Electrophotographic Photosensitive Member Charge-Transporting Layer
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Solution Overview
Problem
Existing electrophotographic photosensitive members face challenges in sustaining contact stress relaxation and potential stability during repeated use, with issues of image deterioration due to photo memory caused by potential differences between irradiated and non-irradiated portions.
Innovation Solution
An electrophotographic photosensitive member is developed with a charge-transporting layer featuring a matrix-domain structure, incorporating a polyester resin A with specific structural units and a charge-transporting substance, along with a matrix including a polyester resin C or polycarbonate resin D, which enhances contact stress relaxation and reduces photo memory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polyester resin having a specific siloxane structure is used to form a matrix-domain structure, then contact stress relaxation and potential stability are improved, but photo memory effect increases due to potential difference between irradiated and non-irradiated portions
Solution Approach 1:
The invention changes the chemical structure parameters of the polyester resin by specifying exact structural formulas (Formula A and Formula B with defined ratios). This structural modification allows the resin to simultaneously achieve contact stress relaxation and reduce photo memory effect by altering the molecular configuration and charge distribution characteristics of the material.
Solution Approach 2:
The invention creates a composite charge-transporting layer by combining the specifically structured polyester resin (with Formula A and Formula B units) with a charge-transporting substance. This composite structure leverages the complementary properties of the resin matrix and charge-transporting material to achieve both mechanical stability and reduced photo memory while maintaining charge transport functionality.
2Ease of operation
If the charge-transporting layer uses a lamination type structure with charge-generating layer and charge-transporting layer, then basic electrophotographic function is achieved, but image deterioration occurs due to contact stress during repeated use
Solution Approach 1:
The invention modifies the resin composition parameters within the lamination structure by incorporating the specifically structured polyester resin with controlled ratios of Formula A (6-40 mass%) and Formula B (60-94 mass%) units. This parameter optimization maintains the basic electrophotographic functionality while significantly improving resistance to contact stress and reducing image deterioration during repeated use.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves sustained contact stress relaxation, improved potential stability, and reduced photo memory, ensuring high performance and durability during repeated use.
Implementation Method 1
a charge-transporting layer formed on the charge-generating layer; wherein, the charge-transporting layer is a surface layer of the electrophotographic photosensitive member
Implementation Method 2
the use of a polyester resin having a specific siloxane structure allows for both of the sustained contact stress relaxation effect and the potential stability for repeating use
Data Source
AI summary
A charge-transporting layer includes a matrix-domain structure. The domain contains a polyester resin A. The matrix contains a charge-transporting substance and at least one of a polyester resin C and a polycarbonate resin D.