EP0411532A2
Expired / Lapsed
EP
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Electrophotographic photoreceptor
Assignee: Mitsubishi Chemical Corp
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Filing: 1990-07-30
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Granted: —
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Expires: 2010-07-30
Abstract
Abstract Disclosed herein is an electrophotographic photoreceptor having on a conductive base at least one charge generation layer and at least one charge transport layer, said charge transport layer having the thickness of 27 µm or above and being formed with a coating solution containing a condensation polymer of the viscosity-average molecular weight of 15,000 to 25,0000 as a binder resin according to the dip coating method. The electrophotographic photoreceptor according to the present invention has the excellent durability because the resultant charge transport layer has the increased and uniform thickness without changing the electric properties, especially the charged potential.
Inventors
- 👤 Mamoru A-301 Mitsubishi-Kasei Nozomi
- 👤 Shigenori Otsuka
- 👤 Hiromi Horiuchi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 08:36
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/05; G03G5/0525; G03G5/0528; G03G5/0557; G03G5/056; G03G5/0564; G03G5/0596
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
63 words
An electrophotographic photoreceptor having on a conductive base at least one charge generation layer and at least one charge transport layer, said charge transport layer having a thickness of 27 µm or above and being formed with a coating solution containing a condensation polymer of a viscosity-average molecular weight of 15,000 to 25,000 as a binder resin according to a dip coating method.
Claim 2
Dependent Claim
63 words
An electrophotographic photoreceptor having on a conductive base at least one charge generation layer and at least one charge transport layer, said charge transport layer having a thickness of 27 µm or above and being formed with a coating solution containing a condensation polymer of a viscosity-average molecular weight of 15,000 to 25,000 as a binder resin according to a dip coating method.
Claim 3
Dependent Claim
35 words
The photoreceptor according to claim 1, wherein the condensation polymer is at least one resin selected from the group comprising polycarbonate, polyester, polysulfone, polyether, polyketone, polyimide, polyester carbonate, polybenzimidazole, polyether ketone, phenoxy and epoxy resins.
Claim 4
Dependent Claim
107 words
The photoreceptor according to claim 2, wherein the condensation polymer is a polycarbonate, polyester and/or polyester carbonate resin having repeating units which are represented by the following formulae (I) to (IV]: wherein R¹ and R² independently are hydrogen atoms, alkyl groups containing 1 to 3 carbon atoms, trifluoromethyl groups or phenyl groups, or alternatively R¹ together with R² may form a cycloalkylidene group: R³, R⁴, R⁵ and R⁶ independently are hydrogen atoms, halogen atoms or alkyl groups containing 1 to 3 carbon atoms; R⁷ is a residue of a divalent acid: and R⁸ is an alkylene group containing 2 to 6 carbon atoms or a 2,2-bis(4-hydroxycyclohexyl)propane residue.
Claim 5
Dependent Claim
19 words
The photoreceptor according to claim 1, wherein the charge transport layer has a thickness of 30 to 50 µm.
Claim 6
Dependent Claim
18 words
The photoreceptor according to claim 1, wherein the solid concentration of the coating solution is 25% or more.
Claim 7
Dependent Claim
18 words
The photoreceptor according to claim 5, wherein the solid concentration of the coating solution is 35% or less.
Claim 8
Dependent Claim
18 words
The photoreceptor according to claim 1, wherein the viscosity of the coating solution is 50 to 300 cPs.
Claim 9
Dependent Claim
18 words
The photoreceptor according to claim 7, wherein the viscosity of the coating solution is 50 to 200 cPs.
Claim 10
Dependent Claim
19 words
The photoreceptor according to claim 1, wherein the coating speed of the coating solution is 30 to 80 cm/min.
Claim 11
Dependent Claim
37 words
The photoreceptor according to claim 1, wherein the charge transport layer contains a charge transport material selected from the group comprising polyvinyl carbazole, polyvinyl pyrene, polyacenaphthylene, pyrazoline derivatives, oxazole derivatives, hydrazone derivatives, stilbene derivatives and amine derivatives.
Claim 12
Dependent Claim
44 words
The photoreceptor according to claim 1, wherein the charge transport layer comprises a charge transport material and the binder resin and the amount of the charge transport material is 30 to 200 parts by weight per 100 parts by weight of the binder resin.
Claim 13
Dependent Claim
30 words
The photoreceptor according to claim 11, wherein the amount of the charge transport material is 50 to 150 parts by weight per 100 parts by weight of the binder resin.
Claim 14
Dependent Claim
22 words
The photoreceptor according to claim 1, wherein the coating solution con tains a solvent having a boiling point of 35 to 150°C.
Claim 15
Dependent Claim
26 words
The photoreceptor according to claim 13, wherein the solvent is selected from the group comprising aromatic hydrocarbons, ketones, esters, alcohols, ethers, halogenated hydrocarbons, amides and dimethylsulfoxide.
Claim 16
Independent Claim
71 words
A method for preparation of an electrophotographic photoreceptor which has on a conductive base at least one charge generation layer and at least one charge transport layer, characterized in that said charge transport layer is formed into a thickness of 27 µm or above according to a dip coating method using a coating solution containing a condensation polymer of a viscosity-average molecular weight of 15,000 to 25,000 as a binder resin.
Claim 17
Independent Claim
71 words
A method for preparation of an electrophotographic photoreceptor which has on a conductive base at least one charge generation layer and at least one charge transport layer, characterized in that said charge transport layer is formed into a thickness of 27 µm or above according to a dip coating method using a coating solution containing a condensation polymer of a viscosity-average molecular weight of 15,000 to 25,000 as a binder resin.
References Cited (Backward Citations)
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