distilled under a reduced pressure of 1kPa, and distilled components at 195°C to 250°C were collected as the main fraction . Hereinafter, the tall oil rosin used for purification is regarded as unrefined rosin, and the rosin collected as the main fraction is regarded as refined rosin.

[0646] Using a coffee pulverizer (National MK-61M), each 20 g of rosin was pulverized for 5 seconds, and 0.5 g of the substance passed through a sieve with an aperture of 1 mm was measured and put into a vial (20 mL) for headspace. Headspace gas was sampled, and the impurities in unrefined rosin and refined rosin were analyzed by the headspace GC-MS method in the following manner. The results are shown in Table 1A.

[0647]

[0648] A. Headspace sampler (manufactured by Agilent, HP7694)

[0649] ·Sample temperature...

Synthetic example 2

[0680] —Synthesis of Acrylic Modified Rosin A—

[0681] 6084g (18mol) of refined rosin (SP value: 76.8°C) and 907.9g (12.6mol) of acrylic acid were added to a 10L flask equipped with a fractionating tube, reflux condenser and receiving vessel, and the temperature was changed from within 8 hours The temperature was raised from 160°C to 220°C and reacted at 220°C for 2 hours, followed by distillation under reduced pressure of 5.3 kPa to obtain acrylic modified rosin A. The SP value of the obtained acrylic modified rosin A was 110.4°C, and the degree of acrylic acid modification was 100.

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Abstract

Provided are image forming apparatuses, image forming methods, and process cartridges using a toner that is excellent in low temperature fixing ability, hot offset resistance, and storage stability, and also generate less odor, and thus that can provide high quality images with superior fixing ability, far from tone change with time, and less likely to occur abnormal images such as density-drop and background smear. The image forming apparatuses comprise a latent electrostatic image bearing member, a charging unit, an exposing unit, a developing unit, a transfer unit, and a fixing unit, wherein the toner comprises a binder resin and a colorant, the binder resin comprises a polyester resin prepared by condensation polymerization between an alcohol component that contains an aliphatic polyvalent alcohol and a carboxylic acid component that contains (meth)acrylic acid-modified rosin.

Description

Technical field [0001] The present invention relates to electrophotographic image forming apparatuses, image forming methods, and processing cartridges of copiers, electrostatic printing, printers, facsimile machines, electrostatic recording, etc. Background technique [0002] At present, there are many known methods for image formation in the electrophotographic method. Usually, the surface of an electrostatic latent image carrier (hereinafter also referred to as "photoreceptor", "electrophotographic photoreceptor", "image carrier") is charged, and then The surface of the charged electrostatic latent image carrier is exposed to form an electrostatic latent image. Next, the electrostatic latent image is developed with toner to form a visible image on the electrostatic latent image carrier. The visible image is transferred to the recording medium directly or through an intermediate transfer body, and then the transferred image is fixed by heating, pressurizing, or both, thereby ob...

Claims

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Application Information

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IPC IPC(8): G03G15/00G03G9/09G03G9/087G03G9/08G03G15/02G03G15/08G03G15/16G03G15/20G03G13/00G03G21/18
Inventor 岩本康敬渡辺阳一郎设乐泰祯
Owner RICOH KK
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