JP5268403B2 - 電子写真機器用無端ベルトおよびその製法 - Google Patents
電子写真機器用無端ベルトおよびその製法 Download PDFInfo
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- JP5268403B2 JP5268403B2 JP2008081529A JP2008081529A JP5268403B2 JP 5268403 B2 JP5268403 B2 JP 5268403B2 JP 2008081529 A JP2008081529 A JP 2008081529A JP 2008081529 A JP2008081529 A JP 2008081529A JP 5268403 B2 JP5268403 B2 JP 5268403B2
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- Japan
- Prior art keywords
- base layer
- endless belt
- resin
- polyhydric alcohol
- electrophotographic apparatus
- 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.)
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Images
Landscapes
- Electrophotography Configuration And Component (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
Description
(A)芳香族イソシアネート化合物。
(B)芳香族系多価カルボン酸の無水物。
(C)カルボン酸両末端ポリマーおよびフッ素含有低分子量有機化合物の少なくとも一方。
(D)多価アルコール。
(A)芳香族イソシアネート化合物。
(B)芳香族系多価カルボン酸の無水物。
(C)カルボン酸両末端ポリマーおよびフッ素含有低分子量有機化合物の少なくとも一方。
(D)多価アルコール。
日本ポリウレタン社製、ミリオネートMT(Mn:250.26)
日本曹達社製、TODI/R203(Mn:264.29)
無水トリメリット酸(Mn:192.12)
3−メチル−1,5−ペンタンジオールとセバシン酸とを縮合して得られるカルボン酸両末端ポリエステル(酸価:56mgKOH/g、Mn:2000)
前記構造式(4a)で表されるフッ素系界面活性剤(OMNOVA社製、PF636、Mn:1122、OH価:100mgKOH/g)
前記構造式(4b)で表されるフッ素系界面活性剤(OMNOVA社製、PF6320、Mn:3698、OH価:33mgKOH/g)
グリセリン(分子量:92、沸点:290℃、OH価:3mgKOH/g)
エチレングリコール(分子量:62、沸点:197℃、OH価:2mgKOH/g)
トリメチロールプロパン(分子量:134、沸点:292℃、OH価:3mgKOH/g)
昭和キャボット社製、ショウブラックN220
(基層の作製)
撹拌機,窒素導入管,温度計および冷却管を備えた反応容器に、後記の表1に示す*印の付いた材料を同表に示す割合で配合し、窒素気流下、撹拌しながら1時間かけて130℃まで昇温し、そのまま130℃で約5時間反応させた後反応を停止し、PAI−NMP溶液(固形分濃度:24重量%)を調製した。つぎに、このPAI−NMP溶液に、後記の表1に示す*印の付いていない材料(カーボンブラック)を同表に示す割合で配合し、撹拌羽根で混合した後、ボールミル分散させて基層用材料を調製した。つぎに、金型(円筒形基体)を準備し、この表面に上記基層用材料をスプレーコーティングして、金型の表面に基層を形成し、250℃で2時間加熱処理をした。つぎに、基層と円筒形基体との間にエアーを吹き付けることにより、円筒形基体を抜き取り、基層を作製した。
下記の表1に示すように、反応液(多価アルコール)中に、上記基層をディッピングし、水素生成反応を行った(反応時間:3時間、反応温度:80℃)。つぎに、この基層を上記反応液(多価アルコール)から取り出し、反応液を拭き取った後、基層の表裏面をアセトンで洗浄した。このようにして、基層(厚み:80μm)のみからなる単層構造の無端ベルトを作製した。
(基層の作製)
後記の表1および表2に示す材料を同表に示す割合で配合する以外は、実施例1と同様にして、基層用材料を調製した。そして、この基層用材料を用いて、実施例1に準じて、基層を作製した。
後記の表1および表2に示す反応液(多価アルコール)、反応条件(反応時間、反応温度)に変更する以外は、実施例1に準じて、反応を行った。これにより、基層(厚み:80μm)のみからなる単層構造の無端ベルトを作製した。
水素生成反応を行わない以外は、実施例1に準じて、無端ベルトを作製した。すなわち、後記の表3に示す材料を同表に示す割合で配合する以外は、実施例1と同様にして、基層用材料を調製した。つぎに、金型(円筒形基体)を準備し、この表面に上記基層用材料をスプレーコーティングして、金型の表面に基層を形成し、250℃で2時間加熱処理をした。つぎに、基層と円筒形基体との間にエアーを吹き付けることにより、円筒形基体を抜き取り、基層(厚み:80μm)のみからなる単層構造の無端ベルトを作製した。
ガスクロマトグラフ質量分析にて、試料(無端ベルトの基層)に含有される反応液(多価アルコール)の定量を行い、試料(無端ベルトの基層)の重量から多価アルコール含有率(重量%)を算出した。
図2に示すように、無端ベルトを25mm×150mmの大きさに切断して、短冊状のテストピース20を作製した。このテストピース20を、直径13mmの金属製パイプ21に巻き付けた後、テストピース20の端部同士を重ね合わせ、ここに0.5kgのオモリ(図示せず)をかけて吊るし、50℃×95%RHの環境下、24時間放置した。つぎに、オモリを外し、図3に示すように、重ね合わせたテストピース20の両端を開放した後、テストピース20の円弧状部分を中心に、これを挟む左右のテストピース20の表面を上方に延長させたと仮想し、その左右仮想延長部23で作った角度θを、開き角度θとして測定した。この開き角度θが180°に近い方(好ましくは、90°以上)が、曲がり癖(カール癖)が少ないことを示している。
図5に示すように、得られた無端ベルト1を、金属製パイプ2(外径35mm),金属製パイプ3(外径19mm),金属製パイプ3(外径19mm)に巻き付けた後、8kg重(片側4kg重)のオモリ(図示せず)を吊るし、45℃×90%の環境下で10日間放置した。その後、無端ベルトの表面を目視で観察した。評価は、しわがないものを○、軽微なうねりがあるが実用上問題ないものを△、しわがあるものを×とした。
図5に示すように、得られた無端ベルト1を、金属製パイプ2(外径35mm),金属製パイプ3(外径19mm),金属製パイプ3(外径19mm)に巻き付けた後、8kg重(片側4kg重)のオモリ(図示せず)を吊るし、45℃×90%の環境下で10日間放置した。その後、無端ベルトを市販のフルカラー電子写真複写機(リコー社製、imagio MPC2500) に組み込み、画出し評価を行った。評価は、2色グリーンべた画像(イエロー・シアンのみ)に異常がないものを○、しわ跡等の異常があるものを×とした。
2 金属製パイプ(外径35mm)
3 金属製パイプ(外径19mm)
Claims (5)
- 少なくとも基層を備えた電子写真機器用無端ベルトであって、上記基層が、下記の(A)〜(C)を必須成分とするポリアミドイミド樹脂を用いて形成され、上記基層中に下記の(D)が含有されていることを特徴とする電子写真機器用無端ベルト。
(A)芳香族イソシアネート化合物。
(B)芳香族系多価カルボン酸の無水物。
(C)カルボン酸両末端ポリマーおよびフッ素含有低分子量有機化合物の少なくとも一方。
(D)多価アルコール。 - 上記(D)の多価アルコールが、グリセリン、エチレングリコールおよびトリメチロールプロパンからなる群から選ばれた少なくとも一つである請求項1記載の電子写真機器用無端ベルト。
- 上記基層中の上記(D)の含有率が1.7重量%以上である請求項1または2記載の電子写真機器用無端ベルト。
- 上記基層の外周面に直接もしくは他の層を介して表層が形成され、上記表層がフッ素樹脂を含有する請求項1〜3のいずれか一項に記載の電子写真機器用無端ベルト。
- 請求項1〜4のいずれか一項に記載の電子写真機器用無端ベルトの製法であって、上記(A)〜(C)を必須成分とするポリアミドイミド樹脂を用いて基層を形成した後、上記(D)を含有する反応液中に上記基層を浸漬して、上記ポリアミドイミド樹脂中に水素結合を生成させることを特徴とする電子写真機器用無端ベルトの製法。
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