JP2511467B2 - Method for manufacturing positively chargeable organic laminated photoreceptor - Google Patents
Method for manufacturing positively chargeable organic laminated photoreceptorInfo
- Publication number
- JP2511467B2 JP2511467B2 JP62196792A JP19679287A JP2511467B2 JP 2511467 B2 JP2511467 B2 JP 2511467B2 JP 62196792 A JP62196792 A JP 62196792A JP 19679287 A JP19679287 A JP 19679287A JP 2511467 B2 JP2511467 B2 JP 2511467B2
- Authority
- JP
- Japan
- Prior art keywords
- charge
- layer
- solvent
- charge transport
- transport layer
- 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.)
- Expired - Fee Related
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
- G03G5/02—Charge-receiving layers
- G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
- G03G5/05—Organic bonding materials; Methods for coating a substrate with a photoconductive layer; Inert supplements for use in photoconductive layers
- G03G5/0525—Coating methods
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は電子写真感光体、特に正帯電型有機積層感光
体の製造方法、より詳細には電荷発生層を複数の溶剤を
用いて塗布する正帯電型有機積層感光体の製造方法に関
する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for producing an electrophotographic photoreceptor, particularly a positively chargeable organic laminated photoreceptor, and more specifically, a charge generation layer is coated with a plurality of solvents. The present invention relates to a method for manufacturing a positively chargeable organic laminated photoconductor.
従来、電子写真用感光体としては、導電性基体上に、
種々の無機或いは有機の光導電体の層を設けたものが広
く使用されている。このような感光体の一種として、キ
ャリア発生物質とキャリア輸送物質とを積層型に或いは
分散型に組み合わせた所謂機能分離型有機感光体が知ら
れている。Conventionally, as an electrophotographic photoreceptor, on a conductive substrate,
Those provided with layers of various inorganic or organic photoconductors are widely used. As one type of such a photoreceptor, a so-called function-separated type organic photoreceptor in which a carrier generating substance and a carrier transporting substance are combined in a laminated type or a dispersed type is known.
公知の機能分離型有機感光体には負帯電型のものが多
いが、負帯電型感光体では帯電時にオゾン発生の問題が
あることから、正帯電型有機感光体が強く要望されてい
る。Many of the known function-separated type organic photoconductors are of the negative charging type, but there is a strong demand for positive charging type organic photoconductors because the negative charging type photoconductor has a problem of ozone generation during charging.
正帯電型有機感光体としては、正孔輸送性を有する電
荷輸送層の上に電荷発生層を積層した構成のものが知ら
れている。As a positive charging type organic photoreceptor, one having a structure in which a charge generating layer is laminated on a charge transporting layer having a hole transporting property is known.
しかしながら、この構成のように電荷輸送層上に電荷
輸送層を形成させた感光体は、電荷発生層上に電荷輸送
層を形成させた感光体よりも感度が劣る。これは、電荷
発生層と電荷輸送層の間の界面相溶性が不充分なため、
電荷発生層で発生した光電荷が効率良く電荷輸送層に注
入されないためと考えられる。However, the photoconductor having the charge transport layer formed on the charge transport layer as in this configuration is inferior in sensitivity to the photoconductor having the charge transport layer formed on the charge generation layer. This is because the interfacial compatibility between the charge generation layer and the charge transport layer is insufficient,
It is considered that the photocharges generated in the charge generation layer are not efficiently injected into the charge transport layer.
本発明の目的は、導電性基体と該基体上の電荷輸送層
と電荷輸送層上の電荷発生層とを有する有機積層感光体
において、電荷注入を効率良くし、感度を向上させるこ
とが容易にできる積層感光体の製造方法を提供すること
にある。An object of the present invention is to facilitate charge injection efficiently and improve sensitivity in an organic laminated photoreceptor having a conductive substrate, a charge transport layer on the substrate, and a charge generation layer on the charge transport layer. It is an object of the present invention to provide a method for manufacturing a laminated photoreceptor that can be used.
上記目的は導電性基体と、該基体上の電荷輸送層と電
荷輸送層上の電荷発生層とを有する有機積層感光体の製
造に当り、 電荷輸送層を構成する結合剤樹脂、正孔輸送物質どち
らも溶解しない溶剤（Ａ）に、電荷輸送層を構成する結
合剤樹脂は溶解しないが、正孔輸送物質を溶解する溶剤
（Ｂ）を添加した溶媒を使用して電荷発生層用の塗布液
を作成し、電荷輸送層上の塗布することにより達成され
る。The above object is to manufacture an organic laminated photoreceptor having a conductive substrate, a charge transporting layer on the substrate and a charge generating layer on the charge transporting layer. A binder resin and a hole transporting substance constituting the charge transporting layer. A coating solution for a charge generation layer using a solvent to which a binder resin constituting the charge transport layer is not dissolved in a solvent (A) in which neither is dissolved, but a solvent (B) which dissolves a hole transport substance is added. Is prepared and coated on the charge transport layer.
本発明で製造される正帯電型有機積層感光体は、導電
性基体、該基体上の電荷輸送層、該電荷輸送層上の電荷
発生層で構成される。The positively chargeable organic laminated photoreceptor prepared by the present invention comprises a conductive substrate, a charge transport layer on the substrate, and a charge generation layer on the charge transport layer.
電荷輸送層は、正孔輸送物質を含む結合剤樹脂層から
成り、電荷発生層は電荷発生物質を含む結合剤樹脂層か
らなる。The charge transport layer is composed of a binder resin layer containing a hole transport material, and the charge generation layer is composed of a binder resin layer containing a charge generation material.
本発明の積層感光体の製造に当たっては、結合剤樹脂
および正孔輸送物質を溶解した溶液を作成し、この溶液
を導電性基体表面に塗布乾燥して電荷輸送層を形成させ
る。次に、結合剤樹脂を溶媒に溶解し、電荷発生物質を
加えて、ボールミルなどで分散させ、電荷発生層の塗布
溶液を作成する。In the production of the laminated photoreceptor of the present invention, a solution in which a binder resin and a hole transport material are dissolved is prepared, and this solution is applied on the surface of a conductive substrate and dried to form a charge transport layer. Next, the binder resin is dissolved in a solvent, a charge generating substance is added, and the mixture is dispersed by a ball mill or the like to prepare a coating solution for the charge generating layer.
電荷発生層用塗布液の溶媒として、電荷輸送層を構成
する結合剤樹脂、正孔輸送物質どちらも溶解しない溶剤
（Ａ）に、電荷輸送層を構成する結合剤樹脂は溶解しな
いが、正孔輸送物質を溶解する溶剤（Ｂ）を添加した溶
媒を使用することが本発明の重要な特徴である。As a solvent of the charge generation layer coating liquid, the binder resin constituting the charge transport layer is insoluble in the solvent (A) in which neither the binder resin constituting the charge transport layer nor the hole transport substance is dissolved, It is an important feature of the present invention to use a solvent added with a solvent (B) which dissolves the transport substance.
上記の溶媒を使用すると、電荷発生層塗布時に、電荷
発生層用塗布液の溶媒が電荷輸送の結合剤樹脂の間に浸
透し、溶剤（Ｂ）成分に正孔輸送物質が溶解し、正孔輸
送物質を層界面付近に移動させることができる。この状
態で溶媒の蒸発が行われると、層界面付近に正孔輸送物
質が連続的に存在させることができるため電荷発生層か
ら、電荷輸送層への電荷の注入が極めて効率良く行われ
ることになる。When the above-mentioned solvent is used, the solvent of the charge generation layer coating solution permeates between the charge transport binder resin during the charge generation layer coating, the hole transport substance is dissolved in the solvent (B) component, and The transport substance can be moved near the layer interface. When the solvent is evaporated in this state, the hole transport material can be continuously present near the layer interface, so that the charge injection from the charge generation layer to the charge transport layer is performed very efficiently. Become.
〔発明の好適態様〕 上記導電性基体としては、シート状やドラム状のいず
れであってもよく、基材自体が導電性を有するか、基材
の表面が導電性を有し、使用に際し充分な機械的強度を
有するものが好ましい。[Preferred Embodiment of the Invention] The conductive substrate may be in the form of a sheet or a drum, and the base material itself has conductivity, or the surface of the base material has conductivity, which is sufficient for use. Those having various mechanical strengths are preferable.
電荷輸送層に含有させる正孔輸送物質としては、それ
自体公知の任意の物質が制限なしに使用され、たとえ
ば、フェナントレン、Ｎ−エチルカルバゾール、2,5−
ジフェニル−1,3,4−オキサジアゾール、2,5,−ビス
（４−ジエチルアミノフェニル）−1,3,4−オキサジア
ゾール、ビス−ジエチルアミノフェニル−1,3,6−オキ
サジアゾール、4,4′−ビス（ジエチルアミノ）−2,2′
−ジメチルトリフェニルメタン、2,4,5−トリアミノフ
ェニルイミダゾール、2,5−ビス（４−ジエチルアミノ
フェニル）−1,3,4−トリアゾール、１−フェニル−３
−（４−ジエチルアミノスチリル）−５−（４−ジエチ
ルアミノフェニル）−２−ピラゾリン、Ｐ−ジエチルア
ミノベンズアルデヒドジフェニルヒドラゾン、N,N,N′,
N′−テトラフェニルベンジジンなどであるが、勿論例
示したものに制限されない。結合剤としては、種々のも
のの、例えばスチレン系重合体、スチレン−ブタジエン
共重合体、スチレン−アクリロニトリル共重合体、スチ
レン−マレイン酸共重合体、アクリル系重合体、スチレ
ン−アクリル系共重合体、エチレン−酢酸ビニル共重合
体、ポリ塩化ビニル、塩化ビニル−酢酸ビニル共重合
体、ポリエステル、アルキッド樹脂、ポリアミド、ポリ
ウレタン、ポリカーボネート、ポリアリレート、ポリス
ルホン、ジアリルフタレート樹脂、ケトン樹脂、ポリビ
ニルブチラール樹脂、ポリエーテル樹脂、等の熱可塑性
樹脂や、シリコーン樹脂、エポキシ樹脂、フェノール樹
脂、尿素樹脂、メラニン樹脂、その他架橋性の熱硬化性
樹脂、および、エポキシアクリレート、ウレタン−アク
リレート等の光硬化型樹脂等の重合体が使用できる。な
お、電荷発生層塗布時に溶媒に溶解しないことが必要条
件であり、硬化性の樹脂を使用すると、電荷発生層塗布
用の溶媒を自由に選ぶことができる。As the hole-transporting substance contained in the charge-transporting layer, any substance known per se can be used without limitation, and examples thereof include phenanthrene, N-ethylcarbazole and 2,5-
Diphenyl-1,3,4-oxadiazole, 2,5, -bis (4-diethylaminophenyl) -1,3,4-oxadiazole, bis-diethylaminophenyl-1,3,6-oxadiazole, 4,4'-bis (diethylamino) -2,2 '
-Dimethyltriphenylmethane, 2,4,5-triaminophenylimidazole, 2,5-bis (4-diethylaminophenyl) -1,3,4-triazole, 1-phenyl-3
-(4-Diethylaminostyryl) -5- (4-diethylaminophenyl) -2-pyrazoline, P-diethylaminobenzaldehyde diphenylhydrazone, N, N, N ',
Examples thereof include N'-tetraphenylbenzidine, but are not limited to the exemplified ones. As the binder, various ones, for example, a styrene-based polymer, a styrene-butadiene copolymer, a styrene-acrylonitrile copolymer, a styrene-maleic acid copolymer, an acrylic polymer, a styrene-acrylic copolymer, Ethylene-vinyl acetate copolymer, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polyester, alkyd resin, polyamide, polyurethane, polycarbonate, polyarylate, polysulfone, diallylphthalate resin, ketone resin, polyvinyl butyral resin, polyether Resins such as thermoplastic resins, silicone resins, epoxy resins, phenol resins, urea resins, melanin resins, other crosslinkable thermosetting resins, and photocurable resins such as epoxy acrylates and urethane-acrylates. Coalescing can be used . In addition, it is a necessary condition that the solvent is not dissolved in the solvent at the time of coating the charge generation layer, and if a curable resin is used, the solvent for coating the charge generation layer can be freely selected.
電荷発生層の結合剤樹脂としては前に例示したものの
中から、適当なものを用いることができるが、電荷発生
層塗布用の溶剤に溶解することが必要条件である。溶剤
（Ａ）としては、電荷輸送層の結合剤樹脂を溶解せず、
かつ正孔輸送物質を溶解しないものが使用される。例え
ば、表１を参照して、正孔輸送物質にDEHを使用する場
合はｎ−BuOHが使用でき、正孔輸送物質にMEKを使用す
る場合はMEKも、使用することができる。溶剤（Ｂ）と
しては、電荷輸送層の結合剤樹脂を溶解せず、正孔輸送
物質を溶解するものが使用される。例えば、表１を参照
して、正孔輸送物質にMKHを使用する場合はキシレン、T
HFが使用でき、正孔輸送物質にDEHを使用する場合はMEK
も、使用することができる。As the binder resin for the charge generation layer, a suitable binder resin can be used among those exemplified above, but it is necessary to dissolve it in a solvent for coating the charge generation layer. The solvent (A) does not dissolve the binder resin in the charge transport layer,
In addition, a material that does not dissolve the hole transport material is used. For example, referring to Table 1, n-BuOH can be used when DEH is used as the hole transport material, and MEK can be used when MEK is used as the hole transport material. As the solvent (B), a solvent that does not dissolve the binder resin of the charge transport layer but dissolves the hole transport substance is used. For example, referring to Table 1, when MKH is used as the hole transport material, xylene, T
MEK when HF can be used and DEH is used as the hole transport material
Can also be used.
溶剤（Ａ）と溶剤（Ｂ）の配合比は溶剤の、組み合わ
せや、電荷輸送層中の正孔輸送物質により、適切に選択
する必要があるが、溶剤（Ｂ）が全体の25〜95重量％を
占めることが望ましい。溶剤（Ｂ）の配合比が小さい
と、電荷発生層塗布時に、溶媒は電荷輸送層の正孔輸送
物質が溶解せずに本発明の効果が発揮されない。また、
溶剤（Ｂ）の配合比が大きい場合は、電荷輸送層の正孔
輸送物質の溶解が激しすぎるため、電荷輸送層からの溶
質が起こってしまい電荷輸送層の正孔輸送物質の濃度が
低下するため感光体感度の著しい低下をまねくおそれが
ある。 The mixing ratio of the solvent (A) and the solvent (B) needs to be appropriately selected depending on the combination of the solvents and the hole transport material in the charge transport layer, but the solvent (B) is 25 to 95% by weight in total. It is desirable to occupy%. When the compounding ratio of the solvent (B) is low, the solvent does not dissolve the hole transporting substance in the charge transporting layer at the time of coating the charge generating layer, and the effect of the present invention is not exhibited. Also,
When the compounding ratio of the solvent (B) is large, the hole transporting substance in the charge transporting layer is excessively dissolved, so that solute is generated from the charge transporting layer and the concentration of the hole transporting substance in the charge transporting layer is lowered. Therefore, there is a possibility that the sensitivity of the photoconductor may be significantly reduced.
実施例１ 正孔輸送物質ジエチルアミノベンズアルデヒドジフェ
ニルヒドラゾン１重量部と、熱硬化性樹脂−ポリメチル
メタクリレート架橋型（「ダイアナールSE5377」三菱レ
ーヨン社製）１重量部をテトラヒドロフランに溶解し、
アルミニウム箔上に塗布乾燥して、膜厚20μｍの電荷輸
送層を形成した。Example 1 1 part by weight of a hole transporting material, diethylaminobenzaldehyde diphenylhydrazone, and 1 part by weight of a thermosetting resin-polymethylmethacrylate cross-linking type (“Dianal SE5377” manufactured by Mitsubishi Rayon Co., Ltd.) were dissolved in tetrahydrofuran.
It was applied on an aluminum foil and dried to form a charge transport layer having a film thickness of 20 μm.
ブチラール樹脂（「エスレックBM−１」積水化学社
製）１重量部を表１に示す溶媒で溶解し、電荷発生物質
ジブロモアンサンスロン２重量部を加え、ボールミルで
15時間分散して電荷発生層用塗布液を作成し電荷輸送層
上に塗布乾燥して膜厚２μｍの電荷発生層を作成した。1 part by weight of butyral resin (“ESREC BM-1” manufactured by Sekisui Chemical Co., Ltd.) was dissolved in the solvent shown in Table 1, 2 parts by weight of the charge generating substance dibromoanthanthurone was added, and the mixture was mixed with a ball mill.
The dispersion liquid was dispersed for 15 hours to prepare a charge generation layer coating liquid, which was coated on the charge transport layer and dried to form a charge generation layer having a film thickness of 2 μm.
実施例２ 実施例１の正孔輸送物質をジエチルアミノベンズアル
デヒドジフェニルヒドラゾンに変えて、Ｎ−エチルカル
バゾール−３−カルバルデヒドジフェニルヒドラゾンを
使用し、実施例１と同様に感光体を作成した。Example 2 A photoreceptor was prepared in the same manner as in Example 1, except that N-ethylcarbazole-3-carbaldehydediphenylhydrazone was used in place of diethylaminobenzaldehyde diphenylhydrazone as the hole transport material.
こうして得られた電子写真感光体を円筒状支持体から
剥離し、静電試験気（「SP−428型」川口電機製作所
製）に装着し次の特性試験を行った。すなわち帯電型に
＋5.5kVの電圧を印加して２秒間コロナ放電により感光
層を帯電せしめた後、２秒間放置し（このときの電位を
V0とする）、次いで感光体表面における照度が10luxと
なる状態でタングステンランプより光を照射して感光体
の表面電位を1/2に減衰せしめるのに必要な露光量（半
減露光量E1/2）を求めた。また６秒間露光後の電位（残
留電位VR）を求めた。The electrophotographic photosensitive member thus obtained was peeled from the cylindrical support and mounted on an electrostatic test air (“SP-428 type” manufactured by Kawaguchi Denki Seisakusho) to perform the following characteristic test. That is, a voltage of +5.5 kV is applied to the charging type and the photosensitive layer is charged by corona discharge for 2 seconds, and then left for 2 seconds (the potential at this time is
V 0 ), and then the amount of exposure required to reduce the surface potential of the photoconductor to 1/2 by irradiating it with light from a tungsten lamp while the illuminance on the photoconductor surface is 10 lux (half exposure E1 / 2) asked. Further, the potential after exposure for 6 seconds (residual potential V R ) was determined.
実施例１の結果を表２に、実施例２の結果を表３に示
す。The results of Example 1 are shown in Table 2 and the results of Example 2 are shown in Table 3.
正孔輸送物質を溶解しないｎ−ブチルアルコールを電
荷発生層用塗布液の溶媒として使用した時は、電荷発生
層から電荷輸送層への電荷の注入が効率良く行われない
ので、実施例１、２共、半減露光量が大きく感度が悪く
なっている。 When n-butyl alcohol, which does not dissolve the hole-transporting substance, was used as a solvent for the charge generation layer coating liquid, charge injection from the charge generation layer to the charge transport layer was not performed efficiently. In both cases, the half exposure amount is large and the sensitivity is poor.
一方、正孔輸送物質を溶解するテトラヒドロフランを
電荷発生層用塗布液の溶媒として使用した時は、電荷輸
送層中の正孔輸送物質が溶出し、結果として電荷輸送層
中の正孔輸送物質濃度が低下するために、感度が悪くな
っている。On the other hand, when tetrahydrofuran, which dissolves the hole-transporting substance, is used as the solvent for the charge generation layer coating liquid, the hole-transporting substance in the charge-transporting layer elutes, resulting in the concentration of the hole-transporting substance in the charge-transporting layer. The sensitivity is poor due to the decrease in.
また、実施例１と実施例２を比較すると、実施例１で
はテトラヒドロフランの溶媒に占める割合が80のときに
感度が最も良くなっているのに対し、実施例２では90％
のときに感度が最も良くなっている。これは、ジエチル
アミノベンズアルデヒドジフェニルヒドラゾンがＮ−エ
チルカルバゾール−３−カルバルデヒドジフェニルヒド
ラゾンに比べて、テトラヒドロフランに対する溶解性が
高く、80％以上含有する場合に電荷輸送層からの溶出が
起こり始めるので、実施例１では実施例２よりテトラヒ
ドロフランの含有量が低いところで、感度が最も良くな
っているためである。Further, comparing Example 1 and Example 2, the sensitivity was highest in Example 1 when the ratio of tetrahydrofuran to the solvent was 80, whereas in Example 2 90% was obtained.
The sensitivity is highest when. This is because diethylaminobenzaldehyde diphenylhydrazone has a higher solubility in tetrahydrofuran than N-ethylcarbazole-3-carbaldehydediphenylhydrazone, and when 80% or more is contained, elution from the charge transport layer begins to occur. This is because in Example 1, the sensitivity is highest when the content of tetrahydrofuran is lower than in Example 2.
本発明の製造方法によると、導電性基体と該基体上の
電荷輸送層と電荷輸送層上の電荷発生層とから成る有機
積層感光体において、電荷注入を効率良くし、感度を向
上させることが容易にできる。According to the production method of the present invention, it is possible to improve the efficiency of charge injection and improve the sensitivity in an organic laminated photoreceptor including a conductive substrate, a charge transport layer on the substrate, and a charge generation layer on the charge transport layer. You can easily.
Claims (1)
該電荷輸送層上の電荷発生層とを有する有機積層感光体
の製造に当り、 電荷輸送層を構成する結着剤樹脂、及び正孔輸送物質の
どちらも溶解しない溶剤（Ａ）に、 電荷輸送層を構成する結着剤樹脂は溶解しないが、正孔
輸送物質を溶解する溶剤（Ｂ）を、 添加した溶媒を使用して電荷発生層の塗布液を作成し、 電荷輸送層上に塗布することを特徴とする正帯電型有機
積層感光体の製造方法。1. A conductive substrate, and a charge transport layer on the substrate,
In the production of an organic laminated photoreceptor having the charge generation layer on the charge transport layer, the charge transport is carried out in a solvent (A) in which neither the binder resin constituting the charge transport layer nor the hole transport substance is dissolved. The binder resin that constitutes the layer is not dissolved, but the solvent (B) that dissolves the hole transport substance is used to prepare a coating solution for the charge generation layer using the added solvent, and the solution is coated on the charge transport layer. A method for producing a positively chargeable organic laminated photoconductor, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62196792A JP2511467B2 (en) | 1987-08-06 | 1987-08-06 | Method for manufacturing positively chargeable organic laminated photoreceptor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62196792A JP2511467B2 (en) | 1987-08-06 | 1987-08-06 | Method for manufacturing positively chargeable organic laminated photoreceptor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6440834A JPS6440834A (en) | 1989-02-13 |
| JP2511467B2 true JP2511467B2 (en) | 1996-06-26 |
Family
ID=16363724
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62196792A Expired - Fee Related JP2511467B2 (en) | 1987-08-06 | 1987-08-06 | Method for manufacturing positively chargeable organic laminated photoreceptor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2511467B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5787914B2 (en) | 2013-01-30 | 2015-09-30 | 京セラドキュメントソリューションズ株式会社 | Positively charged electrophotographic photosensitive member and image forming apparatus |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61179455A (en) * | 1985-02-05 | 1986-08-12 | Canon Inc | Preparation of electrophotographic sensitive body |
-
1987
- 1987-08-06 JP JP62196792A patent/JP2511467B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6440834A (en) | 1989-02-13 |
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