Electrophotographic Photosensitive Member Polyester Resin Ghost
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Solution Overview
Problem
Electrophotographic photosensitive members with polyester resin surface layers, while improving durability, fail to achieve sufficient responsiveness and prevent ghost phenomena effectively in recent applications.
Innovation Solution
Incorporating a polyester resin with specific structural units, such as those derived from dicarboxylic acid and bisphenol compounds, into the surface layer, which balances rigidity and flexibility, and optimizing the molecular structure to enhance charge mobility and prevent charge stagnation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polyester resin surface layer is used to improve durability, then mechanical strength and durability are improved, but responsiveness deteriorates and ghost phenomena occur
Solution Approach 1:
The patent changes the chemical structure parameters of the polyester resin by introducing specific structural units (formula I with X1=X2=H or formula II with specific R21-R26 groups) to optimize the balance between durability and responsiveness. This structural modification allows the resin to maintain mechanical strength while improving charge mobility and reducing ghost phenomena.
Solution Approach 2:
The patent creates a composite polyester resin structure combining rigid structural units (for durability) with flexible structural units (for responsiveness). The specific combination of dicarboxylic acid moieties, diol moieties, and their structural formulas creates a composite material that simultaneously achieves high durability and high charge mobility.
2Strength
If a polyester resin with high mechanical strength is used, then durability is improved, but charge mobility decreases leading to ghost phenomena
Solution Approach 1:
The patent modifies the molecular structure parameters of the polyester resin by incorporating specific structural units that balance rigidity and flexibility. The structural formulas (I and II) with specific substituent groups change the physical and electrical properties to achieve both high mechanical strength and high charge mobility.
Solution Approach 2:
The patent introduces specific structural units at localized positions within the polyester resin chain to create regions of enhanced charge mobility while maintaining overall structural integrity. The specific R groups and structural configurations provide local flexibility that facilitates charge transport without compromising global mechanical strength.
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 approach results in a photosensitive member with improved durability, responsiveness, and reduced ghost phenomena, meeting current demands for high performance in electrophotographic processes.
Implementation Method 1
a charge transporting material having a high charge mobility in the charge transport layer so as to increase the responsiveness of an electrophotographic photosensitive member
Data Source
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AI summary
An electrophotographic photosensitive member includes a surface layer containing a charge transporting material and a specific polyester resin having a structure including a specific branched chain.