Polycarbonate Charge Transporting Layer for Electrophotographic Photosensitive Member
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Solution Overview
Problem
Electrophotographic photosensitive members with charge transporting layers face challenges in durability, leading to issues like fogging, uneven density, and potential variation during high-speed recording, which existing technologies have not adequately addressed.
Innovation Solution
The use of a polycarbonate resin with specific structural units in the charge transporting layer, such as those represented by formulas (1-1), (1-2), and (1-3), which improves wear resistance, responsivity, and crack resistance, while maintaining compatibility with charge transport materials, thereby enhancing the performance of the electrophotographic photosensitive member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a charge transporting layer is used to improve electrophotographic performance, then recording speed and image quality are improved, but durability deteriorates leading to fogging, uneven density, and potential variation
Solution Approach 1:
The patent changes the chemical structure parameters of the polycarbonate resin by introducing specific structural units (formulas 1-1, 1-2, 1-3) with particular substituent groups and ratios. This modifies the resin's properties to achieve both high recording speed performance and durability by optimizing the balance between charge transport capability and wear resistance
Solution Approach 2:
The patent creates a composite charge transporting layer by combining polycarbonate resin with specific structural units and charge transport materials in defined ratios. This composite structure integrates the advantages of both components to achieve high productivity while maintaining reliability through improved wear resistance and reduced fogging
2Reliability
If the charge transporting layer is made more durable to prevent fogging and uneven density, then reliability is improved, but recording speed and responsivity deteriorate
Solution Approach 1:
The patent optimizes the chemical composition parameters of the polycarbonate resin by controlling the types and ratios of structural units (formulas 1-1, 1-2, 1-3). This parameter optimization ensures that the resin maintains sufficient wear resistance for durability while preserving the charge transport properties necessary for high responsivity and recording speed
3Strength
If a polycarbonate resin with high wear resistance is used to improve durability, then crack resistance is improved, but compatibility with charge transport materials and electrophotographic performance deteriorate
Solution Approach 1:
The patent modifies the polycarbonate resin structure by incorporating specific structural units (formulas 1-1, 1-2, 1-3) with controlled substituent groups and molecular architecture. These structural changes enhance crack resistance through improved mechanical strength while maintaining compatibility with charge transport materials by preserving appropriate polarity and molecular flexibility
Solution Approach 2:
The patent forms a composite system where the modified polycarbonate resin serves as a binder that is compatible with charge transport materials. The specific structural units in the resin create a matrix that provides both mechanical integrity (crack resistance) and chemical compatibility, enabling high electrophotographic performance through effective charge transport
Data Source
AI summary
An electrophotographic photosensitive member includes a support, a charge generating layer containing a charge generation material, and a charge transporting layer containing a charge transport material in this order, the charge transporting layer serving as a surface layer. The charge transporting layer contains a polycarbonate resin having a particular structural unit.