JP2005164673A5 - Endless belt for electrophotographic apparatus and manufacturing method thereof, belt cartridge, process cartridge, and image forming apparatus - Google Patents

Endless belt for electrophotographic apparatus and manufacturing method thereof, belt cartridge, process cartridge, and image forming apparatus Download PDF

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JP2005164673A5
JP2005164673A5 JP2003400052A JP2003400052A JP2005164673A5 JP 2005164673 A5 JP2005164673 A5 JP 2005164673A5 JP 2003400052 A JP2003400052 A JP 2003400052A JP 2003400052 A JP2003400052 A JP 2003400052A JP 2005164673 A5 JP2005164673 A5 JP 2005164673A5
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endless belt
electrophotographic apparatus
belt
rubber particles
electrophotographic
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本発明の目的は、上記のような課題に鑑み、安価に製造でき、長期間使用しても亀裂や割れがなく、耐久性に優れ、成形後の寸法変化の少ない電子写真装置用エンドレスベルト並びにその製造方法を提供することである。 SUMMARY OF THE INVENTION In view of the above-described problems, inexpensive to manufacture, long-term without any crack or cracks also be used, durable, small endless electrophotographic apparatus of dimensional change belt after molding and The manufacturing method is provided.

本発明に従って、アクリル樹脂中に、ゴム粒子と、導電性フィラーとが分散している樹脂組成物からなる層を有する電子写真装置用エンドレスベルトであって、該導電性フィラーは、該アクリル樹脂側に局在していることを特徴とする電子写真用エンドレスベルトが提供される。
また、本発明に従って、アクリル樹脂に対してゴム粒子と、導電性フィラーとを各々添加して得た樹脂組成物を溶融成形して筒状のフィルムを成形する工程を含む電子写真装置用エンドレスベルトの製造方法が提供される
In accordance with the present invention, in the A acrylic resin, and rubber particles, and the conductive filler is a electrophotographic endless belt device having a layer comprising a resin composition dispersed, conductive filler, said acrylic resin An endless belt for electrophotography, characterized in that it is localized on the side, is provided.
Further, according to the present invention, an endless belt for an electrophotographic apparatus comprising a step of melt-molding a resin composition obtained by adding rubber particles and a conductive filler to an acrylic resin to form a cylindrical film A manufacturing method is provided .

以上のように、本発明によれば、安価に製造でき、耐クリープ性、耐屈曲性、寸法安定性に優れ、長期にわたって使用できる耐久性に優れた電子写真装置用エンドレスベルト並びにその製造方法、この電子写真装置用エンドレスベルトを備えたベルトカートリッジ、プロセスカートリッジ及び画像形成装置を提供することが可能となった。 As described above, according to the present invention, an endless belt for an electrophotographic apparatus that can be manufactured at low cost, has excellent creep resistance, flex resistance, dimensional stability, and can be used over a long period of time, and a method for manufacturing the same , It has become possible to provide a belt cartridge, a process cartridge, and an image forming apparatus provided with the endless belt for an electrophotographic apparatus.

本発明では、アクリル樹脂の他に耐屈曲性向上のためにゴム成分を添加する。従来から、耐衝撃性を向上する目的で熱可塑性樹脂にゴム成分を添加するのは一般的に行われてきており、例えばHIPS(ハイインパクトポリスチレン)やABS(アクリロニトリル−ブタジエン−スチレン共重合体)等が例示できる。しかし、あくまで耐衝撃性とエンドレスベルトとしての耐屈曲性とは異なるものであり、本発明らの検討によれば、耐衝撃性に優れた材料を使用してエンドレスベルトにしても、必ずしも耐屈曲性が優れているとは限らないという結果が得られた。 In the present invention, in addition to the acrylic resin, a rubber component is added to improve the bending resistance. Conventionally, it has been generally performed to add a rubber component to a thermoplastic resin for the purpose of improving impact resistance. For example, HIPS (high impact polystyrene) and ABS (acrylonitrile-butadiene-styrene copolymer) are used. Etc. can be illustrated. However, the impact resistance and the bending resistance as an endless belt are different from each other. According to the study by the present inventors, even if an endless belt is made using a material having excellent impact resistance, the bending resistance is not necessarily limited. The result that it was not necessarily excellent in the property was obtained.

本発明では、耐屈曲性向上のためにゴム粒子を添加するが、バインダーであるアクリル樹脂への分散性を考慮するとゴム粒子の粒径は0.05μm〜10μmが好ましい。0.05μm未満では粒径が小さ過ぎてゴム粒子同士が凝集し易くなってしまい、かえって分散性が悪化してしまう。10μmを超えては粒径が大き過ぎてゴム部分と樹脂部分とが分離し過ぎ、機械物性の低下を招いてしまう。なお、本発明のゴム粒子の粒径とは一次粒子径のことを指し、一次粒子が凝集した凝集粒子の径を指すものではない。 In the present invention, rubber particles are added to improve the bending resistance, but the particle size of the rubber particles is preferably 0.05 μm to 10 μm in consideration of dispersibility in an acrylic resin as a binder. If it is less than 0.05 μm, the particle size is too small and the rubber particles tend to aggregate, and the dispersibility deteriorates. If it exceeds 10 μm, the particle size is too large and the rubber part and the resin part are separated too much, leading to a decrease in mechanical properties. The particle diameter of the rubber particles of the present invention refers to the primary particle diameter, and does not refer to the diameter of the aggregated particles in which the primary particles are aggregated.

通常、ゴム粒子を添加したアクリル樹脂は、樹脂がマトリックスやゴムがドメインの構造をなす。好ましい樹脂とゴム成分との配合比は、30:70〜95:5の範囲である。95%よりも樹脂成分が多くなってしまってはゴム成分の添加による耐屈曲性に及ぼす効果が不十分であり、逆に70%よりもゴム成分が多くなってしまっては、ドメインであるゴム粒子同士の間を埋めるマトリックスである樹脂が不足気味で、成形性が悪いばかりでなく、機械特性がゴムに近くなってしまい、ベルトとして使用したときに伸びたり、クリープしたりして好ましくない。 Usually, an acrylic resin to which rubber particles are added has a structure in which the resin is a matrix and the rubber is a domain. The compounding ratio of the preferred resin and rubber component is in the range of 30:70 to 95: 5. If the resin component is more than 95%, the effect on the bending resistance due to the addition of the rubber component is insufficient. Conversely, if the rubber component is more than 70%, the domain rubber The resin that is a matrix that fills the space between particles is not sufficient, and not only the moldability is poor, but also the mechanical properties are close to rubber, which is not preferable because it stretches or creeps when used as a belt.

本発明においては、耐屈曲性向上のためにゴム成分を添加するが、ゴム成分の添加方法については特に制限はない。アクリル樹脂であるポリマー重合時に添加してもよいし、ポリマーとなった後にゴム成分と混合しても構わない。 In the present invention, a rubber component is added to improve the bending resistance, but the method for adding the rubber component is not particularly limited. You may add at the time of polymer polymerization which is an acrylic resin, and you may mix with a rubber component after becoming a polymer.

通常、アクリル樹脂はそれ自体絶縁材料であり、単体では電子写真装置のエンドレスベルトとしては機能しないことが多く、電気抵抗を調整するために導電剤や帯電防止剤を添加して使用する。例えば、導電性フィラーとしては、カーボンブラックや各種の導電性金属酸化物等が挙げられ、非フィラー系抵抗調整剤としては、各種金属塩やグリコール類等の低分子量のイオン導電剤やエーテル結合や水酸基等を分子内に含んだ帯電防止樹脂、又は電子導電性を示す有機高分子化合物等が挙げられる。これによって、本発明の電子写真エンドレスベルトの電気抵抗値を調節するために混合する添加剤は、特に制限されるものではない。なかでも、カーボンブラックは比較的安価であり、少量で抵抗調整が可能といった点で好ましい。 Usually, an acrylic resin is an insulating material itself and often does not function as an endless belt of an electrophotographic apparatus, and a conductive agent or an antistatic agent is added to adjust electric resistance. For example, examples of the conductive filler include carbon black and various conductive metal oxides, and examples of the non-filler resistance adjuster include low molecular weight ionic conductive agents such as various metal salts and glycols, ether bonds, and the like. Examples thereof include an antistatic resin containing a hydroxyl group in the molecule, an organic polymer compound exhibiting electronic conductivity, and the like. Accordingly, the additive to be mixed for adjusting the electric resistance value of the electrophotographic endless belt of the present invention is not particularly limited. Among these, carbon black is preferable because it is relatively inexpensive and can be adjusted in a small amount.

通常、カーボンブラックのような導電剤を用い、添加量を増加していくと急激に電気抵抗値が下がる変曲点が存在し、電子写真プロセスに必要とされる中抵抗領域のものを安定して製造することが困難であるが、本発明のようにアクリル樹脂中にゴム成分を添加することによってカーボンブラックをアクリル樹脂側に局在化させ、それをゴム成分で薄めるというような抵抗制御を行うことによって、非常に安定して中抵抗領域の樹脂組成物が得られるといったメリットもある。 Usually, a conductive agent such as carbon black is used, and there is an inflection point where the electrical resistance value suddenly decreases as the amount added is increased, stabilizing the medium resistance region required for the electrophotographic process. it is difficult to produce Te, but is localized in the acrylic resin side of the carbon black by adding a rubber component in the acrylic resin as in the present invention, the resistance control such as dilute a rubber component it By doing so, there is also a merit that a resin composition in the middle resistance region can be obtained very stably.

アクリル樹脂、導電剤及び添加剤等の材料を所望の処方に基づき、予備混合後、2軸押出機等で混練分散させ成形用原料としてもよいし、各々の材料を直接成形機に投入して成形を行ってもよい。
Based on the desired formulation, materials such as acrylic resin, conductive agent, and additive may be premixed and then kneaded and dispersed with a twin screw extruder or the like as a raw material for molding, or each material may be put directly into the molding machine. Molding may be performed.

Claims (15)

アクリル樹脂中に、ゴム粒子と、導電性フィラーとが分散している樹脂組成物からなる層を有する電子写真装置用エンドレスベルトであって、該導電性フィラーは、該アクリル樹脂側に局在していることを特徴とする電子写真装置用エンドレスベルト In an acrylic resin, and rubber particles, and the conductive filler is a electrophotographic endless belt device having a layer comprising a resin composition dispersed, conductive fillers, localized in the acrylic resin side An endless belt for an electrophotographic apparatus . 前記ゴム粒子の粒子径が0.05μm〜10μmである請求項1に記載の電子写真装置用エンドレスベルト。 The endless belt for an electrophotographic apparatus according to claim 1, wherein the rubber particles have a particle diameter of 0.05 μm to 10 μm. 前記アクリル樹脂と前記ゴム粒子との配合比が質量比で30:70〜95:5である請求項1又は2に記載の電子写真装置用エンドレスベルト。 The endless belt for an electrophotographic apparatus according to claim 1 or 2, wherein a mixing ratio of the acrylic resin and the rubber particles is 30:70 to 95: 5 by mass ratio. 前記ゴム粒子は多層構造である請求項1〜3のいずれかに記載の電子写真装置用エンドレスベルト。 The endless belt for an electrophotographic apparatus according to claim 1, wherein the rubber particles have a multilayer structure. 前記ゴム粒子はアクリルゴムを主成分とする請求項1〜4のいずれかに記載の電子写真装置用エンドレスベルト。 The endless belt for an electrophotographic apparatus according to claim 1, wherein the rubber particles are mainly composed of acrylic rubber. 前記導電性フィラーが、電子導電系フィラーである請求項1〜5のいずれかに記載の電子写真装置用エンドレスベルト。The endless belt for an electrophotographic apparatus according to claim 1, wherein the conductive filler is an electroconductive filler. 前記電子導電系フィラーが、カーボンブラックである請求項に記載の電子写真装置用エンドレスベルト。 The endless belt for an electrophotographic apparatus according to claim 6 , wherein the electroconductive filler is carbon black. 前記樹脂組成物が、更にポリエーテルエステル、ポリエーテルアミド又はポリエーテルエステルアミドを含有している請求項1〜のいずれかに記載の電子写真装置用エンドレスベルト。 It said resin composition further polyetherester, polyetheramide, or an electrophotographic apparatus for endless belt according to any one of claims 1 to 7 containing polyetheresteramide. エンドレスベルトが転写搬送ベルト又は中間転写ベルトである請求項1〜のいずれかに記載の電子写真装置用エンドレスベルト。 The endless belt for an electrophotographic apparatus according to any one of claims 1 to 8 , wherein the endless belt is a transfer conveyance belt or an intermediate transfer belt. 前記樹脂組成物が、アクリル樹脂に対してゴム粒子と、導電性フィラーとを各々添加して得られたものである請求項1〜9のいずれかに記載の電子写真装置用エンドレスベルト。 Said resin composition, rubber particles and electrophotographic apparatus for endless belt according to any one of claims 1 to 9 is obtained and a conductive filler each addition of the acrylic resin. アクリル樹脂に対してゴム粒子と、導電性フィラーとを各々添加して得た樹脂組成物を溶融成形して筒状のフィルムを成形する工程を含む電子写真装置用エンドレスベルトの製造方法。A process for producing an endless belt for an electrophotographic apparatus, comprising a step of melt-molding a resin composition obtained by adding rubber particles and a conductive filler to an acrylic resin to form a cylindrical film. 前記工程が、前記樹脂組成物をインフレーション成形する工程、又はインジェクションブロー成形する工程を含む請求項11に記載の電子写真装置用エンドレスベルトの製造方法。The method for producing an endless belt for an electrophotographic apparatus according to claim 11, wherein the step includes a step of performing blow molding of the resin composition or a step of performing blow molding. 請求項1〜10のいずれかの電子写真装置用エンドレスベルトを備えていることを特徴とするベルトカートリッジ。 Belt cartridge, characterized by comprising one of the electrophotographic endless belt according to claim 1-10. 請求項1〜10のいずれかの電子写真装置用エンドレスベルトを備えていることを特徴とするプロセスカートリッジ。 The process cartridge characterized by comprising any one of the endless belt for an electrophotographic apparatus according to claim 1-10. 請求項1〜10のいずれかに記載の電子写真装置用エンドレスベルトを備えていることを特徴とする画像形成装置 An image forming apparatus comprising the endless belt for an electrophotographic apparatus according to claim 1 .
JP2003400052A 2003-11-28 2003-11-28 Endless belt for electrophotographic apparatus and manufacturing method thereof, belt cartridge, process cartridge, and image forming apparatus Expired - Fee Related JP4366180B2 (en)

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JP2008268864A (en) * 2007-03-27 2008-11-06 Tokai Rubber Ind Ltd Conductive roll for electrophotographic apparatus
JP4701311B2 (en) * 2009-09-17 2011-06-15 キヤノン株式会社 Electrophotographic belt and electrophotographic apparatus

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