Charge Transport Layer Resin Composition for Photoreceptor Defect Reduction
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Solution Overview
Problem
Existing electrophotographic photoreceptors suffer from spot-like image defects due to foreign matter sticking and dielectric breakdown, which are not effectively addressed by current resin compositions.
Innovation Solution
Incorporating a polyester resin and a polycarbonate resin in the charge transport layer, specifically with certain diol units and dicarboxylic acid units, to enhance flexibility, abrasion resistance, and electrical stability, thereby reducing the occurrence of black spots and pinhole leaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a charge transport layer is made with conventional resins, then the basic charge transport function is achieved, but spot-like image defects occur due to foreign matter sticking and dielectric breakdown
Solution Approach 1:
The patent applies composite materials by combining polyester resin and polycarbonate resin in the charge transport layer. This composite resin system provides both the flexibility and abrasion resistance of polyester resin and the electrical stability and foreign matter resistance of polycarbonate resin, thereby suppressing spot-like image defects while maintaining charge transport function.
2Reliability
If the charge transport layer uses only polycarbonate resin, then electrical stability is improved, but flexibility and abrasion resistance are insufficient
Solution Approach 1:
The patent merges polyester resin and polycarbonate resin in a composite system where polyester resin contributes flexibility and abrasion resistance, while polycarbonate resin provides electrical stability and resistance to foreign matter sticking. The synergistic combination resolves the contradiction between electrical stability and mechanical properties.
3Strength
If the charge transport layer uses only polyester resin, then flexibility and abrasion resistance are improved, but electrical stability and foreign matter resistance are insufficient
Solution Approach 1:
The patent employs composite materials combining polyester resin and polycarbonate resin, where polyester resin provides the needed flexibility and abrasion resistance, while polycarbonate resin supplements electrical stability and foreign matter resistance, achieving a balance of all required properties.
4Stability of the object's composition
If foreign matter sticks to the photoreceptor surface, then the basic structure is maintained, but dielectric breakdown occurs causing black spots
Solution Approach 1:
The patent converts the harmful effect of foreign matter sticking into a beneficial outcome by using a composite resin system that specifically prevents dielectric breakdown. The polycarbonate resin component provides resistance to foreign matter sticking, while the polyester resin maintains structural stability, thereby preventing black spot formation even when foreign matter is present.
Data Source
AI summary
An electrophotographic photoreceptor includes a conductive substrate, and a lamination type photosensitive layer disposed on the conductive substrate and including a charge generation layer and a charge transport layer, in which the charge transport layer contains a charge transport material, a polyester resin, and a polycarbonate resin, and the polyester resin includes the following polyester resin (1),polyester resin (1): a polyester resin having at least one selected from the group including a diol unit (B3) represented by Formula (B3), a diol unit (B5) represented by Formula (B5), a diol unit (B6) represented by Formula (B6), a diol unit (B7) represented by Formula (B7), a diol unit (B8) represented by Formula (B8), a diol unit (B9) represented by Formula (B9), a diol unit (B10) represented by Formula (B10), and a diol unit (B11) represented by Formula (B11),in Formula (B3), Rb113 and Rb213 each independently represent a hydrogen atom, a linear alkyl group having 1 or more and 3 or less carbon atoms, an alkoxy group having 1 or more and 4 or less carbon atoms, or a halogen atom, d represents an integer of 7 or greater and 15 or less, and Rb403, Rb503, Rb803, and Rb903 each independently represent a hydrogen atom, an alkyl group having 1 or more and 4 or less carbon atoms, an alkoxy group having 1 or more and 6 or less carbon atoms, or a halogen atom,in Formula (B5), Ar105 represents an aryl group having 6 or more and 12 or less carbon atoms or an aralkyl group having 7 or more and 20 or less carbon atoms, Rb205 represents a hydrogen atom or an alkyl group having 1 or more and 3 or less carbon atoms, and Rb405, Rb505, Rb805, and Rb905 each independently represent a hydrogen atom, an alkyl group having 1 or more and 4 or less carbon atoms, an alkoxy group having 1 or more and 6 or less carbon atoms, or a halogen atom,in Formula (B6), Rb116 and Rb216 each independently represent a hydrogen atom, a linear alkyl group having 1 or more and 3 or less carbon atoms, an alkoxy group having 1 or more and 4 or less carbon atoms, or a halogen atom, e represents an integer of 4 or greater and 6 or less, and Rb406, Rb506, Rb806, and Rb906 each independently represent a hydrogen atom, an alkyl group having 1 or more and 4 or less carbon atoms, an alkoxy group having 1 or more and 6 or less carbon atoms, or a halogen atom,in Formula (B7), Rb407, Rb507, Rb807, and Rb907 each independently represent a hydrogen atom, an alkyl group having 1 or more and 4 or less carbon atoms, an alkoxy group having 1 or more and 6 or less carbon atoms, or a halogen atom,in Formula (B8), Rb408, Rb508, Rb808, and Rb908 each independently represent a hydrogen atom, an alkyl group having 1 or more and 4 or less carbon atoms, an alkoxy group having 1 or more and 6 or less carbon atoms, or a halogen atom,in Formula (B9), Rb109 represents an alkyl group having 1 or more and 8 or less carbon atoms, Rb209 represents an alkyl group having 1 or more and 3 or less carbon atoms, and Rb409, Rb509, Rb809, and Rb909 each independently represent a hydrogen atom, an alkyl group having 1 or more and 4 or less carbon atoms, an alkoxy group having 1 or more and 6 or less carbon atoms, or a halogen atom,in Formula (B10), Rb110 represents an alkyl group having 9 or more and 20 or less carbon atoms, Rb210 represents a hydrogen atom or an alkyl group having 1 or more and 3 or less carbon atoms, and Rb410, Rb510, Rb810, and Rb910 each independently represent a hydrogen atom, an alkyl group having 1 or more and 4 or less carbon atoms, an alkoxy group having 1 or more and 6 or less carbon atoms, or a halogen atom,in Formula (B11), Rb411, Rb511, Rb811, and Rb911 each independently represent a hydrogen atom, an alkyl group having 1 or more and 4 or less carbon atoms, an alkoxy group having 1 or more and 6 or less carbon atoms, or a halogen atom.