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WO2008075857A1 - Courroie de transfert intermédiaire et son procédé de fabrication - Google Patents

Courroie de transfert intermédiaire et son procédé de fabrication Download PDF

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Publication number
WO2008075857A1
WO2008075857A1 PCT/KR2007/006538 KR2007006538W WO2008075857A1 WO 2008075857 A1 WO2008075857 A1 WO 2008075857A1 KR 2007006538 W KR2007006538 W KR 2007006538W WO 2008075857 A1 WO2008075857 A1 WO 2008075857A1
Authority
WO
WIPO (PCT)
Prior art keywords
intermediate transfer
transfer belt
surface resistivity
mold
polyamic acid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2007/006538
Other languages
English (en)
Inventor
Hyo Jun Park
Sang Min Song
Chung Seock Kang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kolon Industries Inc
Original Assignee
Kolon Industries Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kolon Industries Inc filed Critical Kolon Industries Inc
Priority to JP2009542636A priority Critical patent/JP2010513978A/ja
Publication of WO2008075857A1 publication Critical patent/WO2008075857A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
    • G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
    • G03G15/1605—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support
    • G03G15/162—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support details of the the intermediate support, e.g. chemical composition
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base

Definitions

  • the present invention relates to an intermediate transfer belt for use in a laser printer, a fax machine, or a copier, and a method of manufacturing the same.
  • an intermediate transfer belt for a laser printer, a fax machine, or a copier should have excellent properties of heat dissipation, water repellency, oil repellency, contamination resistance, heat resistance, modulus, releasability from paper, antistatic properties, and durability.
  • the intermediate transfer belt is required to have volume resistivity suitable for transferring toner. If the transfer belt has volume resistivity lower or higher than required, properties thereof, including antistatic properties, transfer properties, imaging properties, releasability, and contamination resistance, are deteriorated, whereby critical defects, such as poor images, may occur.
  • a conventional process for decreasing the difference in the surface resistivity includes antistatic coating or polishing the inner surface or outer surface of the intermediate transfer belt such that the surface resistivity is adjusted, but is disadvantageous because it is complicated.
  • additional antistatic coating complicates the manufacturing process and increases the manufacturing cost, and as well, causes layer separation between the antistatic coating layer and the belt or scratching of the coating layer, adversely affecting the quality of an image to be realized.
  • the intermediate transfer belt for a laser printer, a fax machine, or a copier functions to transfer the toner, and thus should be manufactured to be seamless .
  • the present invention provides an intermediate transfer belt, which is manufactured from a polyimide compound and has a low difference in surface resistivity between the inner surface and the outer surface thereof, thus exhibiting improved operating properties, and a method of manufacturing the same.
  • the present invention provides an intermediate transfer belt, which is seamless and has a uniform thickness, and a method of manufacturing the same.
  • a polyimide-based intermediate transfer belt which is not subjected to additional surface treatment and has a surface resistivity ratio of outer surface resistivity to inner surface resistivity in a range of 10 ⁇ 2 ⁇ 10 2 .
  • the intermediate transfer belt according to the first embodiment may have thickness variation of 7% or less, volume resistivity of 10 5 ⁇ 10 12 ⁇ cm, and a modulus of 3.0-7.0 GPa.
  • a method of manufacturing a polyimide-based intermediate transfer belt comprising applying a polyamic acid solution on the outer surface of a mold using rollers; and subjecting the applied polyamic acid solution to heat treatment for imidization.
  • a number of the rollers may be two or more.
  • the polyamic acid solution may contain 0.5-20 wt% of an electrically conductive filler based on the total amount of a solute.
  • the heat treatment for imidization may be conducted at 60 ⁇ 450 ° C.
  • the present invention may provide an intermediate transfer belt, which is manufactured from a polyimide compound and has decreased difference in surface resistivity between the inner surface and the outer surface thereof, even without the application of additional treatment, such as antistatic coating, thus realizing improved operating properties, and also provides a method of manufacturing the same.
  • the present invention may provide an intermediate transfer belt, which is seamless and has a uniform thickness thanks to the minimization of thickness variation, and also provides a method of manufacturing the same .
  • FIG. 1 is a schematic perspective view illustrating a process of manufacturing an intermediate transfer belt according to the present invention.
  • polyimide resin is obtained by dissolving dianhydride, diamine, and an electrically conductive filler in a solvent, thus preparing a polyamic acid solution, which is then applied on the outer surface of a mold using a roller, followed by heat treatment for imidization.
  • the surface resistivity ratio theieof is preferably in the range of 10 ⁇ 2 ⁇ 10 2 .
  • the surface resistivity ratio may be calculated by Equation 1 below:
  • the surface resistivity ratio exceeds 10 2 , it is difficult to control the resistivity of an intended region of the intermediate transfer belt, and volume resistivity varies, and thus the belt is difficult to operate at the time of realizing an image.
  • the surface resistivity ratio is less than 10 ⁇ 2 , the outer surface of the belt has low resistivity to applied voltage, and developing fillers, such as toner, are not well fused thereon.
  • an intermediate transfer belt satisfying the surface resistivity ratio in the aforementioned range, not only monomers for polyimide resin constituting the intermediate transfer belt, but also the electrically conductive filler, greatly affecting electrical conductivity, are uniformly dispersed. Thus, when applied to a printer or a copier, an intermediate transfer belt may realize good development performance.
  • the diamine is not particularly limited, as long as it is typically used to prepare polyimide resin, and examples thereof include 4, 4' -oxydianiline (ODA), para-phenylene diamine (pPDA) , meta-phenylene diamine (mPDA) , para-methylene diamine (pMDA) , and meta-methylene diamine (mMDA) .
  • ODA 4, 4' -oxydianiline
  • pPDA para-phenylene diamine
  • mPDA meta-phenylene diamine
  • pMDA para-methylene diamine
  • mMDA meta-methylene diamine
  • the dianhydride is not particularly limited as long as it is typically used to prepare a polyimide resin, and examples thereof include 1, 2, 4, 5-benzene tetracarboxylic dianhydride (pyromellitic acid dianhydride, PMDA), 3,3,4,4- benzophenone tetracarboxylic dianhydride (BTDA), 3,3,4,4- biphenyl tetracarboxylic dianhydride (BPDA), and 4,4- oxydiphthalic dianhydride.
  • PMDA 1, 2, 4, 5-benzene tetracarboxylic dianhydride
  • BTDA 3,3,4,4- benzophenone tetracarboxylic dianhydride
  • BPDA 3,3,4,4- biphenyl tetracarboxylic dianhydride
  • 4,4- oxydiphthalic dianhydride 4,4- oxydiphthalic dianhydride.
  • the diamine and the dianhydride may be used in equivalent molar amounts .
  • the solvent may be selected from among highly polar aprotic solvents, such as N,N-dimethylformamide (DMF), dimethylacetamide (DMAc) , and N-methylpyrrolidinone (NMP) .
  • the electrically conductive filler which functions to control the volume resistivity of the intermediate transfer belt, is added when the polyamic acid solution is prepared.
  • the electrically conductive filler one or a mixture of two or more selected from among Ketjen black, acetylene black, furnace black, or conductive or semi-conductive powder, including metal such as aluminum or nickel, metal oxide such as tin oxide, or potassium titanate, or conductive polymers, such as polyaniline or polyacetylene, may be used in an amount of 0.5 ⁇ 35 wt% based on the total amount of a solute, in order to attain desired electrical conductivity.
  • a metal filler may be additionally contained in an amount of 0.1-5 wt% based on the total amount of a solute.
  • a dispersion stabilizer is a polymer dispersant, examples thereof including poly-N-vinyl formamide, poly-N-vinyl acetamide, poly-N-vinyl pyrrolidone, and poly-N-vinyl caprolactam.
  • the dispersant may be variously used depending on the type of dispersion solution.
  • the reaction for the preparation of the polyamic acid solution to obtain the polyimide resin is conducted at
  • the polyamic acid solution thus prepared is applied on the outer surface of a mold using rollers, and is then subjected to heat treatment for imidization, thereby obtaining a polyimide-based intermediate transfer belt.
  • two or more rollers are used to manufacture the intermediate transfer belt having the aforementioned surface resistivity ratio.
  • a description is given in greater detail with reference to the appended drawing.
  • FIG. 1 is a schematic perspective view illustrating the process of manufacturing the intermediate transfer belt according to the present invention.
  • a polyamic acid solution 4 is applied on the outer surface of a mold 3 using rollers 1, 2, and is then subjected to heat treatment for imidization, thereby manufacturing an intermediate transfer belt.
  • the rollers 1, 2 are located parallel to the mold 3, and two rollers 1, 2 and the mold 3 are rotated in a state in which they are engaged with each other.
  • the second roller 2 is rotated in a counterclockwise direction and the mold 3 is rotated in a clockwise direction.
  • the first roller 1 is brought into contact with the polyamic acid solution 4.
  • the polyamic acid solution 4 is applied on the first roller 1, and the applied solution 4 is sequentially applied on the second roller 2, which is rotated in a state of being brought into contact with the first roller 1.
  • the solution 4 is applied on the outer surface of the mold 3, which is rotated in a state of being brought into contact with the second roller 2.
  • the polyamic acid solution 4 is applied on the mold 3 through a plurality of rollers 1, 2, thereby adjusting the amount and thickness of the polyamic acid solution that is applied.
  • the polyamic acid solution 4 is applied such that an intermediate transfer belt formed on the mold 3 through heat treatment is 40-200 ⁇ m thick.
  • the thickness variation is preferably 7% or less. In the case where the thickness variation exceeds 7%, the polyamic acid solution 4 is imidized, and then the thickness variation of the film is increased, undesirably deteriorating the development performance of the intermediate transfer belt.
  • the solution 4 is intensively applied toward the wider sides of the gaps between the first roller 1 and the second roller 2 and between the second roller 2 and the mold 3, resulting in considerably non-uniform application thickness, and also, it is difficult to efficiently rotate the rollers and the mold with each other.
  • the rotation speed and the rotation time of the rollers 1, 2 and the mold 3 are not adjusted, the polyamic acid solution 4 is intensively applied between the first roller 1 and the second roller 2, and thus may not be applied on the mold 3, and also, the thickness variation may be increased. So, it should be noted that the rotation speed and the rotation time can be adjusted. In consideration thereof, the rotation speed of the rollers 1, 2 and the mold 3 is set to 50-200 rpm, and the rotation time is set to 1-4 hours.
  • the mold 3 may be formed of alumina, stainless steel, or Teflon, and the size thereof is not particularly limited, but has a length of 200-300 mm and an inner diameter of 100-150 mm.
  • the polyamic acid solution 4, which is applied on the mold 3, is subjected to stepwise heat treatment and is then separated from the mold 3, thus manufacturing the polyimide-based intermediate transfer belt.
  • the stepwise heat treatment may be conducted using an IR heater, an electrical furnace, or a hot air oven, and includes pre- baking at 50-100 ° C to primarily remove the solvent and moisture from the surface of the belt and then final post- curing at 350 ⁇ 400 ° C at a heating rate of 2 ⁇ 10 ° C per minute to completely remove the solvent and moisture from the surface and the inside of the belt such that imidization progresses, thereby completing a solidified film.
  • the belt may be separated from the mold, turned inside out, fitted on a mold having a smaller size, and post-cured, as necessary.
  • the rotation of the mold 3 for adjusting the thickness of the intermediate transfer belt is minimized, thereby decreasing the thickness variation and reducing the difference in surface resistivity between the outer surface and the inner surface of the intermediate transfer belt.
  • the surface resistivity ratio of the outer surface resistivity to the inner surface resistivity is in the range of 10 ⁇ 2 ⁇ 10 2 , and also, the thickness variation is 7% or less, thus realizing an intermediate transfer belt exhibiting superior insulating properties and development performance.
  • the intermediate transfer belt thus obtained has volume resistivity of 10 5 ⁇ 10 12 ⁇ cm, which is classified as a medium intrinsic resistivity value, resulting in an intermediate transfer belt for use in a laser printer, a fax machine, or a copier, which has improved antistatic properties and printability and is semi-conductive.
  • the transfer belt of the present invention has a modulus of 3.0-7.0 GPa, and preferably 3.2-5.0 GPa.
  • the modulus When the modulus is low, the intermediate transfer belt may be mechanically deformed upon extended use. On the other hand, when the modulus is high, the intermediate transfer belt is stiff and difficult to mold.
  • Ketjen black was added to 1007 g of DMF and dispersed using an ultrasonic homogenizer, after which 118 g of BPDA and 80 g of ODA were added thereto and dispersed using an ultrasonic homogenizer.
  • the dispersion solution was reacted at room temperature, thus preparing a polyamic acid solution containing electrically conductive filler.
  • the viscosity of the solution was 1950 poise at 23 ° C.
  • the polyamic acid solution was applied on the outer surface of a cylindrical mold as shown in FIG. 1, pre-baked at 80 ° C to primarily remove the solvent and moisture from the surface of the belt, and finally post- cured at 350 ° C at a heating rate of 5 ° C per minute to completely remove the solvent and moisture from the surface and the inside of the belt, thus manufacturing a polyimide- based intermediate transfer belt which is seamless and contains electrically conductive filler.
  • the thickness of the belt thus manufactured was 65 ⁇ m.
  • a polyamic acid solution was prepared, applied on the mold, and then pre-baked, in the same manner as in Example
  • the thickness of the belt thus manufactured was 63 ⁇ m.
  • Ketjen black was added to 1007 g of DMF and dispersed using an ultrasonic homogenizer, after which 118 g of BPDA and 80 g of ODA were added thereto and dispersed using an ultrasonic homogenizer.
  • the dispersion solution was reacted at room temperature, thus preparing a polyamic acid solution containing electrically conductive filler.
  • the viscosity of the solution was 1840 poise at 24 ° C.
  • the polyamic acid solution was applied on the inner surface of a cylinder having an inner diameter of 120 mm and a length of 250 mm, rotated at 1200 rpm for 20 min, treated under the same conditions as Example 1 to remove the solvent, and post-cured, thus manufacturing a polyimide-based intermediate transfer belt.
  • the thickness of the belt thus manufactured was 71 ⁇ m.
  • a polyamic acid solution was prepared as in Comparative Example 1, loaded into a cylindrical Teflon mold having a double structure comprising an outer cylinder and an inner cylinder, and pre-baked at 80 ° C to primarily remove the solvent and moisture from the surface of the belt, after which the inner cylinder was removed from the outer cylinder.
  • the voltage applied to the sample was 100 V.
  • the surface resistivity was measured in a manner such that the sample was placed on a substrate formed of a fluorinated polymer having high insulating properties, and the inner surface resistivity and the outer surface resistivity of the sample were separately measured at intervals of 10 sec. As such, a ring probe was used.
  • the size of the sample used for measuring the surface resistivity was 20 cm X 20 cm, and 10 measurements were conducted on the corresponding surface and averaged. The obtained values were substituted into
  • Equation 1 thus calculating the surface resistivity ratio.
  • the modulus of the intermediate transfer belt was measured according to ASTM D882 using a universal testing machine, Model 1000, available from Instron. (4) Thickness and Thickness Variation
  • the sample was dried at 100 ° C for 1 hour, and the thickness thereof was measured using a micrometer (Anritus, Electronic micrometer) .
  • the thickness of the sample was determined by conducting 50 measurements and averaging the measured values other than the maximum and the minimum.
  • the thickness variation was determined according to a general thickness variation equation, and was represented by %. (5) Development performance
  • Each of the intermediate transfer belts manufactured in the examples and comparative examples was applied to a transfer unit and then connected to a color laser printer, after which the same image was repeatedly transferred.
  • the state of the developed paper image was determined by checking the number of defects. Upon 1000 developments, the case where the number of defects was 10 or less was indicated as “very good”, the case where the number of defects exceeded 10 but was 30 or less was indicated as “good”, the case where the number of defects exceeded 30 but was 50 or less was indicated as "fair”, the case where the number of defects exceeded 50 but was 100 or less was indicated as "poor”, and the case where the number of defects exceeded 100 was indicated as "very poor".
  • the intermediate transfer belts of the examples manufactured through the manufacturing method of the present invention had a surface resistivity ratio of 4.23 and 2.17, and thus, the difference in the surface resistivity between the inner surface and the outer surface thereof was very low, from which the filler could be confirmed to be uniformly dispersed. Further, because the thickness variation was 7% or less, the intermediate transfer belt of the present invention had a relatively uniform thickness and thus exhibited good development performance.
  • the intermediate transfer belts of the comparative examples had a surface resistivity ratio of 10 2 or more, and thus, the difference in the surface resistivity between the inner surface and the outer surface thereof was large, and the thickness variation exceeded 7%, resulting in deteriorated development performance.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)

Abstract

La présente invention concerne une courroie de transfert intermédiaire destinée à être utilisée dans une imprimante laser, une télécopieuse, ou un duplicateur, fabriquée à partir d'un composé polyimide et ayant une différence réduite en résistivité superficielle entre sa surface interne et sa surface externe, telle qu'un revêtement antistatique, même sans l'application de traitement de surface additionnel, tel qu'un revêtement antistatique, procurant ainsi des propriétés de fonctionnement améliorées, et qui est en outre, sans couture et présente une épaisseur uniforme grâce à une minimisation de variation d'épaisseur. L'invention concerne également un procédé de fabrication de la courroie de transfert intermédiaire.
PCT/KR2007/006538 2006-12-18 2007-12-14 Courroie de transfert intermédiaire et son procédé de fabrication Ceased WO2008075857A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2009542636A JP2010513978A (ja) 2006-12-18 2007-12-14 中間転写ベルト及びその製造方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2006-0129619 2006-12-18
KR1020060129619A KR20080056564A (ko) 2006-12-18 2006-12-18 중간전사벨트 및 그 제조방법

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WO2008075857A1 true WO2008075857A1 (fr) 2008-06-26

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PCT/KR2007/006538 Ceased WO2008075857A1 (fr) 2006-12-18 2007-12-14 Courroie de transfert intermédiaire et son procédé de fabrication

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JP (1) JP2010513978A (fr)
KR (1) KR20080056564A (fr)
CN (1) CN101595434A (fr)
TW (1) TW200842526A (fr)
WO (1) WO2008075857A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000305377A (ja) * 1999-04-22 2000-11-02 Nitto Denko Corp 半導電性ベルト及びその製造方法
JP2001051535A (ja) * 1999-08-06 2001-02-23 Nitto Denko Corp 定着ベルト
JP2002283368A (ja) * 2001-03-28 2002-10-03 Kanegafuchi Chem Ind Co Ltd ポリイミドベルト
JP2003255726A (ja) * 2002-03-06 2003-09-10 Nitto Denko Corp 半導電性ベルト及びその製造方法
JP2003270967A (ja) * 2002-03-18 2003-09-25 Nitto Denko Corp 転写定着ベルト
JP2004287012A (ja) * 2003-03-20 2004-10-14 Nitto Denko Corp 半導電性ベルト

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0312261A (ja) * 1989-06-12 1991-01-21 Canon Inc 円筒状物体の塗布方法
JP3923250B2 (ja) * 2000-11-30 2007-05-30 太陽誘電株式会社 液体塗布物の塗布方法
JP4285332B2 (ja) * 2004-06-02 2009-06-24 富士ゼロックス株式会社 ポリイミド無端ベルト、及び画像形成装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000305377A (ja) * 1999-04-22 2000-11-02 Nitto Denko Corp 半導電性ベルト及びその製造方法
JP2001051535A (ja) * 1999-08-06 2001-02-23 Nitto Denko Corp 定着ベルト
JP2002283368A (ja) * 2001-03-28 2002-10-03 Kanegafuchi Chem Ind Co Ltd ポリイミドベルト
JP2003255726A (ja) * 2002-03-06 2003-09-10 Nitto Denko Corp 半導電性ベルト及びその製造方法
JP2003270967A (ja) * 2002-03-18 2003-09-25 Nitto Denko Corp 転写定着ベルト
JP2004287012A (ja) * 2003-03-20 2004-10-14 Nitto Denko Corp 半導電性ベルト

Also Published As

Publication number Publication date
KR20080056564A (ko) 2008-06-23
JP2010513978A (ja) 2010-04-30
CN101595434A (zh) 2009-12-02
TW200842526A (en) 2008-11-01

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