JP3617140B2 - Organic photoreceptor for liquid development and method for producing the same - Google Patents
Organic photoreceptor for liquid development and method for producing the same Download PDFInfo
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- JP3617140B2 JP3617140B2 JP24891195A JP24891195A JP3617140B2 JP 3617140 B2 JP3617140 B2 JP 3617140B2 JP 24891195 A JP24891195 A JP 24891195A JP 24891195 A JP24891195 A JP 24891195A JP 3617140 B2 JP3617140 B2 JP 3617140B2
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Description
【０００１】
【発明の属する技術分野】
この発明は液体現像方式の電子写真用感光体に係り、特に耐溶剤性に優れる有機感光体に関する。
【０００２】
【従来の技術】
電子写真プロセスにおいて感光体上の静電潜像を可視化する現像方式には粉体のトナーを用いる乾式現像法が主流となっている。近年画像品質の向上を狙いとしてトナー粒子径が比較的小さく画像度が高いこと、階調再現性に優れていること、画像定着が容易なこと等から絶縁性の液体（灯油系）中にトナーを分散させた現像液を用いる液体現像方式が使われるようになった。感光体としてはこの現像液の中で使用されることになり耐溶剤性が要求される。液体現像用有機感光体は円筒状アルミ基板表面に下引き層（ＵＣＬ）、電荷発生層（ＣＧＬ）、電荷輸送層（ＣＴＬ）をこの順に塗布した感光層を形成している。従って感光体の現像液と絶えず触れている最外層のＣＴＬには耐溶剤性の材料が使用されている。また感光体の端部には、感光体の周囲に設けられた現像器、クリーニング機構等と感光体との位置合わせの際に、それらが感光層と接触しないようにあらかじめ感光層を剥がしてアルミの地肌を露出させ非感光層部が形成されている。
【０００３】
図３は従来の液体現像用有機感光体の要部を示す断面図である。導電性基体１上に下引き層２、電荷発生層３、電荷輸送層４が積層され、端部は非感光層部５となっている。
【０００４】
【発明が解決しようとする課題】
しかしながら、前述のような従来の感光体にあってはＵＣＬ、ＣＧＬ、ＣＴＬの三層を積層形成した後、端部の感光層をまとめて切除することにより非感光層部を形成しているためＵＣＬ、ＣＧＬの切端面がむきだしとなり現像液が浸食してきてしばしば剥がれが発生して感光体としての機能が消失するという問題があった。液体現像用有機感光体としてはこの切断面からの感光層の剥がれを防止して耐溶剤性を向上させることが必要である。
【０００５】
この発明は上述の点に鑑みてなされその目的は感光層端面からの溶剤の浸食を防止して信頼性に優れる液体現像用有機感光体を提供することにある。
【０００６】
【課題を解決するための手段】
上述の目的はこの発明によれば導電性基体上に下引き層、電荷発生層、電荷輸送層を順次積層した感光層を有し、絶縁性の液体中にトナーを分散させた現像液を用いて現像を行う液体現像用有機感光体において、該液体現像用有機感光体は、感光層端部を切除して非感光層部を設けたものであり、感光層端部の切除は、電荷輸送層の塗布前に、電荷発生層の切除を溶剤で行い、電荷輸送層の塗布後に、電荷輸送層および下引き層を機械的に切除したものであり、電荷輸送層は電荷発生層を露出しないように被覆するものであるとすることにより達成される。
【０００７】
上述の発明において電荷輸送層は電荷発生層に加えて下引き層も被覆するものであるとすることが有効である。すなわち、感光層端部の切除は、電荷輸送層の塗布前に、電荷発生層および下引き層の切除を溶剤で行い、電荷輸送層の塗布後に、電荷輸送層を機械的に切除したものであり、電荷輸送層は電荷発生層および下引き層を露出しないように被覆するものであるとすることが有効である。
電荷発生層のみを被覆する構造の感光体は、下引き層と導電性基体の密着性が高くないので、剥離により非感光層部を形成し易く感光体の製造が容易な利点がある。一方、耐溶剤性の電荷輸送層で下引き層と電荷発生層を共に被覆すると、溶剤の浸食の防止能力がより高い。
【０００８】
【発明の実施の形態】
電荷輸送層は耐溶剤性の有機バインダを用いて形成する。下引き層、電荷発生層、電荷輸送層を積層した感光層は、その端部を切除して非感光層部にする。この発明では感光層端部の切除の工程は電荷輸送層の塗布の前後に分けて行う。塗布前の感光層端部の切除は電荷発生層または下引層を含めて、溶剤で行ない、塗布後は機械的に行なう。
【０００９】
【実施例】
実施例１
図１はこの発明の実施例に係る感光体の製造工程を示す要部断面図である。液体現像用有機感光体の下引き層（ＵＣＬ）をナイロン系樹脂、電荷発生層（ＣＧＬ）をフタロシアニン顔料と塩ビ系バインダ、電荷輸送層（ＣＴＬ）を電荷輸送層物質と耐溶剤性に優れたドデカン二酸ポリマ−ウィズ２，６−ジメトキシ−９，１０−アントラセンジオールまたはドデカンジオールジクロリドポリマ−ウィズ２，６−ジメトキシ−９，１０−アントラセンジオールのバインダで構成し、円筒状アルミ基板にＵＣＬ、ＣＧＬ、ＣＴＬの順に塗布した。図の順に説明すると、アルミ基板上に前記ＵＣＬとＣＧＬを塗布（図１−ａ）、非感光層部の長さＡに２ｍｍを加えたＡ＋２ｍｍの寸法で布に溶剤ＤＣＭをつけてＣＧＬを拭き取り、その後ＣＴＬを塗布する（図１−ｂ）。長さＡｍｍの寸法でカッタによりすじを入れてＣＴＬとＵＣＬを機械的に切除した（図１−ｃ）。ＵＣＬと導電性基体１の接着強度は高くないのでこの機械的な切除は容易である。
実施例２
図２はこの発明の異なる実施例に係る感光体の製造工程を示す要部断面図である。液体現像用有機感光体の下引き層（ＵＣＬ）をナイロン系樹脂、電荷発生層（ＣＧＬ）をフタロシアニン顔料と塩ビ系バインダ、電荷輸送層（ＣＴＬ）を電荷輸送層物質と耐溶剤性に優れたドデカン二酸ポリマ−ウィズ２，６−ジメトキシ９，１０−アントラセンジオールまたはドデカンジオールジクロリドポリマ−ウィズ２，６−ジメトキシ−９，１０−アントラセンジオールのバインダで構成し、円筒状アルミ基板にＵＣＬ、ＣＧＬ、ＣＴＬの順に塗布した。図の順に説明すると、アルミ基板上に前記ＵＣＬとＣＧＬを塗布する（図２−ａ）。非感光層部の長さＡ＋２ｍｍの寸法で布に溶剤ＤＣＭをつけてＵＣＬとＣＧＬを拭き取り、その後ＣＴＬを塗布する（図２−ｂ）。長さＡｍｍの寸法でカッタによりすじを入れてＣＴＬを機械的に切除した（図２−ｃ）。このようにすることにより下引き層と電荷発生層が共に電荷輸送層に被覆され、感光層の剥離が防止される。
【００１０】
【発明の効果】
この発明によれば、感光層端部の切除を、電荷輸送層塗布前の電荷発生層の溶剤による切除と電荷輸送層塗布後の電荷輸送層および下引き層の機械的切除とにより行う、又は、電荷輸送層塗布前の電荷発生層および下引き層の溶剤による切除と電荷輸送層塗布後の電荷輸送層の機械的切除とにより行い、下引き層と電荷発生層の両者又は電荷発生層を耐溶剤性のある電荷輸送層で被覆するので、溶剤による感光層の浸食剥離が防止され、耐刷性が向上した。従来の感光体は１〜２万枚の耐刷性であったが本発明の感光体は１０万枚の耐刷性を有している。
【図面の簡単な説明】
【図１】この発明の実施例に係る感光体の製造工程を示す要部断面図
【図２】この発明の異なる実施例に係る感光体の製造工程を示す要部断面図
【図３】従来の有機感光体を示す要部断面図
【符号の説明】
１ 導電性基体
２ 下引き層
３ 電荷発生層
４ 電荷輸送層
５ 非感光層部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid developing type electrophotographic photoreceptor, and more particularly, to an organic photoreceptor excellent in solvent resistance.
[0002]
[Prior art]
In the electrophotographic process, a dry development method using powder toner is mainly used as a development method for visualizing an electrostatic latent image on a photoreceptor. With the aim of improving image quality in recent years, toner particles in insulating liquids (kerosene system) have a relatively small toner particle size, high image quality, excellent gradation reproducibility, and easy image fixing. The liquid development method using a developer in which is dispersed is now used. The photoreceptor is used in this developer and requires solvent resistance. The organic photoreceptor for liquid development forms a photosensitive layer in which an undercoat layer (UCL), a charge generation layer (CGL), and a charge transport layer (CTL) are applied in this order on the surface of a cylindrical aluminum substrate. Therefore, a solvent-resistant material is used for the outermost CTL that is constantly in contact with the developer of the photoreceptor. In addition, at the end of the photosensitive member, the photosensitive layer is peeled off in advance so that the developer, cleaning mechanism, etc. provided around the photosensitive member and the photosensitive member are not in contact with the photosensitive layer. The non-photosensitive layer portion is formed by exposing the surface of the substrate.
[0003]
FIG. 3 is a cross-sectional view showing the main part of a conventional organic photoreceptor for liquid development. An
[0004]
[Problems to be solved by the invention]
However, in the conventional photoreceptor as described above, the non-photosensitive layer portion is formed by laminating the three layers of UCL, CGL, and CTL, and then cutting the photosensitive layer at the end together. There is a problem that the cut end surfaces of UCL and CGL are exposed, and the developer is eroded, often peeling off and the function as a photoreceptor disappears. It is necessary for the organic photoreceptor for liquid development to improve the solvent resistance by preventing the peeling of the photosensitive layer from the cut surface.
[0005]
The present invention has been made in view of the above points, and an object thereof is to provide an organic photoreceptor for liquid development which is excellent in reliability by preventing erosion of a solvent from the end face of the photosensitive layer.
[0006]
[Means for Solving the Problems]
According to the present invention, the above-described object is to use a developer having a photosensitive layer in which an undercoat layer, a charge generation layer, and a charge transport layer are sequentially laminated on a conductive substrate and in which toner is dispersed in an insulating liquid. In the liquid developing organic photoreceptor for development, the liquid developing organic photoreceptor is formed by cutting off the end of the photosensitive layer to provide a non-photosensitive layer. The charge generation layer is removed with a solvent before application of the layer, and the charge transport layer and the undercoat layer are mechanically removed after application of the charge transfer layer, and the charge generation layer does not expose the charge generation layer. This is achieved by assuming that the coating is performed.
[0007]
In the above-described invention, it is effective that the charge transport layer covers the undercoat layer in addition to the charge generation layer. That is, the edge of the photosensitive layer is removed by removing the charge generation layer and the undercoat layer with a solvent before coating the charge transport layer, and mechanically cutting the charge transport layer after coating the charge transport layer. In other words, it is effective that the charge transport layer covers the charge generation layer and the undercoat layer so as not to be exposed.
A photoreceptor having a structure that covers only the charge generation layer has an advantage that the non-photosensitive layer portion is easily formed by peeling since the adhesion between the undercoat layer and the conductive substrate is not high. On the other hand, when both the undercoat layer and the charge generation layer are coated with a solvent-resistant charge transport layer, the ability to prevent solvent erosion is higher.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The charge transport layer is formed using a solvent-resistant organic binder. The photosensitive layer on which the undercoat layer, the charge generation layer, and the charge transport layer are laminated is cut off to form a non-photosensitive layer portion. In the present invention, the process of removing the edge of the photosensitive layer is performed before and after the application of the charge transport layer. The edge of the photosensitive layer before coating is removed with a solvent, including the charge generation layer or the undercoat layer, and mechanically after coating.
[0009]
【Example】
Example 1
FIG. 1 is a cross-sectional view of an essential part showing a manufacturing process of a photoreceptor according to an embodiment of the present invention. The undercoat layer (UCL) of the organic photoreceptor for liquid development is a nylon resin, the charge generation layer (CGL) is a phthalocyanine pigment and a vinyl chloride binder, the charge transport layer (CTL) is a charge transport layer material and has excellent solvent resistance. It is composed of a binder of dodecanedioic acid polymer-with 2,6-dimethoxy-9,10-anthracenediol or dodecanediol dichloride polymer-with 2,6-dimethoxy-9,10-anthracenediol, UCL on a cylindrical aluminum substrate, It applied in order of CGL and CTL. Explaining in the order shown in the figure, the UCL and CGL are applied on the aluminum substrate (FIG. 1-a), and the solvent DCM is applied to the cloth in a size of A + 2 mm obtained by adding 2 mm to the length A of the non-photosensitive layer, and the CGL is wiped off. Then, CTL is applied (FIG. 1-b). The CTL and UCL were mechanically excised by inserting a streak with a cutter with a length of A mm (FIG. 1-c). Since the adhesive strength between the UCL and the conductive substrate 1 is not high, this mechanical excision is easy.
Example 2
FIG. 2 is a cross-sectional view of a principal part showing a manufacturing process of a photoreceptor according to another embodiment of the present invention. The undercoat layer (UCL) of the organic photoreceptor for liquid development is a nylon resin, the charge generation layer (CGL) is a phthalocyanine pigment and a vinyl chloride binder, the charge transport layer (CTL) is a charge transport layer material and has excellent solvent resistance. It is composed of a binder of dodecanedioic acid polymer-with 2,6-dimethoxy 9,10-anthracenediol or dodecanediol dichloride polymer-with 2,6-dimethoxy-9,10-anthracenediol, and UCL, CGL on the cylindrical aluminum substrate And CTL in this order. If it demonstrates in order of a figure, the said UCL and CGL will be apply | coated on an aluminum substrate (FIG. 2-a). The solvent DCM is applied to the cloth with the length A + 2 mm of the non-photosensitive layer portion to wipe off UCL and CGL, and then CTL is applied (FIG. 2-b). The CTL was mechanically excised by inserting a streak with a cutter with a length of A mm (FIG. 2-c). By doing so, both the undercoat layer and the charge generation layer are covered with the charge transport layer, and peeling of the photosensitive layer is prevented.
[0010]
【The invention's effect】
According to the present invention, the edge of the photosensitive layer is excised by excision of the charge generation layer before application of the charge transport layer with a solvent and mechanical excision of the charge transport layer and the undercoat layer after application of the charge transport layer, or The charge generation layer and the undercoat layer before application of the charge transport layer are removed by solvent removal and the charge transport layer is mechanically removed after the application of the charge transport layer to form both the undercoat layer and the charge generation layer or the charge generation layer. Since it is coated with a solvent-resistant charge transport layer, the erosion of the photosensitive layer due to the solvent is prevented and the printing durability is improved. The conventional photoconductor has a printing durability of 1 to 20,000 sheets, but the photoconductor of the present invention has a printing durability of 100,000 sheets.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part showing a manufacturing process of a photoconductor according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of a main part showing a manufacturing process of a photoconductor according to another embodiment of the invention. Cross-sectional view of the main part of an organic photoconductor
DESCRIPTION OF SYMBOLS 1 Conductive base |
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24891195A JP3617140B2 (en) | 1995-09-27 | 1995-09-27 | Organic photoreceptor for liquid development and method for producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24891195A JP3617140B2 (en) | 1995-09-27 | 1995-09-27 | Organic photoreceptor for liquid development and method for producing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0990662A JPH0990662A (en) | 1997-04-04 |
| JP3617140B2 true JP3617140B2 (en) | 2005-02-02 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24891195A Expired - Fee Related JP3617140B2 (en) | 1995-09-27 | 1995-09-27 | Organic photoreceptor for liquid development and method for producing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3617140B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100400024B1 (en) * | 2002-02-19 | 2003-09-29 | 삼성전자주식회사 | Method for preventing flow pattern of wet type color image forming apparatus and the system adopting the same |
| JP2009229481A (en) * | 2008-03-19 | 2009-10-08 | Kyocera Mita Corp | Lamination type electrophotographic photoreceptor and image forming apparatus |
-
1995
- 1995-09-27 JP JP24891195A patent/JP3617140B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0990662A (en) | 1997-04-04 |
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