JP3963425B2 - Reproduction method of electrophotographic photosensitive member - Google Patents

Reproduction method of electrophotographic photosensitive member Download PDF

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JP3963425B2
JP3963425B2 JP2001317553A JP2001317553A JP3963425B2 JP 3963425 B2 JP3963425 B2 JP 3963425B2 JP 2001317553 A JP2001317553 A JP 2001317553A JP 2001317553 A JP2001317553 A JP 2001317553A JP 3963425 B2 JP3963425 B2 JP 3963425B2
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electrophotographic
photosensitive member
photosensitive layer
electrophotographic photosensitive
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JP2003122031A (en
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純一 山崎
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Ricoh Co Ltd
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Ricoh Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、電子写真感光体の再生方法、特に感光層を剥離した剥離液からその成分を分離する方法に関し、塗膜剥離方法に応用される。
【0002】
【従来の技術】
電子写真感光体の基体再生に関するものとしては、特開2000−010302号公報に、下引き層が熱硬化性樹脂にて形成された円筒状電子写真用機能分離型有機感光体の塗膜を除去して再生するセンターレス式円筒研磨装置であって、センターレス式円筒研磨装置の被加工物を支持するワークレストをローラによる回転接触とし、回転駆動を与える調整車とそのローラ式ワークレストの間に被加工物を押し付けるための押えローラを配置したことを特徴とするセンターレス式円筒研磨装置が記載され、特開2000−221704号公報には、基体上に少なくとも下引き層及び感光層を積層させてなる感光体から、前記感光体上の積層物を除去させて前記基体を再利用するに際して、前記積層物を剥離液で一度に膨潤・剥離させるか又は上層の前記感光層を溶解除去させた後、下引き層を前記剥離液で膨潤・剥離させるかして、基体表面を露出させた後、洗浄液を含浸する部材で摺擦処理する感光体用基体の再生方法が記載され、特開2000−275867号公報には、導電性基体上に有機系機能材料膜を形成して製造される有機系電子写真用感光体の製造、検査工程で発生する機能材料成膜の不良品、仕損品、または使用済の寿命品から導電性基体を再生する方法において、前記不良品、仕損品または寿命品を、水分含有率x重量%および浴温y℃が次式、y>3x+25で表わされる関係を満たすN−メチルピロリドン浴中に浸漬することにより、導電性基体から有機系機能材料膜を剥離、溶解除去することが記載され、特開2000−275868号公報には、感光体(7)の塗膜に塗膜切込装置(2)で切り込みを入れ、塗膜に切り込みを入れた感光体(7)を、塗膜分離剤として一定温度の水を貯留した塗膜分離水浴槽(8)に一定時間浸漬し、導電性基体から塗膜を分離して、感光体(7)の導電性基体表面に疵等を付けずに有機溶剤では溶出や溶解しにくい下引層を有する塗膜を確実に除去することが記載され、特開2000−314965号公報には、感光体(4)を浸漬(1)の膨潤剥離液に浸漬して感光層と下引層を膨潤させてから、剥離装置(2)で膨潤した感光層と下引層の膜の一端を保持して螺旋状に引剥がして除去することが記載され、特開平05−181289号公報には、有機感光体の有機被膜除去方法は、少なくともカルボン酸、フェノール系化合物およびケトン系化合物を含む処理液を用いて、基体上に形成された有機被膜を処理することを特徴とし、この方法により、再使用可能な有機感光体再生用基体が得られることが記載され、特開平05−341537号公報には、基体上に、少なくとも下引き層と感光層を順次積層してなる電子写真感光体において、使用済み電子写真感光体の感光層のみを溶解、切削または剥離により取り除き、該使用済み電子写真感光体の下引き層の上に再び感光層を形成することを特徴とする電子写真感光体の再生方法が記載され、特開平06−043663号公報には、基体表面にポリアミド樹脂を含有する下引き層を介して感光層が設けられた電子写真感光体を、水中に浸漬するか、または高湿度雰囲気中で加湿した後、基体表面から感光層を下引き層と共に剥離することが記載され、特開平07−271058号公報には、肉厚0.4mm以上のステンレス鋼製基体の表面に感光層が形成されたOPCドラムが使用済みになった後、感光層を溶解して除去し、再び感光層を形成して新しいOPCドラムとして使用する。基体表面に硬化下引き層が形成されている場合には、下引き層上の感光層のみを溶解除去することが記載され、特開平08−146623号公報には、感光塗膜除去後の導電性基体上に残存する下引塗膜を酸化性酸で処理する酸化分解工程を含むことを特徴とし、同工程の装置と、酸化性酸で処理後の下引塗膜に有機溶剤を含浸させる装置と、処理後の下引塗膜を機械的外力によって除くと共に基体を洗浄する水洗装置を含むことを特徴とする電子写真感光体からの導電性基体再生装置、及び前記の装置から有機溶剤を含浸させる装置を除いた電子写真感光体からの導電性基体再生装置が記載され、特開平09−146287号公報には、TEA−CO2レーザの線状ビーム(6)で感光体ドラムのポリカーボネードで形成した導電体(3)及び感光体(4)を除去すると同時に、残った最下層の絶縁体(2)をエキシマレーザの線状ビーム(7)で除去するようにしたことが記載され、特開平09−179326号公報には、肉厚0.3mm以上のようなステンレス鋼パイプ基体の表面に感光層が形成されたOPCドラムから、この感光層のみを、このドラムへのメラミンアルキッド樹脂のような粒子の噴射衝突により除去してステンレス鋼パイプ基体を得る工程と、この基体の表面に感光層を形成してOPCドラムを得る工程とからなることが記載され、特開平09−211875号公報には、織布の表面に有機溶剤を供給し、この有機溶剤含有の織布を電子写真感光体の周面の全部又は一部に接触又は圧接して、該電子写真感光体の導電性基体上に形成されている導電層、下引き層、感光層などの塗膜を除去するとともに、この塗膜残渣を除去した織布に有機溶剤を含有させ、ブラシを宛てがい塗膜残渣を掻きとって該織布を清浄にする操作を繰り返し行なうことを特徴とする電子写真感光体の塗膜除去方法が記載され、特開平10−177254号公報には、ステンレス鋼製ドラム基体の表面に有機感光層が形成された有機光電体ドラムを600℃〜1200℃に高温加熱処理して、該パイプ基体表面から不要な有機感光層を除去する工程と、不要な有機感光層を除去したドラム基体の表面に新たな有機感光層を形成する工程と、を有する技術が記載され、特開平10−213911号公報には、アルミ製の下地(1)の上にシランカップリング層(2)、荷電発生層(3)、電荷移動層(4)などからなる基材外層部(5)を付着させてなるOPCドラムから基材外層部(5)を一工程で除去する除去液を提供し、その除去液は、有機溶剤及び水の混合液にカルボン酸を0.1〜3%添加させたものであることが記載され、特開平11−024288号公報には、導電性基体上に感光層を有する使用済のOPCドラムから、誘電率が20以上であり、かつ双極子モーメントが3以上の非プロトン性極性溶媒を含有する溶剤を用いて感光層を除去し、次いで、精製水を用いて洗浄した後、再び新しい感光層を形成させるOPCドラムの再生方法であり、上記の非プロトン性極性溶媒としては、ジメチルスルホキシドを用いることが好ましく、また、その非プロトン性極性溶媒を含有する溶剤としては、ジメチルスルホキシドと無機酸との混合物を用いることが好ましく、さらに、感光層の除去に用いた溶剤は、蒸留して再使用することが好ましいことが記載され、特開平11−295908号公報には、下引き層が熱硬化性樹脂にて形成された円筒状電子写真用機能分離型有機感光体の基体再生方法において、下引き層上の電荷輸送層を溶解可能な溶剤と洗浄用ブラシのセル範囲25mm当たり17〜43個の三次元骨格構造を有し、JIS K−6401によるクッション用軟質ウレタンフォームの物性試験で硬度7〜17.0kgf、引張り強さ1.0〜1.5kg/cm、伸び率200%以上のポリウレタンフォームを使用して回転接触除去洗浄をした後の下引き層を有した円筒状アルミニウム基体を、弾力性を有する研磨ホイールを回転接触させ、下引き層を研磨除去すると同時に、円筒状アルミニウム基体外径表面を粗面化することを特徴とする基体再生方法が記載されている。
【0003】
また、感光体再生時に感光層材料を回収する方法としては、特開平8−297371号公報に、導電性基体上に光導電性物質及びバインダー樹脂を含有する光導電層を有する電子写真感光体を、当該バインダー樹脂を溶解する水溶性溶剤に浸漬して光導電層を溶解除去すること、光導電層を溶解した水溶性溶剤に、水を加えることにより光導電層成分を分離することが記載されている。
【0004】
電子写真感光体は、近年複写機以外にもファクシミリやプリンター等に広く使用されている。その形態としては、シート状、ベルト状、ドラム状等があるが、ドラム状が一般的であり、ドラム状電子写真感光体の場合その基体はアルミニウムあるいはアルミニウム合金製管を使用することが多い。
【0005】
近年、資源再利用の要請が高まっているが、電子写真感光体においても、資源再利用の立場から各種再利用の方法が検討されている。
電子写真感光体の感光層を剥離してその基体を再生する方法については前述の様に多くの検討が行なわれている。しかし、感光層を剥離したときに得られる剥離液から感光層成分あるいは剥離に使用した剥離液成分を分離回収する方法についてはあまり検討されていなかった。
【0006】
特開平8−297371号公報では剥離液(水溶性溶剤)に水を添加し、光導電層成分を分離しているが、この方法では光導電層成分は分離できるものの、剥離液および水の沸点は共に高く、剥離液と水の分離処理が困難な問題がある。例えば、剥離液にN−メチル−2−ピロリドンを使用した場合、その沸点は約160℃であり、添加する水の沸点は100℃なので、これを分離する場合少なくとも100℃以上に加熱する必要がある。従って、この方法では剥離液と水の分離処理が困難である。
【0007】
【発明が解決しようとする課題】
本発明の目的は、電子写真感光体の感光層を剥離したときに生じる剥離液から、感光層成分及び剥離液成分を効率良く回収し、再利用する方法を提供することにある。
【0008】
【課題を解決するための手段】
本発明者は、上記の従来技術に鑑み、誠意検討を行ない、電子写真感光体の感光層を剥離したときに生じる剥離液から、感光層成分及び剥離液成分を効率良く回収し、再利用する方法を見出した。
【0009】
すなわち、上記課題は、本発明の(1)「ピロリドン系溶媒に溶解、膨潤又は少なくとも侵食される電子写真感光体の塗膜をピロリドン系溶媒で剥離して得た液に、炭素数5以下の脂肪族アルコール系溶媒を添加し、剥離液中の成分の一部を分離させ、該分離した液を蒸留してピロリドン系溶媒を回収し、回収したピロリドン系溶媒を再度電子写真感光体の感光層の剥離に使用するとともに、上記蒸留における蒸留残から電子写真感光体の電荷輸送材料を回収することを特徴とする電子写真感光体の再生方法」、()「剥離して得た液を濾過してから蒸留することを特徴とする前記第()項に記載の電子写真感光体の再生方法」、()「前記第(1)項に記載の方法で得た蒸留残滓から電子写真感光体の感光層に使用される樹脂成分を回収することを特徴とする電子写真感光体の再生方法」により達成される。
【0013】
本発明で使用される剥離液は、少なくともピロリドン化合物を含有することを特徴とする。
ピロリドン化合物としては、2−ピロリドン、3−ピロリドン、N−アルキル−2−ピロリドン(例えば、N−メチル−ピロリドン、N−エチル−2−ピロリドン、N−プロピル−2−ピロリドン)、5−アルキル−2−ピロリドン(例えば5−メチル−2−ピロリドン)、N−ビニル−2−ピロリドン、N−アルキル−3−ピロリドン(例えば、N−メチル−3−ピロリドン、N−エチル−3−ピロリドン、N−プロピル−3−ピロリドン)等を用いることが可能である。特にN−メチル−2−ピロリドンが有効である。上記ピロリドン類は単独でもよく、また2種以上の混合物で用いても良い。
【0014】
また、本発明の剥離液に酸化防止剤を添加すると過酸化物の生成が抑制され、剥離液から電荷輸送剤を回収使用する際に好ましい。酸化防止剤は、剥離液中に、0.01〜5.0重量%、好ましくは0.05〜2.0%、更に好ましくは0.05〜1.5%添加すると良い。酸化防止剤としては下記に例示される様なフェノール酸化防止剤、ホスファイト系酸化防止剤、イオウ系酸化防止剤が挙げられる。
【0015】
フェノール系酸化防止剤としては、2,6−ジ−tert−ブチル−4−メチルフェノール、2,5−ジ−tert−ブチルヒドロキノン、2,6−ジ−tert−ブチル−α−ジメチルアミノ−P−クレゾール等のモノフェノール系化合物、4,4′−ビス(2,6ジ−tert−ブチルフェノール)、2,2′−メチレン−ビス(4−メチル−6−tert−ブチルフェノール)、4,4′−メチレン−ビス(2,6−ジ−tert−ブチルフェノール)、4,4′−ブチリデン−ビス(3−メチル−6−tert−ブチルフェノール)等のビスフェノール系化合物、4,4′−チオビス(3−メチル−6−tert−ブチルフェノール)、2,2′−チオビス(6−tert−ブチル−o−クレゾール)、2,2′−チオビス(4−メチル−6−tert−ブチルフェノール)等のチオビスフェノール系化合物、テトラキス〔メチレン−3−(3,5−ジ−tert−ブチル−4−ヒドロキシフェニル)プロピオネート〕メタン、トリス(2−メチル−4−ヒドロキシ−5−tert−ブチル−フェノール)ブタン等のトリスフェノール系化合物等が挙げられる。
【0016】
ホスファイト系酸化防止剤としては、トリフェニルホスファイト、トリスノニルフェニルホスファイト、トリオクチルホスファイト、トリス(モノ及びジ−ノニルフェニル)ホスファイト等が挙げられる。
【0017】
イオウ系酸化防止剤としては、ジラウリルチオジプロピオネート、ジステアリルチオジプロピオネート等が挙げられる。
【0018】
以下、図面を用いて本発明の電子写真用プロセスカートリッジ及び電子写真装置を説明する。
図1に本発明を実施するのに好適な電子写真用プロセスカートリッジを示す。図1において、(1)は電子写真感光体、(2)は電子写真感光体を回転させる軸、(3)は帯電手段、(4)は画像露光光、(5)は現像手段、(6)は転写手段、(7)は紙等の転写材、(8)は像定着手段、(9)はクリーニング手段、(10)は除電のための前露光光であり、(11)はプロセスカートリジの容器を示す。
図1は構造の例を示したものであり、各手段は図に示した以外の方法でも良い。
例えば、帯電手段(3)はコロトロン、スコロトロン、帯電ロール等の公知の帯電手段が使用可能である。
画像露光光(4)及び前露光光(10)の光源には、蛍光燈、タングステンランプ、ハロゲンランプ、水銀灯、ナトリウム灯、発光ダイオード(LED)、半導体レーザー(LD)、エレクトロルミネッセンス(EL)などの発光手段を使用することができる。また、所定の波長域の光のみを照射するために、シャープカットフィルター、バンドパスフィルター、近赤外カットフィルター、ダイクロックフィルター、干渉フィルター、色温度変換フィルターなどの各種フィルターが使用可能である。
クリーニング手段(9)は、クリーニングブレードだけで行われることもあり、クリーニングブラシ、もしくはブレードと併用されることもある。
図1に示すプロセスカートリッジにおいて、クリーニング手段等がプロセスカートリッジに含まれなくとも良い。また、図1では内蔵していない発光手段や転写手段をプロセスカートリッジに内蔵しても良い。
【0019】
図2は本発明を実施するのに好適な電子写真装置の構造図である。
図2において、(1)は電子写真感光体、(2)は電子写真感光体を回転させる軸、(3)は帯電手段、(4)は画像露光光、(5)は現像手段、(6)は転写手段、(7)は紙等の転写材、(8)は像定着手段、(9)はクリーニング手段、(10)は除電のための前露光光である。
図2は構造の例を示したものであり、各手段は図2に示した以外の方法でも良い。
例えば、帯電手段(3)はコロトロン、スコロトロン、帯電ロール等の公知の帯電手段が使用可能である。
画像露光光(4)及び前露光光(10)の光源には、蛍光燈、タングステンランプ、ハロゲンランプ、水銀灯、ナトリウム灯、発光ダイオード(LED)、半導体レーザー(LD)、エレクトロルミネッセンス(EL)などの発光手段を使用することができる。また、所定の波長域の光のみを照射するために、シャープカットフィルター、バンドパスフィルター、近赤外カットフィルター、ダイクロックフィルター、干渉フィルター、色温度変換フィルターなどの各種フィルターが使用可能である。
クリーニング手段(9)は、クリーニングブレードだけで行われることもあり、クリーニングブラシ、もしくはブレードと併用されることもある。
【0020】
【実施例】
以下、本発明を実施例により、具体的に説明する。
1.感光体の作成
まず、始めに本発明の実施例及び比較例で剥離に使用する電子写真体の製造方法を説明する。
(1)基体の作成
外径30.5mm、内径28.5mm、長さ350mmのアルミニウム製円筒体を旋盤に取り付け、切削加工を行ない、厚さ0.75mm、表面粗さRz=1.5μmの電子写真感光体用基体を得た。
このアルミニウム製基体を界面活性材を含有させた洗浄槽に浸漬し、超音波を照射して洗浄を行なったのち、純水で充分にすすぎ洗浄を行なった。
【0021】
(2)下引き層の形成
次いで、このドラム型基体面に下記の組成からなる樹脂塗料を浸漬法で塗布し、次いで150℃で15分間加熱し、熱硬化させて、基体面に約3μm厚の下引き層を形成させた。
酸化チタン 20重量部
アルキッド樹脂 10重量部
メラミン樹脂 10重量部
メチルエチルケトン 60重量部
【0022】
(3)電荷発生層の形成
次いで、この下引き層上に、電荷発生層を積層形成するために下記の組成からなる樹脂塗料(塗工樹脂液)を調製し、上記基体に同じく浸漬法でこの樹脂塗料を塗布し、100℃で10分間乾燥し、下引き層上に厚さ約0.05μmの電荷発生層を積層形成させた。
ブチラール樹脂(UCC社製、XYHL) 1重量部
ジスアゾ顔料[下記(1)式] 9重量部
シクロヘキサノン 30重量部
テトラヒドロフラン(THF) 30重量部
【0023】
【化1】

Figure 0003963425
【0024】
(4)電荷輸送層の形成
さらに、この電荷発生層上に電荷輸送層を積層形成するために下記の組成からなる樹脂塗料(塗工樹脂液)を調製し、上記基体に同じく浸漬法でこの樹脂塗料を塗布し、塗布後120℃で15分間乾燥し、電荷発生層上に電荷輸送層を積層形成させた。電荷輸送層の厚さは28μmであった。
ポリカーボネート樹脂 10重量部
電荷輸送材料[下記(2)式] 10重量部
ジクロロメタン 80重量部
なお、ポリカーボネート樹脂は帝人社製のパンライトK−1300を使用した。
【0025】
【化2】
Figure 0003963425
【0026】
2.感光層の剥離
上記の様にして作成した電子写真感光体の感光層を、次に示す方法で剥離した。
剥離には図3に示す感光層剥離装置を使用した。図3において、(101)は超音波槽、(102)は超音波発振子、(103)は超音波発振する面を含む面、(104)は超音波発振面の周囲の溝、(105)は超音波発振電源部、(106)は剥離を行なう電子写真感光体、(107)は電子写真感光体の保持治具を示す。
図3に示す感光層剥離装置を使用し、表1に示す条件で電子写真感光体の感光層を2本づつ合計100本剥離した。
【0027】
【表1】
Figure 0003963425
【0028】
3.剥離液の分離処理
上記で電子写真感光体を100本剥離処理した剥離液28リットルを剥離装置から抜き出し加熱して8リットルまで濃縮後、約22℃まで冷却した。このようにして電子写真感光層を含んだ剥離液を作成した。
ここで、剥離液の濃縮の程度は必要に応じて変化させれば良く、本実施例に示す約29%に限定される必要はない。濃縮の目安のとしては固形分濃度が5%以上、30%以下になるように濃縮するのが良く、好ましくは7%以上、20%以下になるように濃縮するのが良い。
【0029】
[実施例1]
濃縮した剥離液1リットルにメチルアルコール200ccを添加し、12時間静置したところ黄白色に白濁した。この液を濾紙で濾過し、濾液と濾残に分けた。
このようにして得た濾液を蒸留して、初めにメチルアルコール、次にNMPを分離した。また、濾残と蒸留後の釜残を一緒にし、これをメタノールで良く洗浄した。この洗液を濾紙で濾過後、減圧下で濃縮し、電荷輸送材料を得た。
【0030】
[実施例2]
濃縮した剥離液1リットルにエチルアルコール200ccを添加し、12時間静置したところ黄白色に白濁した。この液を濾紙で濾過し、濾液と濾残に分けた。
このようにして得た濾液を蒸留して始めにエチルアルコール、次にNMPを分離した。また、濾残と蒸留後の釜残を一緒にし、これをメタノールで良く洗浄した。この洗液を濾紙で濾過後、減圧下で濃縮し、電荷輸送材料を得た。
【0031】
[実施例3]
濃縮した剥離液1リットルにイソプロピルアルコール200ccを添加し、12時間静置したところ黄白色に白濁した。この液を濾紙で濾過し、濾液と濾残に分けた。
このようにして得た濾液を蒸留して始めにイソプロピルアルコール、次にNMPを分離した。また、濾残と蒸留後の釜残を一緒にし、これをメタノールで良く洗浄した。この洗液を濾紙で濾過後、減圧下で濃縮し、電荷輸送材料を得た。
【0032】
[比較例1]
濃縮した剥離液1リットルにノルマルヘキサン200ccを添加したが、液に分離が生じるものの、固形分の析出はなかった。液は2層に分離したが、上層はノルマルヘキサンであり、電子写真感光層の成分をほとんど含まず、従って、この方法では電子写真感光層の成分を分離できなかった。
【0033】
[比較例2]
濃縮した剥離液1リットルにテトラヒドロフラン200ccを添加したが、液には分離は生じなかった。従って、この方法では電子写真感光層の成分を分離できなかった。
【0034】
[比較例3]
濃縮した剥離液1リットルに酢酸エチル200ccを添加したが、液には分離は生じなかった。従って、この方法では電子写真感光層の成分を分離できなかった。
【0035】
[比較例4]
濃縮した剥離液1リットルにヘキシルアルコール(1−ヘキサノール)200ccを添加したが、液には分離は生じなかった。従って、この方法では電子写真感光層の成分を分離できなかった。
【0036】
上記の結果から、請求項1、2を満足する実施例1、2、3は剥離液に含まれる成分の分離を行なうことができたが、満足しない比較例1、2、3、4では剥離液に含まれる成分の分離はできなかった。従って、請求項1、2の効果が確認できた。
【0037】
請求項2において、添加するアルコール系溶媒が、炭素数5以下の脂肪族アルコールであることが好ましいが、より好ましくは炭素数1のメチアルコールかあるいは炭素数2のエチルアルコールがより好ましい。
剥離液にアルコールを添加し、黄白色になった液を濾過して得た濾液を蒸留する方法は各種の方法が使用可能であり、単蒸留あるいは多段蒸留が使用可能である。
【0038】
4.回収したNMPおよびアルコールの再利用
実施例1、2、3で回収したNMP及び各アルコールの純度をガスクロマトグラフィーで分析した。その結果を表2に示す。表2から判る様にNMP及び各アルコールの純度は99.5%以上あることが確認できた。これは、剥離に使用する前のNMP及びアルコールの純度と同一であった。従って、NMPは感光層剥離に使用することが可能であり、また、各アルコールは剥離液に添加してその成分分離に使用できることがわかった。
【0039】
【表2】
Figure 0003963425
【0040】
5.回収した電荷輸送材料を使用した電子写真感光体の作成と画像評価
[実施例4]
実施例1と同様な方法で感光層剥離液を処理し、前記(2)式で示される電荷輸送材料を300g得た。この電荷輸送材料を使用して、先に述べたのと同様な方法で電子写真感光体を作成した。
この電子写真感光体を図1に示す構造を有するリコー製Imagio MF650に取り付けた。そしてA4サイズの文字画像を20枚連続印字後10分停止を繰り返し、1000枚ごとに20枚の画像を評価したが、画像に点欠陥や、ムラ、汚れ等の問題は認められず、本発明の電子写真感光体に品質問題のないことが確認できた。
【0041】
【発明の効果】
以上詳細且つ具体的な説明より明らかなように、本発明により、電子写真感光体の感光層を剥離したときに生じる剥離液から、感光層成分及び剥離液成分を効率良く回収し、再利用する方法を提供することができた。
【図面の簡単な説明】
【図1】本発明を実施するのに好適な電子写真用プロセスカートリッジを示す図である。
【図2】本発明を実施するのに好適な電子写真装置を示す図である。
【図3】実施例で使用した剥離装置を示した図である。
【符号の説明】
1 電子写真感光体
2 軸
3 帯電手段
4 画像露光光
5 現像手段
6 転写手段
7 転写材
8 像定着手段
9 クリーニング手段
10 除電前露光光
11 プロセスカートリジの容器
101 超音波槽
102 超音波発振子
103 超音波発振する面を含む面
104 超音波発振面の周囲の溝
105 電源部
106 電子写真感光体
107 保持治具[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for regenerating an electrophotographic photosensitive member, and more particularly to a method for separating the components from a stripping solution from which a photosensitive layer has been stripped, and is applied to a coating film stripping method.
[0002]
[Prior art]
Regarding the substrate regeneration of electrophotographic photoreceptors, JP 2000-010302 A removes the coating film of the cylindrically separated electrophotographic functional photoreceptor for electrophotography in which the undercoat layer is formed of a thermosetting resin. A centerless cylindrical polishing apparatus that regenerates the workrest, the workrest that supports the workpiece of the centerless cylindrical polishing apparatus is set in rotational contact with a roller, and between the adjusting wheel that gives rotational driving and the roller type workrest Describes a centerless cylindrical polishing apparatus in which a pressing roller for pressing a workpiece is disposed. JP-A-2000-221704 has at least an undercoat layer and a photosensitive layer laminated on a substrate. When the laminate on the photoreceptor is removed from the photoreceptor and the substrate is reused, the laminate is swollen and separated at once with a stripping solution, or After the photosensitive layer of the layer is dissolved and removed, the undercoat layer is swollen and peeled with the release liquid to expose the surface of the base, and then subjected to a rubbing treatment with a member impregnated with the cleaning liquid. JP-A-2000-275867 describes a function generated in the manufacturing and inspection processes of an organic electrophotographic photoreceptor produced by forming an organic functional material film on a conductive substrate. In a method for regenerating a conductive substrate from a defective material film, a defective product, or a used life product, the defective product, the damaged product or the life product is converted into a moisture content x wt% and a bath temperature y ° C. Describes that the organic functional material film is peeled off and dissolved and removed from the conductive substrate by dipping in an N-methylpyrrolidone bath satisfying the relationship represented by the following formula: y> 3x + 25, and JP-A-2000-275868. No. gazette includes a photoconductor A coating film separation water bath in which water at a constant temperature is stored as a coating film separating agent using the photoreceptor (7) in which the coating film cutting device (2) is cut into the coating film 7) and the coating film is cut. Immerse in (8) for a certain period of time, separate the coating film from the conductive substrate, and have a subbing layer that is difficult to elute or dissolve in organic solvents without wrinkles on the surface of the conductive substrate of the photoreceptor (7) JP-A-2000-314965 describes that the coating film is surely removed, and the photosensitive layer and the undercoat layer are swollen by immersing the photoreceptor (4) in the swelling remover of the immersion (1). From the Japanese Patent Application Laid-Open No. 05-181289, an organic photoconductor is disclosed in which a photosensitive layer swollen by a peeling device (2) and one end of a film of an undercoat layer are held and peeled off in a spiral shape. The organic film removing method includes at least a carboxylic acid, a phenol compound, and a ketone compound. A processing solution is used to treat an organic film formed on a substrate, and this method describes that a reusable organic photoreceptor reproducing substrate can be obtained. Japanese Patent Application Laid-Open No. 05-341537 In the publication, in an electrophotographic photosensitive member in which at least an undercoat layer and a photosensitive layer are sequentially laminated on a substrate, only the photosensitive layer of the used electrophotographic photosensitive member is removed by dissolution, cutting or peeling, and the used electronic A method for regenerating an electrophotographic photosensitive member is described in which a photosensitive layer is formed again on the undercoat layer of the photographic photosensitive member. Japanese Patent Application Laid-Open No. 06-043663 contains a polyamide resin on the surface of a substrate. It is described that an electrophotographic photosensitive member provided with a photosensitive layer through an undercoat layer is immersed in water or humidified in a high humidity atmosphere, and then the photosensitive layer is peeled off from the substrate surface together with the undercoat layer. In JP-A-07-271058, after an OPC drum having a photosensitive layer formed on the surface of a stainless steel substrate having a thickness of 0.4 mm or more is used, the photosensitive layer is dissolved and removed. Then, the photosensitive layer is formed again and used as a new OPC drum. In the case where a cured undercoat layer is formed on the surface of the substrate, it is described that only the photosensitive layer on the undercoat layer is dissolved and removed. Japanese Patent Application Laid-Open No. 08-146623 discloses a conductive film after removal of the photosensitive coating film. Including an oxidative decomposition process in which the undercoat film remaining on the conductive substrate is treated with an oxidizing acid, and impregnating the undercoat film after the treatment with the oxidizing acid with an organic solvent. An electroconductive substrate regenerating apparatus from an electrophotographic photosensitive member, and an organic solvent from the apparatus. An apparatus for regenerating a conductive substrate from an electrophotographic photosensitive member excluding an impregnating device is described, and Japanese Patent Application Laid-Open No. 09-146287 discloses a linear beam of a TEA-CO2 laser (6) formed of a photosensitive drum polycarbonate. Conductor (3) And the photosensitive member (4) are removed, and at the same time, the remaining lowermost insulator (2) is removed by a linear beam (7) of an excimer laser, which is described in Japanese Patent Application Laid-Open No. 09-179326. Removes only this photosensitive layer from the OPC drum with a photosensitive layer formed on the surface of a stainless steel pipe substrate with a wall thickness of 0.3 mm or more by jetting collision of particles such as melamine alkyd resin onto this drum And a step of forming a photosensitive layer on the surface of the substrate to obtain an OPC drum. Japanese Patent Application Laid-Open No. 09-212875 describes the surface of a woven fabric. An organic solvent is supplied, and the woven fabric containing the organic solvent is brought into contact with or in pressure contact with all or a part of the peripheral surface of the electrophotographic photosensitive member to form a conductive layer formed on the conductive substrate of the electrophotographic photosensitive member ,under The operation of removing the coating film such as the coating layer and the photosensitive layer and adding an organic solvent to the woven fabric from which the coating film residue has been removed, scraping the coating film residue with a brush, and cleaning the woven fabric. A method for removing a coating film on an electrophotographic photosensitive member, which is repeatedly performed, is described. JP-A-10-177254 discloses an organic photosensitive drum in which an organic photosensitive layer is formed on the surface of a stainless steel drum base. A process of removing an unnecessary organic photosensitive layer from the surface of the pipe substrate by performing a high-temperature heat treatment at 600 ° C. to 1200 ° C., and a process of forming a new organic photosensitive layer on the surface of the drum substrate from which the unnecessary organic photosensitive layer has been removed. Japanese Patent Laid-Open No. 10-213911 discloses a silane coupling layer (2), a charge generation layer (3), and a charge transfer layer (4) on an aluminum base (1). Outside the substrate consisting of A removal liquid for removing the base layer outer layer part (5) from the OPC drum to which the layer part (5) is adhered in one step is provided. JP-A-11-024288 describes that a dielectric constant is 20 or more from a used OPC drum having a photosensitive layer on a conductive substrate. This is a method for reproducing an OPC drum in which a photosensitive layer is removed using a solvent containing an aprotic polar solvent having a dipole moment of 3 or more, then washed with purified water, and then a new photosensitive layer is formed again. As the aprotic polar solvent, dimethyl sulfoxide is preferably used, and as the solvent containing the aprotic polar solvent, a mixture of dimethyl sulfoxide and an inorganic acid is used. Further, it is described that the solvent used for removing the photosensitive layer is preferably distilled and reused. JP-A-11-295908 discloses that the undercoat layer is formed of a thermosetting resin. In a method for regenerating a substrate of a functional separation type organic photoreceptor for cylindrical electrophotography, 17 to 43 three-dimensional skeleton structures per 25 mm cell range of a solvent and a cleaning brush capable of dissolving the charge transport layer on the undercoat layer In a physical property test of a soft urethane foam for cushion according to JIS K-6401, a polyurethane foam having a hardness of 7 to 17.0 kgf, a tensile strength of 1.0 to 1.5 kg / cm 2 and an elongation of 200% or more is used. The cylindrical aluminum substrate having the subbing layer after cleaning by rotating contact removal is brought into contact with a polishing wheel having elasticity to rotate and remove the subbing layer at the same time. Substrate reproducing method characterized by roughening the cylindrical aluminum substrate outside diameter surface is described.
[0003]
In addition, as a method for recovering the photosensitive layer material during the reproduction of the photosensitive member, JP-A-8-297371 discloses an electrophotographic photosensitive member having a photoconductive layer containing a photoconductive substance and a binder resin on a conductive substrate. It is described that the photoconductive layer is dissolved and removed by immersing it in a water-soluble solvent that dissolves the binder resin, and that the photoconductive layer components are separated by adding water to the water-soluble solvent in which the photoconductive layer is dissolved. ing.
[0004]
In recent years, electrophotographic photosensitive members have been widely used for facsimiles, printers and the like in addition to copying machines. The form includes a sheet form, a belt form, a drum form, and the like, but a drum form is common, and in the case of a drum-shaped electrophotographic photosensitive member, an aluminum or aluminum alloy tube is often used for the substrate.
[0005]
In recent years, the demand for resource reuse has increased, and various methods of reuse have also been studied from the standpoint of resource reuse in electrophotographic photoreceptors.
As described above, many studies have been made on the method of peeling off the photosensitive layer of the electrophotographic photosensitive member and regenerating the substrate. However, a method for separating and recovering the photosensitive layer component or the stripping solution component used for stripping from the stripping solution obtained when the photosensitive layer is stripped has not been studied much.
[0006]
In JP-A-8-297371, water is added to the stripping solution (water-soluble solvent) to separate the photoconductive layer components. In this method, the photoconductive layer components can be separated, but the boiling point of the stripping solution and water. Both are high, and there is a problem that it is difficult to separate the stripper and water. For example, when N-methyl-2-pyrrolidone is used as the stripping solution, the boiling point is about 160 ° C., and the boiling point of water to be added is 100 ° C. Therefore, when separating this, it is necessary to heat to at least 100 ° C. or higher. is there. Therefore, it is difficult to separate the stripper and water by this method.
[0007]
[Problems to be solved by the invention]
An object of the present invention is to provide a method for efficiently recovering and reusing a photosensitive layer component and a stripping solution component from a stripping solution produced when a photosensitive layer of an electrophotographic photosensitive member is stripped.
[0008]
[Means for Solving the Problems]
In view of the above-described conventional technology, the present inventor has conducted sincerity studies, and efficiently recovers and reuses the photosensitive layer component and the stripping solution component from the stripping solution generated when the photosensitive layer of the electrophotographic photosensitive member is stripped. I found a way.
[0009]
That is, the above-mentioned problem is (1) “a solution having 5 or less carbon atoms in a solution obtained by peeling a coating film of an electrophotographic photosensitive member dissolved, swollen or at least eroded in a pyrrolidone solvent with a pyrrolidone solvent. An aliphatic alcohol solvent is added, a part of the components in the stripping solution is separated, the separated solution is distilled to recover the pyrrolidone solvent, and the recovered pyrrolidone solvent is again used as the photosensitive layer of the electrophotographic photoreceptor. And a method for regenerating an electrophotographic photosensitive member characterized by recovering the charge transport material of the electrophotographic photosensitive member from the distillation residue in the distillation, ”( 2 )“ filtering the liquid obtained by peeling. wherein the (1) method of reproducing electrophotographic photosensitive member according to claim ', (3) "the first (1) electrons from distillation residues obtained by the method according to claim, characterized in that distillation after Resin composition used for the photosensitive layer of photographic photoreceptors It is achieved by an electrophotographic photoreceptor of the reproduction method ", which comprises recovering.
[0013]
The stripping solution used in the present invention is characterized by containing at least a pyrrolidone compound.
Examples of pyrrolidone compounds include 2-pyrrolidone, 3-pyrrolidone, N-alkyl-2-pyrrolidone (for example, N-methyl-pyrrolidone, N-ethyl-2-pyrrolidone, N-propyl-2-pyrrolidone), 5-alkyl- 2-pyrrolidone (for example, 5-methyl-2-pyrrolidone), N-vinyl-2-pyrrolidone, N-alkyl-3-pyrrolidone (for example, N-methyl-3-pyrrolidone, N-ethyl-3-pyrrolidone, N- Propyl-3-pyrrolidone) and the like. In particular, N-methyl-2-pyrrolidone is effective. The pyrrolidones may be used alone or in a mixture of two or more.
[0014]
Moreover, when an antioxidant is added to the stripping solution of the present invention, the formation of peroxide is suppressed, which is preferable when the charge transport agent is recovered and used from the stripping solution. The antioxidant may be added to the stripping solution in an amount of 0.01 to 5.0% by weight, preferably 0.05 to 2.0%, more preferably 0.05 to 1.5%. Examples of the antioxidant include phenol antioxidants, phosphite antioxidants, and sulfur antioxidants as exemplified below.
[0015]
Examples of phenolic antioxidants include 2,6-di-tert-butyl-4-methylphenol, 2,5-di-tert-butylhydroquinone, 2,6-di-tert-butyl-α-dimethylamino-P. -Monophenol compounds such as cresol, 4,4'-bis (2,6di-tert-butylphenol), 2,2'-methylene-bis (4-methyl-6-tert-butylphenol), 4,4 ' -Bisphenol compounds such as methylene-bis (2,6-di-tert-butylphenol), 4,4'-butylidene-bis (3-methyl-6-tert-butylphenol), 4,4'-thiobis (3- Methyl-6-tert-butylphenol), 2,2'-thiobis (6-tert-butyl-o-cresol), 2,2'-thiobis (4-me Thiobisphenol compounds such as ru-6-tert-butylphenol), tetrakis [methylene-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate] methane, tris (2-methyl-4-hydroxy) And trisphenol compounds such as -5-tert-butyl-phenol) butane.
[0016]
Examples of the phosphite antioxidant include triphenyl phosphite, trisnonylphenyl phosphite, trioctyl phosphite, tris (mono and di-nonylphenyl) phosphite and the like.
[0017]
Examples of the sulfur antioxidant include dilauryl thiodipropionate and distearyl thiodipropionate.
[0018]
Hereinafter, an electrophotographic process cartridge and an electrophotographic apparatus of the present invention will be described with reference to the drawings.
FIG. 1 shows an electrophotographic process cartridge suitable for carrying out the present invention. In FIG. 1, (1) is an electrophotographic photosensitive member, (2) is a shaft for rotating the electrophotographic photosensitive member, (3) is charging means, (4) is image exposure light, (5) is developing means, (6 ) Is a transfer means, (7) is a transfer material such as paper, (8) is an image fixing means, (9) is a cleaning means, (10) is pre-exposure light for static elimination, and (11) is a process cartridge. The container is shown.
FIG. 1 shows an example of the structure, and each means may be a method other than that shown in the figure.
For example, the charging means (3) can be a known charging means such as a corotron, a scorotron, or a charging roll.
Examples of light sources for image exposure light (4) and pre-exposure light (10) include fluorescent lamps, tungsten lamps, halogen lamps, mercury lamps, sodium lamps, light emitting diodes (LEDs), semiconductor lasers (LD), electroluminescence (EL), etc. The light emitting means can be used. In addition, various types of filters such as a sharp cut filter, a band pass filter, a near infrared cut filter, a dichroic filter, an interference filter, and a color temperature conversion filter can be used to irradiate only light in a predetermined wavelength range.
The cleaning means (9) may be performed only with a cleaning blade, or may be used in combination with a cleaning brush or a blade.
In the process cartridge shown in FIG. 1, the cleaning means and the like may not be included in the process cartridge. Further, the light emitting means and the transfer means which are not built in FIG. 1 may be built in the process cartridge.
[0019]
FIG. 2 is a structural diagram of an electrophotographic apparatus suitable for carrying out the present invention.
In FIG. 2, (1) is an electrophotographic photosensitive member, (2) is a shaft for rotating the electrophotographic photosensitive member, (3) is charging means, (4) is image exposure light, (5) is developing means, (6 ) Is a transfer means, (7) is a transfer material such as paper, (8) is an image fixing means, (9) is a cleaning means, and (10) is pre-exposure light for static elimination.
FIG. 2 shows an example of the structure, and each means may be a method other than that shown in FIG.
For example, the charging means (3) can be a known charging means such as a corotron, a scorotron, or a charging roll.
Examples of light sources for image exposure light (4) and pre-exposure light (10) include fluorescent lamps, tungsten lamps, halogen lamps, mercury lamps, sodium lamps, light emitting diodes (LEDs), semiconductor lasers (LD), electroluminescence (EL), etc. The light emitting means can be used. In addition, various types of filters such as a sharp cut filter, a band pass filter, a near infrared cut filter, a dichroic filter, an interference filter, and a color temperature conversion filter can be used to irradiate only light in a predetermined wavelength range.
The cleaning means (9) may be performed only with a cleaning blade, or may be used in combination with a cleaning brush or a blade.
[0020]
【Example】
Hereinafter, the present invention will be specifically described by way of examples.
1. First, a method for producing an electrophotographic body used for peeling in Examples and Comparative Examples of the present invention will be described.
(1) Preparation of the base body An aluminum cylindrical body having an outer diameter of 30.5 mm, an inner diameter of 28.5 mm, and a length of 350 mm is attached to a lathe and cut, and the thickness is 0.75 mm and the surface roughness is Rz = 1.5 μm. An electrophotographic photoreceptor substrate was obtained.
This aluminum substrate was immersed in a cleaning tank containing a surfactant, washed by irradiating ultrasonic waves, and then sufficiently rinsed with pure water.
[0021]
(2) Formation of the undercoat layer Next, a resin paint having the following composition was applied to the drum-type substrate surface by a dipping method, then heated at 150 ° C. for 15 minutes and thermally cured to have a thickness of about 3 μm on the substrate surface. A subbing layer was formed.
Titanium oxide 20 parts by weight Alkyd resin 10 parts by weight Melamine resin 10 parts by weight Methyl ethyl ketone 60 parts by weight
(3) Formation of charge generation layer Next, a resin paint (coating resin solution) having the following composition is prepared on the undercoat layer in order to form a charge generation layer, and the substrate is similarly immersed in the substrate. This resin paint was applied and dried at 100 ° C. for 10 minutes to form a charge generation layer having a thickness of about 0.05 μm on the undercoat layer.
Butyral resin (manufactured by UCC, XYHL) 1 part by weight disazo pigment [formula (1) below] 9 parts by weight cyclohexanone 30 parts by weight tetrahydrofuran (THF) 30 parts by weight
[Chemical 1]
Figure 0003963425
[0024]
(4) Formation of charge transport layer Further, in order to form a charge transport layer on the charge generation layer, a resin paint (coating resin solution) having the following composition was prepared, and this was also immersed in the substrate by the dipping method. A resin paint was applied and dried at 120 ° C. for 15 minutes after application to form a charge transport layer on the charge generation layer. The thickness of the charge transport layer was 28 μm.
10 parts by weight of polycarbonate resin
Charge transport material [Formula (2) below] 10 parts by weight Dichloromethane 80 parts by weight The polycarbonate resin used was Panlite K-1300 manufactured by Teijin Limited.
[0025]
[Chemical 2]
Figure 0003963425
[0026]
2. Peeling of the photosensitive layer The photosensitive layer of the electrophotographic photoreceptor prepared as described above was peeled by the following method.
The photosensitive layer peeling apparatus shown in FIG. 3 was used for peeling. In FIG. 3, (101) is an ultrasonic bath, (102) is an ultrasonic oscillator, (103) is a surface including an ultrasonic oscillation surface, (104) is a groove around the ultrasonic oscillation surface, (105) Is an ultrasonic oscillation power source, (106) is an electrophotographic photosensitive member to be peeled, and (107) is a holding jig for the electrophotographic photosensitive member.
Using the photosensitive layer peeling apparatus shown in FIG. 3, a total of 100 photosensitive layers of the electrophotographic photosensitive member were peeled from each other under the conditions shown in Table 1.
[0027]
[Table 1]
Figure 0003963425
[0028]
3. Separation treatment of stripping solution 28 liters of stripping solution obtained by stripping 100 electrophotographic photoreceptors as described above was extracted from the stripping apparatus, heated, concentrated to 8 liters, and then cooled to about 22 ° C. In this way, a stripping solution containing an electrophotographic photosensitive layer was prepared.
Here, the degree of concentration of the stripping solution may be changed as necessary, and need not be limited to about 29% shown in this embodiment. As a standard for concentration, it is preferable to concentrate so that the solid content concentration is 5% or more and 30% or less, and preferably 7% or more and 20% or less.
[0029]
[Example 1]
When 200 cc of methyl alcohol was added to 1 liter of the concentrated stripping solution and allowed to stand for 12 hours, it became cloudy yellowish white. This liquid was filtered with a filter paper and separated into a filtrate and a residue.
The filtrate thus obtained was distilled to first separate methyl alcohol and then NMP. Further, the filter residue and the residue after distillation were combined and washed thoroughly with methanol. The washing solution was filtered through a filter paper and then concentrated under reduced pressure to obtain a charge transport material.
[0030]
[Example 2]
When 200 cc of ethyl alcohol was added to 1 liter of the concentrated stripping solution and allowed to stand for 12 hours, it became cloudy yellowish white. This liquid was filtered with a filter paper and separated into a filtrate and a residue.
The filtrate thus obtained was distilled to first separate ethyl alcohol and then NMP. Further, the filter residue and the residue after distillation were combined and washed thoroughly with methanol. The washing solution was filtered through a filter paper and then concentrated under reduced pressure to obtain a charge transport material.
[0031]
[Example 3]
When 200 cc of isopropyl alcohol was added to 1 liter of the concentrated stripping solution and allowed to stand for 12 hours, it became cloudy yellowish white. This liquid was filtered with a filter paper and separated into a filtrate and a residue.
The filtrate thus obtained was distilled to first separate isopropyl alcohol and then NMP. Further, the filter residue and the residue after distillation were combined and washed thoroughly with methanol. The washing solution was filtered through a filter paper and then concentrated under reduced pressure to obtain a charge transport material.
[0032]
[Comparative Example 1]
Although 200 cc of normal hexane was added to 1 liter of the concentrated stripping solution, separation occurred in the solution, but no solid content was deposited. Although the liquid was separated into two layers, the upper layer was normal hexane and contained almost no components of the electrophotographic photosensitive layer. Therefore, the components of the electrophotographic photosensitive layer could not be separated by this method.
[0033]
[Comparative Example 2]
Although 200 cc of tetrahydrofuran was added to 1 liter of the concentrated stripping solution, no separation occurred in the solution. Therefore, this method cannot separate the components of the electrophotographic photosensitive layer.
[0034]
[Comparative Example 3]
200 cc of ethyl acetate was added to 1 liter of concentrated stripping solution, but no separation occurred in the solution. Therefore, this method cannot separate the components of the electrophotographic photosensitive layer.
[0035]
[Comparative Example 4]
Although 200 cc of hexyl alcohol (1-hexanol) was added to 1 liter of concentrated stripping solution, no separation occurred in the solution. Therefore, this method cannot separate the components of the electrophotographic photosensitive layer.
[0036]
From the above results, Examples 1, 2, and 3 satisfying claims 1 and 2 were able to separate components contained in the stripping solution, but in Comparative Examples 1, 2, 3, and 4 that were not satisfied, stripping was performed. The components contained in the liquid could not be separated. Therefore, the effects of claims 1 and 2 were confirmed.
[0037]
In Claim 2, the alcohol solvent to be added is preferably an aliphatic alcohol having 5 or less carbon atoms, more preferably methyl alcohol having 1 carbon atom or ethyl alcohol having 2 carbon atoms.
Various methods can be used for the method of distilling the filtrate obtained by adding alcohol to the stripping solution and filtering the yellowish white solution, and simple distillation or multistage distillation can be used.
[0038]
4). Reuse of recovered NMP and alcohol The purity of NMP and each alcohol recovered in Examples 1, 2, and 3 was analyzed by gas chromatography. The results are shown in Table 2. As can be seen from Table 2, it was confirmed that the purity of NMP and each alcohol was 99.5% or more. This was identical to the purity of NMP and alcohol prior to use for stripping. Therefore, it was found that NMP can be used for stripping the photosensitive layer, and that each alcohol can be added to the stripper and used for component separation.
[0039]
[Table 2]
Figure 0003963425
[0040]
5). Preparation and image evaluation of electrophotographic photoreceptor using collected charge transport material [Example 4]
The photosensitive layer stripping solution was processed in the same manner as in Example 1 to obtain 300 g of the charge transport material represented by the formula (2). Using this charge transport material , an electrophotographic photosensitive member was prepared in the same manner as described above.
This electrophotographic photoreceptor was attached to Ricoh's Imagio MF650 having the structure shown in FIG. Then, the printing was continuously stopped for 10 minutes after 20 A4 size character images were continuously printed, and 20 images were evaluated for every 1000 sheets. However, no problems such as point defects, unevenness, and stains were observed in the images. It was confirmed that there was no quality problem in the electrophotographic photoreceptor.
[0041]
【The invention's effect】
As is clear from the above detailed and specific description, according to the present invention, the photosensitive layer component and the stripping solution component are efficiently recovered and reused from the stripping solution generated when the photosensitive layer of the electrophotographic photosensitive member is stripped. Could provide a way.
[Brief description of the drawings]
FIG. 1 is a diagram showing an electrophotographic process cartridge suitable for carrying out the present invention.
FIG. 2 is a diagram showing an electrophotographic apparatus suitable for carrying out the present invention.
FIG. 3 is a view showing a peeling apparatus used in Examples.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Electrophotographic photoreceptor 2 Axis 3 Charging means 4 Image exposure light 5 Developing means 6 Transfer means 7 Transfer material 8 Image fixing means 9 Cleaning means 10 Exposure light before static elimination 11 Process cartridge container 101 Ultrasonic tank 102 Ultrasonic oscillator 103 Surface including surface for ultrasonic wave oscillation 104 Groove around ultrasonic wave oscillation surface 105 Power supply unit 106 Electrophotographic photosensitive member 107 Holding jig

Claims (3)

ピロリドン系溶媒に溶解、膨潤又は少なくとも侵食される電子写真感光体の塗膜をピロリドン系溶媒で剥離して得た液に、炭素数5以下の脂肪族アルコール系溶媒を添加し、剥離液中の成分の一部を分離させ、該分離した液を蒸留してピロリドン系溶媒を回収し、回収したピロリドン系溶媒を再度電子写真感光体の感光層の剥離に使用するとともに、上記蒸留における蒸留残から電子写真感光体の電荷輸送材料を回収することを特徴とする電子写真感光体の再生方法。An aliphatic alcohol solvent having 5 or less carbon atoms is added to a solution obtained by peeling a coating film of an electrophotographic photoreceptor dissolved, swollen or at least eroded in a pyrrolidone solvent with a pyrrolidone solvent, A part of the components are separated, and the separated liquid is distilled to recover the pyrrolidone-based solvent. The recovered pyrrolidone-based solvent is used again for peeling the photosensitive layer of the electrophotographic photoreceptor, and from the distillation residue in the distillation. A method for regenerating an electrophotographic photoreceptor, comprising collecting the charge transport material of the electrophotographic photoreceptor. 剥離して得た液を濾過してから蒸留することを特徴とする請求項に記載の電子写真感光体の再生方法。2. The method for regenerating an electrophotographic photosensitive member according to claim 1 , wherein the liquid obtained by peeling is filtered and then distilled. 請求項1に記載の方法で得た蒸留残滓から電子写真感光体の感光層に使用される樹脂成分を回収することを特徴とする電子写真感光体の再生方法。The method of reproducing an electrophotographic photosensitive member, and recovering the resin component used from distillation residues obtained by the method in the photosensitive layer of the electrophotographic photosensitive member according to claim 1.
JP2001317553A 2001-10-16 2001-10-16 Reproduction method of electrophotographic photosensitive member Expired - Fee Related JP3963425B2 (en)

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