WO2019230316A1 - Conductive endless belt - Google Patents

Conductive endless belt Download PDF

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Publication number
WO2019230316A1
WO2019230316A1 PCT/JP2019/018433 JP2019018433W WO2019230316A1 WO 2019230316 A1 WO2019230316 A1 WO 2019230316A1 JP 2019018433 W JP2019018433 W JP 2019018433W WO 2019230316 A1 WO2019230316 A1 WO 2019230316A1
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Prior art keywords
endless belt
mass
base material
parts
material layer
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PCT/JP2019/018433
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French (fr)
Japanese (ja)
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達也 裏川
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株式会社ブリヂストン
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    • 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
    • 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

Definitions

  • the present invention relates to a conductive endless belt.
  • an intermediate transfer type image forming apparatus using an intermediate transfer member is known as an electrophotographic image forming apparatus such as a copying machine, a facsimile machine, and a laser beam printer (LBP).
  • an intermediate transfer type image forming apparatus the toner image formed on the photoreceptor is primarily transferred to the intermediate transfer member, and then the toner image on the intermediate transfer member is secondarily transferred onto the recording medium.
  • a conductive endless belt which is an endless belt, is used as the intermediate transfer member.
  • the intermediate transfer type image forming apparatus requires a cleaning step for removing the toner on the surface of the conductive endless belt before transfer to the conductive endless belt as an intermediate transfer member.
  • many cleaning methods using a cleaning blade formed of an elastic body such as urethane rubber as a cleaning member are employed. For this reason, friction is generated between the cleaning blade and the conductive endless belt as the intermediate transfer member, and the cleaning blade is worn out, so that the cleaning performance is deteriorated and the cleaning failure occurs.
  • Patent Document 1 discloses an intermediate transfer member (intermediate transfer member) composed of a plurality of layers, the surface layer of which includes a solid lubricant.
  • the solid lubricant is a resin solid content on the surface layer of the intermediate transfer belt (intermediate transfer member). It is taught that it is preferably contained in the range of 40 to 50 parts by weight with respect to 100 parts by weight (paragraph [0075] of Patent Document 1).
  • the conductive endless belt of the present invention is an endless belt-like conductive endless belt used in an image forming apparatus, A base material layer, and a surface layer disposed on the outer peripheral surface of the base material layer,
  • the surface layer includes an ultraviolet curable resin and a solid lubricant, and the content of the solid lubricant is 15 to 35 parts by mass with respect to 100 parts by mass of the ultraviolet curable resin.
  • Such a conductive endless belt of the present invention can suppress poor cleaning, and has improved adhesion between the base material layer and the surface layer.
  • the solid lubricant is at least one selected from the group consisting of polytetrafluoroethylene (PTFE) and molybdenum disulfide.
  • the ultraviolet curable resin is at least one selected from the group consisting of acrylic acrylate, urethane acrylate and acrylic monomer.
  • the surface property of the conductive endless belt is good.
  • the surface layer preferably has a thickness of 2 to 8 ⁇ m.
  • the conductive endless belt having such a configuration has good surface properties and excellent durability.
  • the present invention it is possible to provide a conductive endless belt that can suppress poor cleaning and improve the adhesion between the base material layer and the surface layer.
  • FIG. 3 is a schematic diagram illustrating an example of a configuration of a printing unit of an image forming apparatus using an intermediate transfer method using the conductive endless belt of the present invention as an intermediate transfer member.
  • the conductive endless belt of the present invention is an endless belt-shaped conductive endless belt used in an image forming apparatus, and includes a base material layer and a surface layer disposed on the outer peripheral surface of the base material layer.
  • the surface layer includes an ultraviolet curable resin and a solid lubricant, and the content of the solid lubricant is 15 to 35 parts by mass with respect to 100 parts by mass of the ultraviolet curable resin. .
  • the conductive endless belt of the present invention for an image forming apparatus, it is possible to suppress poor cleaning, and since the adhesion between the base material layer and the surface layer is improved, an excellent image can be obtained over a long period of time. It becomes possible to form stably.
  • FIG. 1 is a partial cross-sectional view in the thickness direction schematically showing an example of the conductive endless belt of the present invention.
  • a conductive endless belt 1 shown in FIG. 1 includes a base material layer 2 and a surface layer 3 disposed on the outer peripheral surface of the base material layer 2.
  • thermoplastic polyalkylene naphthalate resin examples include thermoplastic polyethylene naphthalate resin (PEN) and thermoplastic polybutylene naphthalate resin (PBN). Among these, PBN is preferable.
  • a thermoplastic polyalkylene naphthalate resin may be used individually by 1 type, and may be used in combination of 2 or more type.
  • the base material layer 2 further preferably includes a thermoplastic polybutylene naphthalate resin (PBN) and a thermoplastic polybutylene terephthalate resin (PBT).
  • PBN thermoplastic polybutylene naphthalate resin
  • PBT thermoplastic polybutylene terephthalate resin
  • the mass ratio of PBN and PBT is preferably in the range of 0.64 to 1.5.
  • the mass ratio of PBN and PBT is 0.64 to 1.5, it is possible to obtain a belt that has voltage dependency on electrical resistance and suppresses the occurrence of curling.
  • the curl refers to a phenomenon in which when the belt is fixed for a certain period of time, a mark remains on the belt due to the shape of the belt being fixed.
  • the PBN content in the base material layer is preferably 46 to 54% by mass of the resin component in the base material layer.
  • the base material layer 2 preferably further contains a thermoplastic elastomer.
  • a thermoplastic elastomer is not particularly limited, and is not limited to polyester-based thermoplastic elastomer, polyamide-based thermoplastic elastomer, polyether-based thermoplastic elastomer, polyolefin-based thermoplastic elastomer, polyurethane-based thermoplastic elastomer, styrene-based thermoplastic elastomer.
  • a thermoplastic elastomer, an acrylic thermoplastic elastomer, a polydiene thermoplastic elastomer, etc. are mentioned.
  • the base material layer 2 can appropriately contain a conductive agent in order to adjust conductivity.
  • a conductive agent include an electronic conductive agent and an ionic conductive agent.
  • (Ink) carbon pyrolytic carbon, natural graphite, artificial graphite, antimony-doped tin oxide, titanium oxide, zinc oxide, nickel, copper, silver, germanium and other conductive metals, polyaniline, polypyrrole, polyacetylene and other conductive polymers, carbon Examples include whiskers, graphite whiskers, titanium carbide whiskers, conductive potassium titanate whiskers, conductive barium titanate whiskers, conductive titanium oxide whiskers, and conductive zinc oxide whiskers.
  • the oligomer having a polymerizable unsaturated group is preferably a (meth) acrylate oligomer.
  • the (meth) acrylate oligomer specifically, acrylic (meth) acrylate, urethane (meth) acrylate, epoxy (meth) acrylate, polyester (meth) acrylate, polycarbonate (meth) acrylate, polyether (meth) acrylate, Examples include polybutadiene (meth) acrylate, silicone (meth) acrylate, and acrylic silicone (meth) acrylate.
  • (meth) acrylate” refers to acrylate and methacrylate (hereinafter the same).
  • the monomer having a polymerizable unsaturated group is preferably a (meth) acrylic monomer.
  • the (meth) acrylic monomer include (meth) acrylic acid and (meth) acrylate monomers.
  • Specific examples of the (meth) acrylate monomer include n-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, isomyristyl (meth) acrylate, and isostearyl (meth) acrylate.
  • the content of the solid lubricant is 15 to 35 parts by mass, preferably 20 to 30 parts by mass with respect to 100 parts by mass of the ultraviolet curable resin. If the solid lubricant content is less than 15 parts by mass with respect to 100 parts by mass of the UV curable resin, the friction between the conductive endless belt and the cleaning blade cannot be sufficiently reduced. In addition, the cleaning failure cannot be sufficiently suppressed. On the other hand, when it exceeds 35 parts by mass, the adhesion between the base material layer and the surface layer is lowered.
  • the surface layer 3 can appropriately contain a conductive agent in order to adjust conductivity.
  • the conductive agent include the electronic conductive agent and the ionic conductive agent exemplified in the above-mentioned section of the base material layer.
  • the conductive agent is an electronic conductive agent
  • the added amount of the conductive agent is preferably 1 to 100 parts by weight, more preferably 100 parts by weight of the ultraviolet curable resin. 1 to 80 parts by mass, and even more preferably 5 to 50 parts by mass.
  • the conductive agent is an ionic conductive agent
  • the addition amount of the ionic conductive agent is preferably 100 parts by mass of the ultraviolet curable resin. Is 0.01 to 10 parts by mass, more preferably 0.05 to 5 parts by mass.
  • the surface layer 3 can be formed, for example, by applying a raw material composition for forming a surface layer containing an ultraviolet curable resin and a solid lubricant on the base material layer 2 and curing it by ultraviolet irradiation.
  • the conditions of ultraviolet irradiation such as illuminance and integrated light quantity can be appropriately adjusted according to the type of ultraviolet curable resin used, the thickness of the surface layer, and the like.
  • the raw material composition for forming the surface layer preferably contains a photopolymerization initiator.
  • a photopolymerization initiator examples include acetophenone, 1- (4-dodecylphenyl) -2-hydroxy-2-methylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1 -Phenyl-1-propan-1-one, 1- (4-isopropylphenyl) -2-hydroxy-2-methyl-propan-1-one, 2-methyl-1- [4- (methylthio) phenyl] -2 Acetophenones such as morpholinopropanone-1, benzoin or benzoin alkyl ethers such as benzoin, benzoin methyl ether, benzoin ethyl ether and benzoin isopropyl ether, aromatic ketones such as benzophen
  • photoinitiators may be used individually by 1 type, and may be used in combination of 2 or more type.
  • the amount of the photopolymerization initiator used is preferably in the range of 0.1 to 10 parts by mass with respect to 100 parts by mass of the ultraviolet curable resin.
  • the raw material composition for forming the surface layer may contain a solvent such as methyl ethyl ketone in order to improve the coatability.
  • the conductive endless belt of the present invention is formed by, for example, (1) kneading a raw material composition for forming a base material layer with a kneader, and extruding the obtained kneaded material using an annular die to form a base material layer. And (2) It can produce by apply
  • the cutting in the width direction of the conductive endless belt may be after the formation of the base material layer by extrusion molding or after the formation of the surface layer by ultraviolet curing.
  • FIG. 2 is a schematic diagram illustrating an example of a configuration of a printing unit of an intermediate transfer type image forming apparatus.
  • the conductive endless belt of the present invention can be used as the intermediate transfer member 11.
  • a first developing unit 13a, a second developing unit 13b, and a third developing unit 13c that develop the electrostatic latent images on the photosensitive drums 12a, 12b, 12c, and 12d with yellow, magenta, cyan, and black, respectively.
  • the fourth developing unit 13d is sequentially arranged along the intermediate transfer member 11, and the intermediate transfer member 11 is driven to circulate in the direction of the arrow in the drawing to expose the photosensitive portions of the developing units 13a, 13b, 13c, and 13d.
  • reference numeral 17 denotes a drive roller (or tension roller) for circulatingly driving the intermediate transfer member 11
  • reference numeral 18 denotes a secondary transfer roller
  • reference numeral 19 denotes a recording medium feeding device.
  • Reference numeral 20 denotes a fixing device for fixing an image on a recording medium by heating or the like.
  • the intermediate transfer member 11 by using the above-described conductive endless belt of the present invention as the intermediate transfer member 11, it is possible to suppress a cleaning failure.
  • the conductive endless belt since the conductive endless belt has high adhesion between the base material layer and the surface layer, the durability of the intermediate transfer member 11 is improved, and an excellent image can be stably formed over a long period of time. Become.
  • PBN thermoplastic polybutylene naphthalate resin
  • TQB-OT thermoplastic elastomer
  • Carbodiimide Compound Neshinbo Chemical Co., Ltd., trade name “Carbodilite HMV-8CA”
  • the base of an endless belt having an inner diameter of 250 mm, a thickness of 80 ⁇ m, and a width of 250 mm is formed by extrusion using a molding machine equipped with a cylindrical die at the end of a single screw extruder.
  • a material layer was prepared.
  • the surface layer forming composition contains 5 parts by mass of a photopolymerization initiator (IGM Resins, trade name “Omnirad 184”), light 0.5 parts by mass of a polymerization initiator (IGM Resins, trade name “Omnirad 819”), 2 parts by weight of a fluorine additive (trade name “Modiper F606”, manufactured by NOF Corporation), a fluorine additive (DIC) 3 parts by mass of trade name “Megafac RS-72-K”) and 15 parts by mass of conductive metal oxide (manufactured by Resinocolor Kogyo Co., Ltd.) were added.
  • a photopolymerization initiator IGM Resins, trade name “Omnirad 184”
  • light 0.5 parts by mass of a polymerization initiator
  • IGM Resins trade name “Omnirad 819”
  • 2 parts by weight of a fluorine additive trade name “Modiper F606”, manufactured by NOF Corporation
  • the coating film was dried at 50 ° C. for 2 minutes.
  • illuminance 100 ⁇ 700mW / cm 2 accumulated light quantity 200 ⁇ 3000mJ / cm 2
  • a nitrogen purge irradiated with ultraviolet light under conditions of a nitrogen purge, to cure the coating A surface layer was formed.
  • the surface layer was polished with a wrapping film of # 2000 to # 6000 to obtain a conductive endless belt.
  • Friction coefficient change The friction coefficient of the surface is measured by using a device having a balance arm represented by a surface property tester Type 38 (manufactured by Shinto Kagaku).
  • the terminal is brought into contact with the belt using a sphere made of thermosetting urethane or SUS ball wrapped with a resin film, and the coefficient of dynamic friction between the terminal and the belt is measured.
  • the terminal scanning speed is 60 mm / min, and the load is 50 g.
  • the acrylic resin particles and the belt are rubbed, and the difference in coefficient of friction between the rubbed portion and the non-rubbed portion is used as an evaluation criterion. A smaller friction coefficient difference indicates that cleaning failure can be suppressed.
  • the resin particles were rubbed using a friction and wear tester represented by FPR2100 (manufactured by Reska), and resin fine particles (resin particles are Negami Kogyo Acrylic Particles J-3PY, Soken Chemicals Acrylic Particles MX-80H3wT, etc.) This was carried out by applying a general acrylic fine particle) to the surface of the belt and then moving it circularly for 20 min at a linear velocity of 150 mm / s, a radius of 15 mm, and a load of 50 g.
  • the evaluation criteria are shown below.
  • ⁇ Difference in friction coefficient between rubbed portion and non-rubbed portion is 0.1 or less
  • ⁇ Difference in friction coefficient between rubbed portion and non-rubbed portion is more than 0.1 and less than 0.2
  • ⁇ With rubbed portion Difference in coefficient of friction of non-rubbed part is 0.2 or more
  • the conductive endless belts of the examples according to the present invention can suppress poor cleaning and have good adhesion between the base material layer and the surface layer.
  • 1 conductive endless belt
  • 2 base material layer
  • 3 surface layer
  • 11 intermediate transfer member
  • 12a, 12b, 12c, 12d photosensitive drum
  • 13a, 13b, 13c, 13d developing unit
  • 14 recording medium

Abstract

The present invention addresses the problem of providing a conductive endless belt which has improved adhesion between a base material layer and a surface layer, while being able to be suppressed in cleaning failure. A means for solving the problem is a conductive endless belt (1) which is in the form of an edgeless belt to be used in an image forming apparatus, and which is characterized by being provided with a base material layer (2) and a surface layer (3) that is arranged on the outer circumferential surface of the base material layer (2). The conductive endless belt (1) is also characterized in that: the surface layer (3) contains an ultraviolet cured resin and a solid lubricant; and the content of the solid lubricant is 15-35 parts by mass relative to 100 parts by mass of the ultraviolet cured resin.

Description

導電性エンドレスベルトConductive endless belt
　本発明は、導電性エンドレスベルトに関するものである。 The present invention relates to a conductive endless belt.
　従来、複写機、ファクシミリ、レーザービームプリンタ（ＬＢＰ）等の電子写真方式の画像形成装置として、中間転写部材を用いる中間転写方式の画像形成装置が知られている。かかる中間転写方式の画像形成装置では、感光体上に形成されたトナー像が中間転写部材に一次転写され、その後、中間転写部材上のトナー像が記録媒体上に二次転写される。ここで、該中間転写部材としては、無端状のベルトである導電性エンドレスベルトが用いられている。 2. Description of the Related Art Conventionally, an intermediate transfer type image forming apparatus using an intermediate transfer member is known as an electrophotographic image forming apparatus such as a copying machine, a facsimile machine, and a laser beam printer (LBP). In such an intermediate transfer type image forming apparatus, the toner image formed on the photoreceptor is primarily transferred to the intermediate transfer member, and then the toner image on the intermediate transfer member is secondarily transferred onto the recording medium. Here, a conductive endless belt, which is an endless belt, is used as the intermediate transfer member.
　前記中間転写方式の画像成形装置においては、中間転写部材としての導電性エンドレスベルトに転写する前に、導電性エンドレスベルトの表面のトナーを除去するクリーニング工程が必要となる。該クリーニング工程では、クリーニング部材としてウレタンゴム等の弾性体で形成されたクリーニングブレードを用いるクリーニング方式が多く採用されている。そのため、クリーニングブレードと、中間転写部材としての導電性エンドレスベルトとの間で摩擦が生じ、また、クリーニングブレードが摩耗することで、クリーニング性能が低下して、クリーニング不良が発生してしまう。 The intermediate transfer type image forming apparatus requires a cleaning step for removing the toner on the surface of the conductive endless belt before transfer to the conductive endless belt as an intermediate transfer member. In the cleaning process, many cleaning methods using a cleaning blade formed of an elastic body such as urethane rubber as a cleaning member are employed. For this reason, friction is generated between the cleaning blade and the conductive endless belt as the intermediate transfer member, and the cleaning blade is worn out, so that the cleaning performance is deteriorated and the cleaning failure occurs.
　かかる問題を解決する技術として、下記特許文献１には、複数層からなり、該複数層のうち表層が固体潤滑剤を含有する中間転写体（中間転写部材）が開示されている。また、該特許文献１は、所望の効果を良好に得ると共に、塗布液の良好な分散安定性を得るためには、固体潤滑剤は、中間転写ベルト（中間転写部材）の表層の樹脂固形分１００重量部に対して４０～５０重量部の範囲で含有されることが好ましいことを教示している（特許文献１の段落［００７５］）。 As a technique for solving such a problem, Patent Document 1 below discloses an intermediate transfer member (intermediate transfer member) composed of a plurality of layers, the surface layer of which includes a solid lubricant. Further, in Patent Document 1, in order to obtain a desired effect satisfactorily and to obtain good dispersion stability of the coating liquid, the solid lubricant is a resin solid content on the surface layer of the intermediate transfer belt (intermediate transfer member). It is taught that it is preferably contained in the range of 40 to 50 parts by weight with respect to 100 parts by weight (paragraph [0075] of Patent Document 1).
特開２０１７－１８２０８１号公報JP 2017-182081 A
　しかしながら、本発明者が検討したところ、上記特許文献１に記載の中間転写体（中間転写部材）は、表層とその下層（基材層）との間の接着性が不十分であることが分かった。 However, as a result of investigation by the present inventor, it has been found that the intermediate transfer member (intermediate transfer member) described in Patent Document 1 has insufficient adhesion between the surface layer and the lower layer (base material layer). It was.
　そこで、本発明は、上記従来技術の問題を解決し、クリーニング不良を抑制できる上、基材層と表層との間の接着性を向上させた導電性エンドレスベルトを提供することを課題とする。 Therefore, an object of the present invention is to provide a conductive endless belt that solves the above-described problems of the prior art, can suppress poor cleaning, and has improved adhesion between the base material layer and the surface layer.
　上記課題を解決する本発明の要旨構成は、以下の通りである。 The gist configuration of the present invention for solving the above-described problems is as follows.
　本発明の導電性エンドレスベルトは、画像形成装置に用いられる無端ベルト状の導電性エンドレスベルトであって、
　基材層と、該基材層の外周面上に配設された表層と、を具え、
　前記表層が、紫外線硬化樹脂と、固体潤滑剤と、を含み、該固体潤滑剤の含有量が、前記紫外線硬化樹脂１００質量部に対して、１５～３５質量部であることを特徴とする。
　かかる本発明の導電性エンドレスベルトは、クリーニング不良を抑制でき、また、基材層と表層との間の接着性が向上している。 The conductive endless belt of the present invention is an endless belt-like conductive endless belt used in an image forming apparatus,
A base material layer, and a surface layer disposed on the outer peripheral surface of the base material layer,
The surface layer includes an ultraviolet curable resin and a solid lubricant, and the content of the solid lubricant is 15 to 35 parts by mass with respect to 100 parts by mass of the ultraviolet curable resin.
Such a conductive endless belt of the present invention can suppress poor cleaning, and has improved adhesion between the base material layer and the surface layer.
　本発明の導電性エンドレスベルトの好適例においては、前記固体潤滑剤が、ポリテトラフルオロエチレン（ＰＴＦＥ）及び二硫化モリブデンからなる群から選択される少なくとも一種である。かかる構成の導電性エンドレスベルトを画像形成装置に用いることで、クリーニング不良を更に抑制できる。 In a preferred example of the conductive endless belt of the present invention, the solid lubricant is at least one selected from the group consisting of polytetrafluoroethylene (PTFE) and molybdenum disulfide. By using the conductive endless belt having such a configuration in the image forming apparatus, it is possible to further suppress the cleaning failure.
　本発明の導電性エンドレスベルトの他の好適例においては、前記紫外線硬化樹脂が、アクリルアクリレート、ウレタンアクリレート及びアクリルモノマーからなる群から選択される少なくとも一種である。この場合、導電性エンドレスベルトの表面性が良好である。 In another preferred embodiment of the conductive endless belt of the present invention, the ultraviolet curable resin is at least one selected from the group consisting of acrylic acrylate, urethane acrylate and acrylic monomer. In this case, the surface property of the conductive endless belt is good.
　本発明の導電性エンドレスベルトにおいて、前記表層は、厚さが２～８μｍであることが好ましい。かかる構成の導電性エンドレスベルトは、表面性が良好であり、また、耐久性にも優れる。 In the conductive endless belt of the present invention, the surface layer preferably has a thickness of 2 to 8 μm. The conductive endless belt having such a configuration has good surface properties and excellent durability.
　本発明によれば、クリーニング不良を抑制できる上、基材層と表層との間の接着性を向上させた導電性エンドレスベルトを提供することができる。 According to the present invention, it is possible to provide a conductive endless belt that can suppress poor cleaning and improve the adhesion between the base material layer and the surface layer.
本発明の導電性エンドレスベルトの一例を模式的に示した、厚さ方向の部分断面図である。It is the fragmentary sectional view of the thickness direction which showed an example of the conductive endless belt of the present invention typically. 本発明の導電性エンドレスベルトを中間転写部材として用いた、中間転写方式による画像形成装置の印字部構成の一例を示す概略図である。FIG. 3 is a schematic diagram illustrating an example of a configuration of a printing unit of an image forming apparatus using an intermediate transfer method using the conductive endless belt of the present invention as an intermediate transfer member.
＜導電性エンドレスベルト＞
　以下に、本発明の導電性エンドレスベルトを、その実施形態に基づき、詳細に例示説明する。 <Conductive endless belt>
Below, the electroconductive endless belt of this invention is illustrated and demonstrated in detail based on the embodiment.
　本発明の導電性エンドレスベルトは、画像形成装置に用いられる無端ベルト状の導電性エンドレスベルトであって、基材層と、該基材層の外周面上に配設された表層と、を具え、該表層が、紫外線硬化樹脂と、固体潤滑剤と、を含み、該固体潤滑剤の含有量が、前記紫外線硬化樹脂１００質量部に対して、１５～３５質量部であることを特徴とする。 The conductive endless belt of the present invention is an endless belt-shaped conductive endless belt used in an image forming apparatus, and includes a base material layer and a surface layer disposed on the outer peripheral surface of the base material layer. The surface layer includes an ultraviolet curable resin and a solid lubricant, and the content of the solid lubricant is 15 to 35 parts by mass with respect to 100 parts by mass of the ultraviolet curable resin. .
　本発明の導電性エンドレスベルトにおいては、表層中の固体潤滑剤の含有量が、紫外線硬化樹脂１００質量部に対して１５質量部以上であることで、中間転写部材としての導電性エンドレスベルトと、クリーニングブレードとの間の摩擦を十分に低減でき、該摩擦が低減されることでクリーニングブレードの摩耗が低減され、クリーニング不良を抑制できる。
　また、本発明の導電性エンドレスベルトにおいては、表層中の固体潤滑剤の含有量が、紫外線硬化樹脂１００質量部に対して３５質量部以下であることで、基材層と表層との間の接着性が向上する。
　従って、本発明の導電性エンドレスベルトを画像形成装置に用いることで、クリーニング不良を抑制でき、また、基材層と表層との接着性が向上しているため、長期に渡って優れた画像を安定的に形成することが可能となる。 In the conductive endless belt of the present invention, the content of the solid lubricant in the surface layer is 15 parts by mass or more with respect to 100 parts by mass of the ultraviolet curable resin, so that the conductive endless belt as an intermediate transfer member; Friction with the cleaning blade can be sufficiently reduced, and the friction is reduced, so that wear of the cleaning blade is reduced and defective cleaning can be suppressed.
Moreover, in the electroconductive endless belt of this invention, content of the solid lubricant in a surface layer is 35 mass parts or less with respect to 100 mass parts of ultraviolet curable resin, Between a base material layer and a surface layer Adhesion is improved.
Therefore, by using the conductive endless belt of the present invention for an image forming apparatus, it is possible to suppress poor cleaning, and since the adhesion between the base material layer and the surface layer is improved, an excellent image can be obtained over a long period of time. It becomes possible to form stably.
　本発明の導電性エンドレスベルト（以下、単に「ベルト」と称することがある）は、画像形成装置に用いられる無端ベルト状の導電性エンドレスベルトである。ここで、無端ベルト状とは、ベルトの駆動方向（周方向）にベルトが連続していることを意味する。なお、画像形成装置については、後述する。 The conductive endless belt of the present invention (hereinafter sometimes simply referred to as “belt”) is an endless belt-like conductive endless belt used in an image forming apparatus. Here, the endless belt shape means that the belt is continuous in the driving direction (circumferential direction) of the belt. The image forming apparatus will be described later.
　次に、図１を参照しながら、本発明の導電性エンドレスベルトの一実施形態を説明する。図１は、本発明の導電性エンドレスベルトの一例を模式的に示した、厚さ方向の部分断面図である。図１に示す導電性エンドレスベルト１は、基材層２と、該基材層２の外周面上に配設された表層３と、を具える。 Next, an embodiment of the conductive endless belt of the present invention will be described with reference to FIG. FIG. 1 is a partial cross-sectional view in the thickness direction schematically showing an example of the conductive endless belt of the present invention. A conductive endless belt 1 shown in FIG. 1 includes a base material layer 2 and a surface layer 3 disposed on the outer peripheral surface of the base material layer 2.
　本発明の導電性エンドレスベルト１の基材層２は、種々の材料から形成することができ、特に限定されるものではないが、熱可塑性ポリアルキレンナフタレート樹脂を含有することが好ましく、熱可塑性ポリアルキレンナフタレート樹脂と、熱可塑性ポリブチレンテレフタレート樹脂（ＰＢＴ）と、を含有することが更に好ましい。ここで、基材層中のＰＢＴの含有量は、基材層中の樹脂成分の３６質量％以上であることが好ましい。ＰＢＴの含有量が３６質量％以上であると、電気抵抗に電圧依存性を有するベルトとすることができる。また、基材層中のＰＢＴの含有量は、基材層中の樹脂成分の６０質量％以下であることが好ましく、４４質量％以下であることが更に好ましい。 The base material layer 2 of the conductive endless belt 1 of the present invention can be formed from various materials, and is not particularly limited, but preferably contains a thermoplastic polyalkylene naphthalate resin, and is thermoplastic. More preferably, it contains a polyalkylene naphthalate resin and a thermoplastic polybutylene terephthalate resin (PBT). Here, it is preferable that content of PBT in a base material layer is 36 mass% or more of the resin component in a base material layer. When the content of PBT is 36% by mass or more, a belt having voltage dependency on electric resistance can be obtained. Further, the content of PBT in the base material layer is preferably 60% by mass or less, and more preferably 44% by mass or less of the resin component in the base material layer.
　前記熱可塑性ポリアルキレンナフタレート樹脂としては、熱可塑性ポリエチレンナフタレート樹脂（ＰＥＮ）、熱可塑性ポリブチレンナフタレート樹脂（ＰＢＮ）等が挙げられる。これらの中でも、ＰＢＮが好ましい。なお、熱可塑性ポリアルキレンナフタレート樹脂は、１種単独で用いてもよいし、２種以上を組み合わせて用いてもよい。 Examples of the thermoplastic polyalkylene naphthalate resin include thermoplastic polyethylene naphthalate resin (PEN) and thermoplastic polybutylene naphthalate resin (PBN). Among these, PBN is preferable. In addition, a thermoplastic polyalkylene naphthalate resin may be used individually by 1 type, and may be used in combination of 2 or more type.
　前記基材層２は、熱可塑性ポリブチレンナフタレート樹脂（ＰＢＮ）と熱可塑性ポリブチレンテレフタレート樹脂（ＰＢＴ）とを含むことが更に好ましく、ここで、ＰＢＮとＰＢＴの質量比率（ＰＢＮの質量／ＰＢＴの質量）は０．６４～１．５の範囲が好ましい。ＰＢＮとＰＢＴの質量比率が０．６４～１．５の場合、電気抵抗に電圧依存性を有すると共に、巻き癖の発生を抑制したベルトとすることができる。ここで、巻き癖とは、ベルトを一定時間固定した際に、ベルトを固定していた形状によって、ベルトに痕が残ってしまう現象をいう。前記質量比率にするためには、基材層中のＰＢＮの含有量は、基材層中の樹脂成分の４６～５４質量％であることが好ましい。 The base material layer 2 further preferably includes a thermoplastic polybutylene naphthalate resin (PBN) and a thermoplastic polybutylene terephthalate resin (PBT). Here, the mass ratio of PBN and PBT (mass of PBN / PBT). Is preferably in the range of 0.64 to 1.5. When the mass ratio of PBN and PBT is 0.64 to 1.5, it is possible to obtain a belt that has voltage dependency on electrical resistance and suppresses the occurrence of curling. Here, the curl refers to a phenomenon in which when the belt is fixed for a certain period of time, a mark remains on the belt due to the shape of the belt being fixed. In order to obtain the mass ratio, the PBN content in the base material layer is preferably 46 to 54% by mass of the resin component in the base material layer.
　前記基材層２は、更に、熱可塑性エラストマーを含有することが好ましい。基材層が熱可塑性エラストマーを含有することで、ベルトの耐折れ性等の耐久性を向上させることができる。ここで、熱可塑性エラストマーとしては、特に制限されるものではなく、ポリエステル系熱可塑性エラストマー、ポリアミド系熱可塑性エラストマー、ポリエーテル系熱可塑性エラストマー、ポリオレフィン系熱可塑性エラストマー、ポリウレタン系熱可塑性エラストマー、スチレン系熱可塑性エラストマー、アクリル系熱可塑性エラストマー、ポリジエン系熱可塑性エラストマー等が挙げられる。これらの中でも、ポリエステル系熱可塑性エラストマーが好ましく、特には、ポリブチレンナフタレートエラストマーが好ましい。ポリエステル系熱可塑性エラストマー、特には、ポリブチレンナフタレートエラストマーを用いることで、ベルトが柔らかくなり、ベルトの耐久性が更に向上する。なお、熱可塑性エラストマーの含有量は、基材層中の樹脂成分の４０質量％以下であることが好ましく、５～３０質量％の範囲が更に好ましい。 The base material layer 2 preferably further contains a thermoplastic elastomer. When the base material layer contains the thermoplastic elastomer, durability such as folding resistance of the belt can be improved. Here, the thermoplastic elastomer is not particularly limited, and is not limited to polyester-based thermoplastic elastomer, polyamide-based thermoplastic elastomer, polyether-based thermoplastic elastomer, polyolefin-based thermoplastic elastomer, polyurethane-based thermoplastic elastomer, styrene-based thermoplastic elastomer. A thermoplastic elastomer, an acrylic thermoplastic elastomer, a polydiene thermoplastic elastomer, etc. are mentioned. Among these, a polyester-based thermoplastic elastomer is preferable, and a polybutylene naphthalate elastomer is particularly preferable. By using a polyester-based thermoplastic elastomer, particularly a polybutylene naphthalate elastomer, the belt becomes soft and the durability of the belt is further improved. The content of the thermoplastic elastomer is preferably 40% by mass or less of the resin component in the base material layer, and more preferably in the range of 5 to 30% by mass.
　前記基材層２は、更に、カルボジイミド化合物を含むことが好ましい。熱可塑性ポリアルキレンナフタレート樹脂や、熱可塑性ポリブチレンテレフタレート樹脂（ＰＢＴ）等のポリエステル系材料は、成形加熱時において加水分解による分子量の低下を引き起こし易いが、これらポリエステル系材料の加水分解によって生じたカルボキシル基と、カルボジイミド化合物のカルボジイミド基とが反応して再架橋することで、分子量の低下を抑制できる。これにより、ベルトの脆化を防止することができ、耐久時におけるベルトの耐割れ性を向上させることができる。該カルボジイミド化合物としては、市販品を利用することができ、例えば、日清紡ケミカル社製の商品名「カルボジライト」等が挙げられる。また、該カルボジイミド化合物は、予めマスターバッチ化されたペレット等の形態でも用いることができ、例えば、日清紡ケミカル社製の商品名「カルボジライトＥペレット」、「カルボジライトＢペレット」等が挙げられる。前記カルボジイミド化合物の添加量は、特に限定されるものではないが、基材層中の樹脂成分１００質量部に対して、０．０５～３０質量部の範囲が好ましく、０．１～５質量部の範囲が更に好ましい。 The base material layer 2 preferably further contains a carbodiimide compound. Polyester materials such as thermoplastic polyalkylene naphthalate resin and thermoplastic polybutylene terephthalate resin (PBT) are likely to cause a decrease in molecular weight due to hydrolysis during molding heating, but are caused by hydrolysis of these polyester materials. Reduction in molecular weight can be suppressed by reacting the carboxyl group and the carbodiimide group of the carbodiimide compound to cause re-crosslinking. Thereby, embrittlement of the belt can be prevented, and the crack resistance of the belt during durability can be improved. Commercially available products can be used as the carbodiimide compound, and examples thereof include trade name “Carbodilite” manufactured by Nisshinbo Chemical Co., Ltd. The carbodiimide compound can also be used in the form of pellets or the like previously masterbatched, and examples thereof include trade names “Carbodilite E pellets” and “Carbodilite B pellets” manufactured by Nisshinbo Chemical Co., Ltd. The amount of the carbodiimide compound added is not particularly limited, but is preferably in the range of 0.05 to 30 parts by mass, and 0.1 to 5 parts by mass with respect to 100 parts by mass of the resin component in the base material layer. The range of is more preferable.
　前記基材層２には、導電性を調整するために、導電剤を適宜含有させることができる。ここで、導電剤としては、電子導電剤、イオン導電剤等が挙げられる。 The base material layer 2 can appropriately contain a conductive agent in order to adjust conductivity. Here, examples of the conductive agent include an electronic conductive agent and an ionic conductive agent.
　前記電子導電剤としては、例えば、ケッチェンブラック、アセチレンブラック等の導電性カーボン、ＳＡＦ、ＩＳＡＦ、ＨＡＦ、ＦＥＦ、ＧＰＦ、ＳＲＦ、ＦＴ、ＭＴ等のゴム用カーボンブラック、酸化処理等を施したカラー（インク）用カーボン、熱分解カーボン、天然グラファイト、人造グラファイト、アンチモンドープ酸化錫、酸化チタン、酸化亜鉛、ニッケル、銅、銀、ゲルマニウム等の金属、ポリアニリン、ポリピロール、ポリアセチレン等の導電性ポリマー、カーボンウィスカー、黒鉛ウィスカー、炭化チタンウィスカー、導電性チタン酸カリウムウィスカー、導電性チタン酸バリウムウィスカー、導電性酸化チタンウィスカー、導電性酸化亜鉛ウィスカー等の導電性ウィスカー等が挙げられる。 Examples of the electronic conductive agent include conductive carbon such as ketjen black and acetylene black, carbon black for rubber such as SAF, ISAF, HAF, FEF, GPF, SRF, FT, and MT, and a color subjected to oxidation treatment. (Ink) carbon, pyrolytic carbon, natural graphite, artificial graphite, antimony-doped tin oxide, titanium oxide, zinc oxide, nickel, copper, silver, germanium and other conductive metals, polyaniline, polypyrrole, polyacetylene and other conductive polymers, carbon Examples include whiskers, graphite whiskers, titanium carbide whiskers, conductive potassium titanate whiskers, conductive barium titanate whiskers, conductive titanium oxide whiskers, and conductive zinc oxide whiskers.
　前記イオン導電剤としては、例えば、テトラエチルアンモニウム、テトラブチルアンモニウム、ドデシルトリメチルアンモニウム、ヘキサデシルトリメチルアンモニウム、オクタデシルトリメチルアンモニウム、ベンジルトリメチルアンモニウム、変性脂肪酸ジメチルエチルアンモニウム等の四級アンモニウムの過塩素酸塩、塩素酸塩、塩酸塩、臭素酸塩、ヨウ素酸塩、ホウフッ化水素酸塩、硫酸塩、アルキル硫酸塩、カルボン酸塩、スルホン酸塩等、リチウム、ナトリウム、カリウム等のアルカリ金属の過塩素酸塩、塩素酸塩、塩酸塩、臭素酸塩、ヨウ素酸塩、ホウフッ化水素酸塩、トリフルオロメチル硫酸塩、スルホン酸塩等、カルシウム、マグネシウム等のアルカリ土類金属の過塩素酸塩、塩素酸塩、塩酸塩、臭素酸塩、ヨウ素酸塩、ホウフッ化水素酸塩、トリフルオロメチル硫酸塩、スルホン酸塩等が挙げられる。 Examples of the ionic conductive agent include tetraethylammonium, tetrabutylammonium, dodecyltrimethylammonium, hexadecyltrimethylammonium, octadecyltrimethylammonium, benzyltrimethylammonium, modified fatty acid dimethylethylammonium perchlorate, chlorine, and the like. Acid, hydrochloride, bromate, iodate, borofluoride, sulfate, alkyl sulfate, carboxylate, sulfonate, etc., perchlorates of alkali metals such as lithium, sodium, potassium , Chlorate, hydrochloride, bromate, iodate, borofluoride, trifluoromethyl sulfate, sulfonate, etc., perchlorates of alkaline earth metals such as calcium, magnesium, chloric acid Salt, hydrochloride, bromate, iodate Fluoroboric acid salts, trifluoromethyl sulfate, sulfonate, and the like.
　前記導電剤は、１種単独で用いてもよいし、２種以上を組み合わせて用いてもよい。また、電子導電剤とイオン導電剤とを組み合わせて用いてもよい。 The conductive agent may be used alone or in combination of two or more. Moreover, you may use combining an electronic conductive agent and an ionic conductive agent.
　前記導電剤の添加量は、目的とするエンドレスベルトの導電性に応じて、適宜調整できるが、例えば、導電剤が電子導電剤の場合、該電子導電剤の添加量は、樹脂成分１００質量部に対して、好ましくは１～１００質量部、より好ましくは１～８０質量部、より一層好ましくは５～５０質量部であり、また、導電剤がイオン導電剤の場合、該イオン導電剤の添加量は、樹脂成分１００質量部に対して、好ましくは０．０１～１０質量部、より好ましくは０．０５～５質量部である。また、特には、導電剤としてカーボンブラックを用いる場合は、該カーボンブラックを、前記樹脂成分１００質量部に対し、５～３０質量部添加することが好ましい。 The addition amount of the conductive agent can be appropriately adjusted according to the conductivity of the target endless belt. For example, when the conductive agent is an electronic conductive agent, the added amount of the electronic conductive agent is 100 parts by mass of the resin component. Is preferably 1 to 100 parts by weight, more preferably 1 to 80 parts by weight, and even more preferably 5 to 50 parts by weight. When the conductive agent is an ionic conductive agent, the addition of the ionic conductive agent The amount is preferably 0.01 to 10 parts by mass, more preferably 0.05 to 5 parts by mass with respect to 100 parts by mass of the resin component. In particular, when carbon black is used as the conductive agent, it is preferable to add 5 to 30 parts by mass of the carbon black with respect to 100 parts by mass of the resin component.
　前記基材層２には、上述したカルボジイミド化合物及び導電剤以外の添加剤を含有させることができる。かかる添加剤としては、例えば、各種充填材、補強材、難燃剤、カップリング剤、酸化防止剤、相溶化剤、滑剤、表面処理剤、顔料、紫外線吸収剤、帯電防止剤、分散剤、中和剤、発泡剤、架橋剤、着色剤等が挙げられる。これら添加剤の含有量は、それぞれ、基材層中の樹脂成分１００質量部に対して、０．０１～１０質量部の範囲が好ましい。 The base material layer 2 can contain additives other than the carbodiimide compound and the conductive agent described above. Examples of such additives include various fillers, reinforcing materials, flame retardants, coupling agents, antioxidants, compatibilizers, lubricants, surface treatment agents, pigments, ultraviolet absorbers, antistatic agents, dispersants, and the like. Examples of the additives include foaming agents, foaming agents, crosslinking agents, and coloring agents. The content of these additives is preferably in the range of 0.01 to 10 parts by mass with respect to 100 parts by mass of the resin component in the base material layer.
　前記基材層２の厚さは、適用される部材等の形態に応じて適宜選択することができるが、好ましくは５０～２００μｍの範囲である。また、図１に示す導電性エンドレスベルト１の基材層２は１層からなるが、本発明の導電性エンドレスベルト基材層は、２層以上から構成されていてもよい。 The thickness of the base material layer 2 can be appropriately selected according to the form of the member to be applied, but is preferably in the range of 50 to 200 μm. Moreover, although the base material layer 2 of the electroconductive endless belt 1 shown in FIG. 1 consists of one layer, the electroconductive endless belt base material layer of this invention may be comprised from two or more layers.
　本発明の導電性エンドレスベルト１の表層３は、紫外線硬化樹脂を含む。該紫外線硬化樹脂は、紫外線を照射することにより硬化する樹脂であり、例えば、分子中に重合性不飽和基を有するオリゴマーや、モノマー等が挙げられる。 The surface layer 3 of the conductive endless belt 1 of the present invention contains an ultraviolet curable resin. The ultraviolet curable resin is a resin that is cured by irradiating ultraviolet rays, and examples thereof include oligomers and monomers having a polymerizable unsaturated group in the molecule.
　前記重合性不飽和基を有するオリゴマーとしては、（メタ）アクリレートオリゴマーが好ましい。該（メタ）アクリレートオリゴマーとして、具体的には、アクリル（メタ）アクリレート、ウレタン（メタ）アクリレート、エポキシ（メタ）アクリレート、ポリエステル（メタ）アクリレート、ポリカーボネート（メタ）アクリレート、ポリエーテル（メタ）アクリレート、ポリブタジエン（メタ）アクリレート、シリコーン（メタ）アクリレート、アクリルシリコーン（メタ）アクリレート等が挙げられる。ここで、「（メタ）アクリレート」とは、アクリレート及びメタクリレートを指す（以下、同じ）。 The oligomer having a polymerizable unsaturated group is preferably a (meth) acrylate oligomer. As the (meth) acrylate oligomer, specifically, acrylic (meth) acrylate, urethane (meth) acrylate, epoxy (meth) acrylate, polyester (meth) acrylate, polycarbonate (meth) acrylate, polyether (meth) acrylate, Examples include polybutadiene (meth) acrylate, silicone (meth) acrylate, and acrylic silicone (meth) acrylate. Here, “(meth) acrylate” refers to acrylate and methacrylate (hereinafter the same).
　前記重合性不飽和基を有するモノマーとしては、（メタ）アクリルモノマーが好ましい。該（メタ）アクリルモノマーとしては、（メタ）アクリル酸、（メタ）アクリレートモノマー等が挙げられる。また、該（メタ）アクリレートモノマーとして、具体的には、ｎ－ブチル（メタ）アクリレート、２－エチルヘキシル（メタ）アクリレート、ラウリル（メタ）アクリレート、イソミリスチル（メタ）アクリレート、イソステアリル（メタ）アクリレート、ｎ－オクタデシル（メタ）アクリレート、２－ヒドロキシエチル（メタ）アクリレート、２－ヒドロキシプロピル（メタ）アクリレート、３－ヒドロキシプロピル（メタ）アクリレート、４－ヒドロキシブチル（メタ）アクリレート、イソボルニル（メタ）アクリレート、ジシクロペンテニル（メタ）アクリレート、ジシクロペンテニルオキシエチル（メタ）アクリレート、エチレングリコールジ（メタ）アクリレート、プロピレングリコールジ（メタ）アクリレート、１，４－ブタンジオールジ（メタ）アクリレート、１，６－ヘキサンジオールジ（メタ）アクリレート、ネオペンチルグリコールジ（メタ）アクリレート、ジシクロペンタニルジ（メタ）アクリレート、アリル化シクロヘキシルジ（メタ）アクリレート、イソシアヌレートジ（メタ）アクリレート、トリメチロールプロパントリ（メタ）アクリレート、ジペンタエリスリトールトリ（メタ）アクリレート、ペンタエリスリトールトリ（メタ）アクリレート、ジペンタエリスリトールヘキサ（メタ）アクリレート等が挙げられる。ここで、「（メタ）アクリルモノマー」とは、アクリルモノマー及びメタクリルモノマーを指し（以下、同じ）、また、「（メタ）アクリル酸」とは、アクリル酸及びメタクリル酸を指す（以下、同じ）。 The monomer having a polymerizable unsaturated group is preferably a (meth) acrylic monomer. Examples of the (meth) acrylic monomer include (meth) acrylic acid and (meth) acrylate monomers. Specific examples of the (meth) acrylate monomer include n-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, isomyristyl (meth) acrylate, and isostearyl (meth) acrylate. , N-octadecyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, isobornyl (meth) acrylate , Dicyclopentenyl (meth) acrylate, dicyclopentenyloxyethyl (meth) acrylate, ethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, 1,4-butane All di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, dicyclopentanyl di (meth) acrylate, allylated cyclohexyl di (meth) acrylate, isocyanurate di ( Examples include (meth) acrylate, trimethylolpropane tri (meth) acrylate, dipentaerythritol tri (meth) acrylate, pentaerythritol tri (meth) acrylate, and dipentaerythritol hexa (meth) acrylate. Here, “(meth) acrylic monomer” refers to acrylic monomer and methacrylic monomer (hereinafter the same), and “(meth) acrylic acid” refers to acrylic acid and methacrylic acid (hereinafter the same). .
　前記紫外線硬化樹脂としては、アクリルアクリレート、ウレタンアクリレート及びアクリルモノマーが好ましい。表層が、アクリルアクリレート、ウレタンアクリレート及びアクリルモノマーの少なくとも一種を含む場合、表層形成後、更に研磨した後の表面の欠陥が少なくなり、導電性エンドレスベルトの表面性が良好となる。これら紫外線硬化樹脂は、１種単独で用いてもよいし、２種以上を組み合わせて用いてもよい。 As the ultraviolet curable resin, acrylic acrylate, urethane acrylate and acrylic monomer are preferable. When the surface layer contains at least one of acrylic acrylate, urethane acrylate, and acrylic monomer, surface defects after the surface layer formation and further polishing are reduced, and the surface property of the conductive endless belt is improved. These ultraviolet curable resins may be used alone or in combination of two or more.
　本発明の導電性エンドレスベルト１の表層３は、固体潤滑剤を含む。該固体潤滑剤は、室温（２３℃）において固体であって、潤滑作用を有する化合物である。かかる固体潤滑剤としては、ポリテトラフルオロエチレン（ＰＴＦＥ）、三フッ化塩化エチレン、四フッ化エチレン六フッ化プロピレン、フッ化ビニル、フッ化ビニリデン、二フッ化二塩化エチレン、フッ化黒鉛、シリコーン樹脂、シリカ、二硫化モリブデン等が挙げられる。これらの中でも、導電性エンドレスベルトとクリーニングブレードとの間の摩擦を更に低減して、クリーニング不良を更に抑制する観点から、ポリテトラフルオロエチレン（ＰＴＦＥ）及び二硫化モリブデンが好ましい。 The surface layer 3 of the conductive endless belt 1 of the present invention contains a solid lubricant. The solid lubricant is a compound that is solid at room temperature (23 ° C.) and has a lubricating action. Such solid lubricants include polytetrafluoroethylene (PTFE), ethylene trifluoride chloride, tetrafluoroethylene hexapropylene fluoride, vinyl fluoride, vinylidene fluoride, ethylene difluoride dichloride, fluorinated graphite, silicone Resins, silica, molybdenum disulfide and the like can be mentioned. Among these, polytetrafluoroethylene (PTFE) and molybdenum disulfide are preferable from the viewpoint of further reducing friction between the conductive endless belt and the cleaning blade and further suppressing poor cleaning.
　前記固体潤滑剤の含有量は、前記紫外線硬化樹脂１００質量部に対して、１５～３５質量部であり、２０～３０質量部の範囲が好ましい。固体潤滑剤の含有量が、前記紫外線硬化樹脂１００質量部に対して、１５質量部未満では、導電性エンドレスベルトとクリーニングブレードとの間の摩擦を十分に低減できないため、クリーニングブレードが摩耗して、クリーニング不良を十分に抑制できず、一方、３５質量部を超えると、基材層と表層との間の接着性が低下する。 The content of the solid lubricant is 15 to 35 parts by mass, preferably 20 to 30 parts by mass with respect to 100 parts by mass of the ultraviolet curable resin. If the solid lubricant content is less than 15 parts by mass with respect to 100 parts by mass of the UV curable resin, the friction between the conductive endless belt and the cleaning blade cannot be sufficiently reduced. In addition, the cleaning failure cannot be sufficiently suppressed. On the other hand, when it exceeds 35 parts by mass, the adhesion between the base material layer and the surface layer is lowered.
　前記固体潤滑剤は、粒径が２００～４００ｎｍの範囲であることが好ましい。固体潤滑剤の粒径が２００ｎｍ以上であれば、クリーニング不良を更に抑制でき、また、４００ｎｍ以下であれば、粒子の脱落による表面の欠陥を防ぐことができる。ここで、固体潤滑剤の粒径は、平均粒径であり、レーザー回折式粒度分布測定法で測定される粒度分布における積算値５０％での粒径を指す。 The solid lubricant preferably has a particle size in the range of 200 to 400 nm. If the particle size of the solid lubricant is 200 nm or more, poor cleaning can be further suppressed, and if it is 400 nm or less, surface defects due to dropout of particles can be prevented. Here, the particle size of the solid lubricant is an average particle size, and indicates a particle size at an integrated value of 50% in the particle size distribution measured by the laser diffraction particle size distribution measurement method.
　前記表層３には、導電性を調整するために、導電剤を適宜含有させることができる。ここで、表層３が導電剤を含む場合、導電剤としては、上述の基材層の項で例示した、電子導電剤、イオン導電剤等が挙げられる。該導電剤の添加量は、例えば、導電剤が電子導電剤の場合、該電子導電剤の添加量は、前記紫外線硬化樹脂１００質量部に対して、好ましくは１～１００質量部、より好ましくは１～８０質量部、より一層好ましくは５～５０質量部であり、また、導電剤がイオン導電剤の場合、該イオン導電剤の添加量は、前記紫外線硬化樹脂１００質量部に対して、好ましくは０．０１～１０質量部、より好ましくは０．０５～５質量部である。 The surface layer 3 can appropriately contain a conductive agent in order to adjust conductivity. Here, when the surface layer 3 contains a conductive agent, examples of the conductive agent include the electronic conductive agent and the ionic conductive agent exemplified in the above-mentioned section of the base material layer. For example, when the conductive agent is an electronic conductive agent, the added amount of the conductive agent is preferably 1 to 100 parts by weight, more preferably 100 parts by weight of the ultraviolet curable resin. 1 to 80 parts by mass, and even more preferably 5 to 50 parts by mass. When the conductive agent is an ionic conductive agent, the addition amount of the ionic conductive agent is preferably 100 parts by mass of the ultraviolet curable resin. Is 0.01 to 10 parts by mass, more preferably 0.05 to 5 parts by mass.
　前記表層３は、例えば、基材層２の上に、紫外線硬化樹脂と固体潤滑剤とを含む、表層形成用の原料組成物を塗布し、紫外線照射により硬化させて形成することができる。ここで、照度、積算光量等の紫外線照射の条件は、使用する紫外線硬化樹脂の種類や表層の厚さ等に応じて適宜調整することができる。 The surface layer 3 can be formed, for example, by applying a raw material composition for forming a surface layer containing an ultraviolet curable resin and a solid lubricant on the base material layer 2 and curing it by ultraviolet irradiation. Here, the conditions of ultraviolet irradiation such as illuminance and integrated light quantity can be appropriately adjusted according to the type of ultraviolet curable resin used, the thickness of the surface layer, and the like.
　前記表層形成用の原料組成物は、光重合開始剤を含むことが好ましい。表層形成用の原料組成物が光重合開始剤を含むことで、紫外線照射による硬化を促進することができる。該光重合開始剤としては、例えば、アセトフェノン、１－（４－ドデシルフェニル）－２－ヒドロキシ－２－メチルプロパン－１－オン、１－ヒドロキシシクロヘキシルフェニルケトン、２－ヒドロキシ－２－メチル－１－フェニル－１－プロパン－１－オン、１－（４－イソプロピルフェニル）－２－ヒドロキシ－２－メチル－プロパン－１－オン、２－メチル－１－〔４－（メチルチオ）フェニル〕－２－モルホリノプロパノン－１等のアセトフェノン類、ベンゾイン、ベンゾインメチルエーテル、ベンゾインエチルエーテル、ベンゾインイソプロピルエーテル等のベンゾインまたはベンゾインアルキルエーテル類、ベンゾフェノン、ベンゾイル安息香酸等の芳香族ケトン類、ベンジル等のα－ジカルボニル類、ベンジルジメチルケタール、ベンジルジエチルケタール等のベンジルケタール類、２，４－ジメチルチオキサントン、２－イソプロピルチオキサントン、２，４－ジイソプロピルチオキサントン等のチオキサントン類、１－フェニル－１，２－プロパンジオン－２－（ｏ－エトキシカルボニル）オキシム等のα－アシルオキシム類、２－メチルアントラキノン、２－エチルアントラキノン、２－ｔｅｒｔ－ブチルアントラキノン等のアントラキノン類、ｐ－ジメチルアミノ安息香酸エチル、ｐ－ジメチルアミノ安息香酸イソアミル等のアミン類等が挙げられる。これら光重合開始剤は、１種単独で用いてもよいし、２種以上を組み合わせて用いてもよい。前記光重合開始剤の使用量は、前記紫外線硬化樹脂１００質量部に対して、０．１～１０質量部の範囲が好ましい。 The raw material composition for forming the surface layer preferably contains a photopolymerization initiator. When the raw material composition for forming the surface layer contains a photopolymerization initiator, curing by ultraviolet irradiation can be promoted. Examples of the photopolymerization initiator include acetophenone, 1- (4-dodecylphenyl) -2-hydroxy-2-methylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1 -Phenyl-1-propan-1-one, 1- (4-isopropylphenyl) -2-hydroxy-2-methyl-propan-1-one, 2-methyl-1- [4- (methylthio) phenyl] -2 Acetophenones such as morpholinopropanone-1, benzoin or benzoin alkyl ethers such as benzoin, benzoin methyl ether, benzoin ethyl ether and benzoin isopropyl ether, aromatic ketones such as benzophenone and benzoylbenzoic acid, and α- such as benzyl Dicarbonyls, benzyldimethylketer Benzyl ketals such as benzyl diethyl ketal, thioxanthones such as 2,4-dimethylthioxanthone, 2-isopropylthioxanthone and 2,4-diisopropylthioxanthone, 1-phenyl-1,2-propanedione-2- (o-ethoxy Α-acyloximes such as carbonyl) oxime, anthraquinones such as 2-methylanthraquinone, 2-ethylanthraquinone and 2-tert-butylanthraquinone, amines such as ethyl p-dimethylaminobenzoate and isoamyl p-dimethylaminobenzoate And the like. These photoinitiators may be used individually by 1 type, and may be used in combination of 2 or more type. The amount of the photopolymerization initiator used is preferably in the range of 0.1 to 10 parts by mass with respect to 100 parts by mass of the ultraviolet curable resin.
　前記表層形成用の原料組成物は、更に、酸化防止剤、熱安定剤、可塑剤、光安定剤、滑剤、防曇剤、アンチブロッキング剤、スリップ剤、架橋剤、架橋助剤、接着剤、防汚剤、難燃剤、分散剤等の公知の添加剤を含有してもよい。これら添加剤の含有量は、それぞれ、前記紫外線硬化樹脂１００質量部に対して、０．０１～１０質量部の範囲が好ましい。 The raw material composition for forming the surface layer further includes an antioxidant, a heat stabilizer, a plasticizer, a light stabilizer, a lubricant, an antifogging agent, an antiblocking agent, a slip agent, a crosslinking agent, a crosslinking aid, an adhesive, You may contain well-known additives, such as an antifouling agent, a flame retardant, and a dispersing agent. The content of these additives is preferably in the range of 0.01 to 10 parts by mass with respect to 100 parts by mass of the ultraviolet curable resin.
　また、前記表層形成用の原料組成物は、塗工性の向上のために、メチルエチルケトン等の溶剤を含んでもよい。 In addition, the raw material composition for forming the surface layer may contain a solvent such as methyl ethyl ketone in order to improve the coatability.
　前記表層３は、厚さが２～８μｍであることが好ましい。表層３の厚さが２μｍ以上であれば、導電性エンドレスベルトの表面性が良好であり、また、８μｍ以下であれば、導電性エンドレスベルトの耐久性が優れる。 The surface layer 3 preferably has a thickness of 2 to 8 μm. If the thickness of the surface layer 3 is 2 μm or more, the surface property of the conductive endless belt is good, and if it is 8 μm or less, the durability of the conductive endless belt is excellent.
　本発明の導電性エンドレスベルトは、例えば、（１）基材層形成用の原料組成物を混練機により混練し、得られた混練物を環状ダイスを使って押出成形して基材層を形成し、（２）該基材層の外周面に、表層形成用の原料組成物を塗布し、紫外線硬化することで作製することができる。ここで、導電性エンドレスベルトの幅方向の切断は、押出成形による基材層の形成後であってもよいし、紫外線硬化による表層の形成後であってもよい。また、表層形成用の原料組成物の塗布には、スプレーコーティング、ディップコーティング、ロールコーティング、グラビアコーティング等の従来公知の塗布方法を用いることができる。 The conductive endless belt of the present invention is formed by, for example, (1) kneading a raw material composition for forming a base material layer with a kneader, and extruding the obtained kneaded material using an annular die to form a base material layer. And (2) It can produce by apply | coating the raw material composition for surface layer formation to the outer peripheral surface of this base material layer, and ultraviolet-curing. Here, the cutting in the width direction of the conductive endless belt may be after the formation of the base material layer by extrusion molding or after the formation of the surface layer by ultraviolet curing. Moreover, conventionally well-known coating methods, such as spray coating, dip coating, roll coating, and gravure coating, can be used for application | coating of the raw material composition for surface layer formation.
＜画像形成装置＞
　次に、本発明の導電性エンドレスベルトを組み込んだ画像形成装置の一実施形態を説明する。
　本発明の導電性エンドレスベルトは、図２に示す中間転写方式による画像形成装置等に用いることができる。 <Image forming apparatus>
Next, an embodiment of an image forming apparatus incorporating the conductive endless belt of the present invention will be described.
The conductive endless belt of the present invention can be used in an image forming apparatus or the like using the intermediate transfer system shown in FIG.
　図２は、中間転写方式の画像形成装置の印字部構成の一例の概略図であり、本発明の導電性エンドレスベルトは、中間転写部材１１として用いることができる。
　図２においては、感光体ドラム１２ａ，１２ｂ，１２ｃ，１２ｄ上の静電潜像をそれぞれイエロー、マゼンタ、シアン、ブラックにより現像する第１現像部１３ａ、第２現像部１３ｂ、第３現像部１３ｃ、第４現像部１３ｄが、中間転写部材１１に沿って順次配置されており、この中間転写部材１１を図中の矢印方向に循環駆動させて、各現像部１３ａ，１３ｂ，１３ｃ，１３ｄの感光体ドラム１２ａ，１２ｂ，１２ｃ，１２ｄ上に形成された４色のトナー像を順次転写することにより、中間転写部材１１上にカラーのトナー像を形成し、このトナー像を紙等の記録媒体１４上に転写することにより、プリントアウトを行う。記録媒体１４上への転写後に、中間転写部材１１上に残存するトナーは、クリーニング部１５のクリーニングブレード１６により掻き取られる。また、図２中、符号１７は、中間転写部材１１を循環駆動するための駆動ローラ（又はテンションローラ）を示し、符号１８は、２次転写ローラを示し、符号１９は、記録媒体送り装置を示し、符号２０は、記録媒体上の画像を加熱等により定着させる定着装置を示す。 FIG. 2 is a schematic diagram illustrating an example of a configuration of a printing unit of an intermediate transfer type image forming apparatus. The conductive endless belt of the present invention can be used as the intermediate transfer member 11.
In FIG. 2, a first developing unit 13a, a second developing unit 13b, and a third developing unit 13c that develop the electrostatic latent images on the photosensitive drums 12a, 12b, 12c, and 12d with yellow, magenta, cyan, and black, respectively. The fourth developing unit 13d is sequentially arranged along the intermediate transfer member 11, and the intermediate transfer member 11 is driven to circulate in the direction of the arrow in the drawing to expose the photosensitive portions of the developing units 13a, 13b, 13c, and 13d. By sequentially transferring the four color toner images formed on the body drums 12a, 12b, 12c, and 12d, a color toner image is formed on the intermediate transfer member 11, and this toner image is recorded on the recording medium 14 such as paper. Print out by transferring it up. After the transfer onto the recording medium 14, the toner remaining on the intermediate transfer member 11 is scraped off by the cleaning blade 16 of the cleaning unit 15. In FIG. 2, reference numeral 17 denotes a drive roller (or tension roller) for circulatingly driving the intermediate transfer member 11, reference numeral 18 denotes a secondary transfer roller, and reference numeral 19 denotes a recording medium feeding device. Reference numeral 20 denotes a fixing device for fixing an image on a recording medium by heating or the like.
　ここで、中間転写部材１１として、上述した本発明の導電性エンドレスベルトを用いることで、クリーニング不良を抑制できる。また、該導電性エンドレスベルトは、基材層と表層との接着性が高いため、中間転写部材１１の耐久性が向上し、長期に渡って優れた画像を安定的に形成することが可能となる。 Here, by using the above-described conductive endless belt of the present invention as the intermediate transfer member 11, it is possible to suppress a cleaning failure. In addition, since the conductive endless belt has high adhesion between the base material layer and the surface layer, the durability of the intermediate transfer member 11 is improved, and an excellent image can be stably formed over a long period of time. Become.
　以下に、実施例を挙げて本発明を更に詳しく説明するが、本発明は下記の実施例に何ら限定されるものではない。 Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to the following examples.
＜基材層の作製＞
　熱可塑性ポリブチレンナフタレート樹脂（ＰＢＮ、帝人社製、商品名「ＴＱＢ－ＯＴ」）８５質量部と、熱可塑性エラストマー（東洋紡社製、商品名「ペルプレンＥＮ－１６０００」）１５質量部と、カルボジイミド化合物（日清紡ケミカル社製、商品名「カルボジライトＨＭＶ－８ＣＡ」）０．３質量部と、カーボンブラック（アセチレンブラック、デンカ社製、商品名「デンカブラック」）１８～２０質量部と、を２軸混練機で混合分散して、ペレットを得た。
　得られたペレットを用いて、単軸押し出し機の先に円筒状のダイスを具えた成形機にて押出成形することにより、内径２５０ｍｍ、厚さ８０μｍ、幅２５０ｍｍにて、エンドレス形状のベルトの基材層を作製した。 <Preparation of base material layer>
85 parts by mass of thermoplastic polybutylene naphthalate resin (PBN, manufactured by Teijin Limited, trade name “TQB-OT”), 15 parts by mass of thermoplastic elastomer (trade name “Perprene EN-16000” manufactured by Toyobo Co., Ltd.), and carbodiimide Compound (Nisshinbo Chemical Co., Ltd., trade name “Carbodilite HMV-8CA”) 0.3 parts by mass and carbon black (acetylene black, Denka Co., Ltd., trade name “Denka Black”) 18-20 parts by mass Pellets were obtained by mixing and dispersing with a kneader.
Using the obtained pellets, the base of an endless belt having an inner diameter of 250 mm, a thickness of 80 μm, and a width of 250 mm is formed by extrusion using a molding machine equipped with a cylindrical die at the end of a single screw extruder. A material layer was prepared.
＜表層の作製＞
　上記のようにして作製した基材層の表面に、表１及び表２に示す配合の表層形成用組成物を、硬化後の厚さが表１及び表２に示す厚さになるようにスプレーコーティングにより塗布して、塗膜を形成した。
　なお、表層形成用組成物には、表１及び表２に示す紫外線硬化樹脂及び固体潤滑剤の他に、光重合開始剤（ＩＧＭ　Ｒｅｓｉｎｓ社製、商品名「Ｏｍｎｉｒａｄ１８４」）を５質量部、光重合開始剤（ＩＧＭ　Ｒｅｓｉｎｓ社製、商品名「Ｏｍｎｉｒａｄ８１９」）を０．５質量部、フッ素系添加剤（日油社製、商品名「モディパーＦ６０６」）を２質量部、フッ素系添加剤（ＤＩＣ社製、商品名「メガファックＲＳ－７２－Ｋ」）を３質量部、さらには導電性金属酸化物（レジノカラー工業社製）を１５質量部加えた。 <Production of surface layer>
Spray the surface layer-forming composition having the composition shown in Table 1 and Table 2 on the surface of the base material layer prepared as described above so that the thickness after curing becomes the thickness shown in Table 1 and Table 2. It was applied by coating to form a coating film.
In addition, in addition to the ultraviolet curable resin and the solid lubricant shown in Tables 1 and 2, the surface layer forming composition contains 5 parts by mass of a photopolymerization initiator (IGM Resins, trade name “Omnirad 184”), light 0.5 parts by mass of a polymerization initiator (IGM Resins, trade name “Omnirad 819”), 2 parts by weight of a fluorine additive (trade name “Modiper F606”, manufactured by NOF Corporation), a fluorine additive (DIC) 3 parts by mass of trade name “Megafac RS-72-K”) and 15 parts by mass of conductive metal oxide (manufactured by Resinocolor Kogyo Co., Ltd.) were added.
　次に、塗膜を、５０℃で２分間乾燥させた。
　次に、ライトハンマー６（へレウス製）を用いて、照度１００～７００ｍＷ／ｃｍ２、積算光量２００～３０００ｍＪ／ｃｍ２、窒素パージ下の条件で紫外線を照射して、塗膜を硬化させて、表層を形成した。
　その後、表層を＃２０００～＃６０００のラッピングフィルムで研磨し、導電性エンドレスベルトを得た。 Next, the coating film was dried at 50 ° C. for 2 minutes.
Next, using the write hammer 6 (to made Reus), illuminance 100 ~ 700mW / cm 2, accumulated light quantity 200 ~ 3000mJ / cm 2, was irradiated with ultraviolet light under conditions of a nitrogen purge, to cure the coating A surface layer was formed.
Thereafter, the surface layer was polished with a wrapping film of # 2000 to # 6000 to obtain a conductive endless belt.
＜評価＞
　上記のようにして得られた導電性エンドレスベルトに対して、以下の方法で、（１）摩擦係数変化、（２）接着性、（３）表面性、（４）耐久性を評価した。結果を表１及び表２に示す。 <Evaluation>
The conductive endless belt obtained as described above was evaluated for (1) friction coefficient change, (2) adhesion, (3) surface property, and (4) durability by the following methods. The results are shown in Tables 1 and 2.
（１）摩擦係数変化
　表面の摩擦係数は、表面性試験機Ｔｙｐｅ３８（新東科学製）に代表されるバランスアームを持つ装置を使用して測定する。端子には熱硬化ウレタンやＳＵＳボールを樹脂フィルムでくるんだ球体のものを用いてベルトと接触させ、端子とベルト間の動摩擦係数を測定する。端子の走査速度は６０ｍｍ／ｍｉｎ、荷重は５０ｇとしている。
　アクリル樹脂粒子とベルトを擦り、擦った部分と擦っていない部分の摩擦係数の差を評価基準とする。摩擦係数の差が小さい程、クリーニング不良を抑制できることを示す。
　樹脂粒子の擦り方は、ＦＰＲ２１００（レスカ製）に代表される摩擦摩耗試験機を用い、端子に樹脂微粒子（樹脂粒子は根上工業製アクリル粒子Ｊ－３ＰＹ、綜研化学製アクリル粒子ＭＸ－８０Ｈ３ｗＴ等の一般的なアクリル微粒子）をまぶしてベルト表面に接触させたのち、線速度１５０ｍｍ／ｓ、半径１５ｍｍ、荷重５０ｇで２０ｍｉｎ円運動させて実施した。評価基準を以下に示す。
　○：擦った部分と擦っていない部分の摩擦係数の差が０．１以下
　△：擦った部分と擦っていない部分の摩擦係数の差が０．１超０．２未満
　×：擦った部分と擦っていない部分の摩擦係数の差が０．２以上 (1) Friction coefficient change The friction coefficient of the surface is measured by using a device having a balance arm represented by a surface property tester Type 38 (manufactured by Shinto Kagaku). The terminal is brought into contact with the belt using a sphere made of thermosetting urethane or SUS ball wrapped with a resin film, and the coefficient of dynamic friction between the terminal and the belt is measured. The terminal scanning speed is 60 mm / min, and the load is 50 g.
The acrylic resin particles and the belt are rubbed, and the difference in coefficient of friction between the rubbed portion and the non-rubbed portion is used as an evaluation criterion. A smaller friction coefficient difference indicates that cleaning failure can be suppressed.
The resin particles were rubbed using a friction and wear tester represented by FPR2100 (manufactured by Reska), and resin fine particles (resin particles are Negami Kogyo Acrylic Particles J-3PY, Soken Chemicals Acrylic Particles MX-80H3wT, etc.) This was carried out by applying a general acrylic fine particle) to the surface of the belt and then moving it circularly for 20 min at a linear velocity of 150 mm / s, a radius of 15 mm, and a load of 50 g. The evaluation criteria are shown below.
○: Difference in friction coefficient between rubbed portion and non-rubbed portion is 0.1 or less △: Difference in friction coefficient between rubbed portion and non-rubbed portion is more than 0.1 and less than 0.2 ×: With rubbed portion Difference in coefficient of friction of non-rubbed part is 0.2 or more
（２）接着性
　基材層と表層との接着性の評価は、クロスカット法（ＪＩＳ－Ｋ５６００－５－６）に従って行った。具体的には、まず、各供試ベルトから切り出したサンプル表面に、カッターを用いて１ｍｍ間隔の切れ目を６本入れた後、この切れ目と直交するようにして１ｍｍ間隔の切れ目を６本入れて、５×５＝２５マスの切れ込みを形成した。この切れ込みの上からセロハンテープを貼り付け、よく密着させた後に剥がして、基材層上に残っている表層のマス目の数を数えて、接着性を評価した。評価基準を以下に示す。
　○：剥がれが全く見られない
　△：剥がれ部分が合計で１マス以下
　×：剥がれ部分が合計で１マス超 (2) Adhesiveness Evaluation of adhesiveness between the base material layer and the surface layer was performed according to a cross-cut method (JIS-K5600-5-6). Specifically, first, six cuts at 1 mm intervals were made on the sample surface cut out from each test belt using a cutter, and then six cuts at 1 mm intervals were made so as to be orthogonal to the cuts. 5 × 5 = 25 notches were formed. A cellophane tape was affixed from above the cut, peeled off after being closely adhered, and the number of cells on the surface layer remaining on the base material layer was counted to evaluate the adhesiveness. The evaluation criteria are shown below.
○: no peeling at all △: peeling part is less than 1 square in total ×: peeling part is more than 1 square in total
（３）表面性
　上記のようにして表層を形成し、研磨した後の導電性エンドレスベルトの表面（表層）の欠陥を確認し、評価した。具体的には、光学顕微鏡１００倍の視野で１０ｃｍ×１０ｃｍの範囲を観察し、剥がれ部分の数をカウントする。評価基準を以下に示す。
　○：無し
　△：１箇所～４箇所
　×：５箇所以上 (3) Surface property The surface layer was formed as described above, and defects on the surface (surface layer) of the conductive endless belt after polishing were confirmed and evaluated. Specifically, the range of 10 cm × 10 cm is observed with a 100 × field of view of the optical microscope, and the number of peeled portions is counted. The evaluation criteria are shown below.
○: None △: 1 to 4 locations ×: 5 or more locations
（４）耐久性
　ＭＩＴ耐折疲労試験機を用いて屈曲試験を実施し、荷重２ｋｇ、クランプのＲは１．５ｍｍとして、サンプルが破断するまでの屈曲回数をカウントすることで耐久性を評価した。評価基準を以下に示す。
　○：１００回以上
　△：１回以上９９回以下
　×：０回以下 (4) Durability A bending test was performed using an MIT folding fatigue tester, the load was 2 kg, the clamp R was 1.5 mm, and the durability was evaluated by counting the number of bendings until the sample broke. . The evaluation criteria are shown below.
○: 100 times or more △: 1 time or more and 99 times or less ×: 0 times or less
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
　＊１　ポリエステルアクリレート：　ダイセルオルネクス社製、商品名「ＥＢＥＣＲＹＬ１８３０」
　＊２　ウレタンアクリレート：　共栄社化学社製、商品名「ＵＡ－３０６Ｈ」
　＊３　アクリルアクリレート：　反応性アクリルポリマー、根上工業社製、商品名「ＡＨＣ９２０２ＭＩ８０」
　＊４　アクリルモノマー：　共栄社化学社製、商品名「ＤＰＥ－６Ａ」
　＊５　ＰＴＦＥ：　喜多村社製、商品名「ＫＴＬ５００Ｆ」、粒径＝０．３μｍ * 1 Polyester acrylate: Product name “EBECRYL1830”, manufactured by Daicel Ornex Co., Ltd.
* 2 Urethane acrylate: Kyoeisha Chemical Co., Ltd., trade name “UA-306H”
* 3 Acrylic acrylate: Reactive acrylic polymer, manufactured by Negami Kogyo Co., Ltd., trade name “AHC9202MI80”
* 4 Acrylic monomer: Kyoeisha Chemical Co., Ltd., trade name “DPE-6A”
* 5 PTFE: manufactured by Kitamura Co., Ltd., trade name “KTL500F”, particle size = 0.3 μm
　表１及び表２から、本発明に従う実施例の導電性エンドレスベルトは、クリーニング不良を抑制できる上、基材層と表層との間の接着性が良好であることが分かる。 From Tables 1 and 2, it can be seen that the conductive endless belts of the examples according to the present invention can suppress poor cleaning and have good adhesion between the base material layer and the surface layer.
　１：導電性エンドレスベルト、　２：基材層、　３：表層、　１１：中間転写部材、　１２ａ，１２ｂ，１２ｃ，１２ｄ：感光体ドラム、　１３ａ，１３ｂ，１３ｃ，１３ｄ：現像部、　１４：記録媒体、　１５：クリーニング部、　１６：クリーニングブレード、　１７：駆動ローラ（又はテンションローラ）、　１８：２次転写ローラ、　１９：記録媒体送り装置、　２０：定着装置 1: conductive endless belt, 2: base material layer, 3: surface layer, 11: intermediate transfer member, 12a, 12b, 12c, 12d: photosensitive drum, 13a, 13b, 13c, 13d: developing unit, 14: recording medium 15: Cleaning unit 16: Cleaning blade 17: Drive roller (or tension roller) 18: Secondary transfer roller 19: Recording medium feeding device 20: Fixing device

Claims (4)

  1. 　画像形成装置に用いられる無端ベルト状の導電性エンドレスベルトであって、
    　基材層と、該基材層の外周面上に配設された表層と、を具え、
    　前記表層が、紫外線硬化樹脂と、固体潤滑剤と、を含み、該固体潤滑剤の含有量が、前記紫外線硬化樹脂１００質量部に対して、１５～３５質量部であることを特徴とする、導電性エンドレスベルト。     An endless belt-like conductive endless belt used in an image forming apparatus,
    A base material layer, and a surface layer disposed on the outer peripheral surface of the base material layer,
    The surface layer includes an ultraviolet curable resin and a solid lubricant, and the content of the solid lubricant is 15 to 35 parts by mass with respect to 100 parts by mass of the ultraviolet curable resin. Conductive endless belt.
  2. 　前記固体潤滑剤が、ポリテトラフルオロエチレン（ＰＴＦＥ）及び二硫化モリブデンからなる群から選択される少なくとも一種である、請求項１に記載の導電性エンドレスベルト。 The conductive endless belt according to claim 1, wherein the solid lubricant is at least one selected from the group consisting of polytetrafluoroethylene (PTFE) and molybdenum disulfide.
  3. 　前記紫外線硬化樹脂が、アクリルアクリレート、ウレタンアクリレート及びアクリルモノマーからなる群から選択される少なくとも一種である、請求項１又は２に記載の導電性エンドレスベルト。 The conductive endless belt according to claim 1 or 2, wherein the ultraviolet curable resin is at least one selected from the group consisting of acrylic acrylate, urethane acrylate and acrylic monomer.
  4. 　前記表層は、厚さが２～８μｍである、請求項１～３のいずれか一項に記載の導電性エンドレスベルト。 The conductive endless belt according to any one of claims 1 to 3, wherein the surface layer has a thickness of 2 to 8 袖 m.
PCT/JP2019/018433 2018-05-28 2019-05-08 Conductive endless belt WO2019230316A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5625746A (en) * 1979-08-07 1981-03-12 Canon Inc Image retaining material
JP2005181767A (en) * 2003-12-19 2005-07-07 Kaneka Corp Method for manufacturing polyimide endless belt
JP2013142878A (en) * 2012-01-12 2013-07-22 Bridgestone Corp Conductive endless belt
JP2016114907A (en) * 2014-12-18 2016-06-23 富士ゼロックス株式会社 Conductive elastic belt, conductive elastic belt unit, image formation device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5625746A (en) * 1979-08-07 1981-03-12 Canon Inc Image retaining material
JP2005181767A (en) * 2003-12-19 2005-07-07 Kaneka Corp Method for manufacturing polyimide endless belt
JP2013142878A (en) * 2012-01-12 2013-07-22 Bridgestone Corp Conductive endless belt
JP2016114907A (en) * 2014-12-18 2016-06-23 富士ゼロックス株式会社 Conductive elastic belt, conductive elastic belt unit, image formation device

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