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Intermediate transfer medium, film forming liquid for the intermediate transfer medium and image forming apparatus using intermediate transfer medium

An intermediate transfer and medium technology, applied in transportation and packaging, chemical instruments and methods, synthetic resin layered products, etc., can solve the problems of image quality changes, affecting the secondary transfer process, and increasing the manufacturing cost of imaging devices

Inactive Publication Date: 2005-08-17
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The disadvantage of the first type of intermediate transfer medium is that charges formed thereon due to application of a transfer bias or friction between the intermediate transfer medium and other components affect the secondary transfer process, Therefore, it is necessary to provide a discharge device for this, resulting in an increase in the manufacturing cost of the imaging device
When such an intermediate transfer medium is used in an image forming method, there arises a problem that a change in toner transfer operation occurs, resulting in a change in image quality

Method used

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  • Intermediate transfer medium, film forming liquid for the intermediate transfer medium and image forming apparatus using intermediate transfer medium
  • Intermediate transfer medium, film forming liquid for the intermediate transfer medium and image forming apparatus using intermediate transfer medium
  • Intermediate transfer medium, film forming liquid for the intermediate transfer medium and image forming apparatus using intermediate transfer medium

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specific example

[0218] Specific examples thereof are as follows.

[0219] (1) A nuclear magnetic resonance (NMR) method, wherein the integral ratio (integral ratio) of the 1H amide group observed in the case of 9-11 ppm to the 1H amide group observed in the case of 6-9 ppm is determined. The conversion rate of imide;

[0220] (2) Fourier transform infrared spectrophotometry (ie FT-IR method);

[0221] (3) A method of determining water produced by imide ring formation; and

[0222] (4) A method for determining residual carboxylic acid by neutralization titration.

[0223] Among these methods, the FT-IR method is widely used. When using the FT-IR method, the conversion rate of imide is determined as follows.

[0224] Conversion rate of imide = (Mia / Mii) × 100

[0225] Where Mia represents the number of moles of imide groups determined in the heating step; Mii represents the number of moles of imide groups calculated assuming that the polyamic acid is completely converted into polyimide.

...

Embodiment 1

[0403] Preparation of Pigment Dispersion

[0404] The following ingredients were mixed and the mixture was heated to 70° C. using a water bath to completely dissolve the resin in the solvent.

[0405] 3 parts of styrene-acrylic acid-butyl acrylate copolymer

[0406] (acid value is 60mgKOH / g, weight average molecular weight is 13000)

[0407] Monoethanolamine 2 parts

[0408] 81 parts of N-methylpyrrolidone

[0409] Then 14 parts by weight of carbon black (COLOR BLACK S170 manufactured by Degussa A.G.) was added to the resin solution, and the mixture was premixed for 30 minutes. The mixture is then dispersed and processed under the following conditions:

[0410] Dispersing machine: SAND GRINDER (manufactured by Igrashi Machine Manufacturing Co., Ltd.)

[0411] Dispersion medium: zirconia beads with a particle size of 1 mm

[0412] Fill factor of dispersant: 50%

[0413] Dispersion time: 3 hours

[0414] Further, the dispersion was centrifuged at a speed of 12000 rpm f...

Embodiment 2

[0426]Preparation of Pigment Dispersion

[0427] The following ingredients were mixed and the mixture was heated to 70° C. using a water bath to completely dissolve the resin in the solvent.

[0428] 6 parts of styrene-maleic acid half ester-maleic anhydride copolymer

[0429] (acid value is 188mgKOH / g, weight average molecular weight is 15000)

[0430] 4 parts triethanolamine

[0431] 70 parts of N-methylpyrrolidone

[0432] Then 20 parts by weight of carbon black (PRINTEX U manufactured by Degussa A.G.) was added to the resin solution, and the mixture was premixed for 30 minutes. The mixture is then dispersed and processed under the following conditions:

[0433] Disperser: PEARL MILL (manufactured by Ashizawa Finetech Co., Ltd.)

[0434] Dispersion medium: glass beads with a particle size of 1 mm

[0435] Fill factor of dispersant: 50%

[0436] Liquid processing speed: 100ml / min

[0437] Further, the dispersion was centrifuged at a speed of 12000 rpm for 20 minutes ...

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Abstract

An intermediate transfer medium including a layer which includes an acidic carbon black including volatile components of from 3.5 to 8.0% by weight; at least one of a water soluble resin having a weight average molecular weight of from 3,000 to 30,000, and a resin dispersant having a weight average molecular weight of from 3,000 to 300,000 which is selected from the group consisting of polyamide acids, polyimides, and block copolymer including a unit containing at least one of a polyamide acid and a polyimide; and a binder resin, wherein a weight ratio (CB / R) of the carbon black (CB) to the at least one (R) of the water soluble resin and the resin dispersant is from 3 / 1 to 10 / 1. A film forming liquid for use in preparing the layer, and an image forming apparatus using the intermediate transfer medium are also provided.

Description

technical field [0001] The present invention relates to intermediate transfer media, such as intermediate transfer drums and belts, used in electrophotographic image forming apparatuses for image formation using primary and secondary image transfer processes. Furthermore, the present invention also relates to a film-forming liquid forming a layer or the entire intermediate transfer medium, and an electrophotographic image forming apparatus for forming a toner image using the intermediate transfer medium. Background technique [0002] Recently, electrophotographic image forming devices capable of producing full-color images have been commercialized. Among these color image forming devices, an image forming device employing a double transfer method (hereinafter referred to as an intermediate transfer method) in which an image bearing member (such as a photoreceptor) or a corresponding image bearing member is formed is widely used. Yellow (Y), magenta (M), cyan (C), and black ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B5/16B32B27/06G03G7/00G03G9/08G03G15/14G03G15/16
CPCG03G15/1685G03G7/004Y10T428/31721G03G7/0013Y10T428/25G03G7/0046
Inventor 有田均平野泰男
Owner RICOH KK
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