Electrophotographic Photosensitive Member Surface Layer Cross-Linking
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Solution Overview
Problem
Existing electrophotographic photosensitive members face issues with image deletion and electric potential stability due to the distortion of charge transporting structures during polymerization, leading to reduced mechanical durability and increased likelihood of image blur.
Innovation Solution
A surface layer containing a polymer produced by the polymerization of a compound with specific chain-polymerizable functional groups, such as methacryloyloxy groups, is used to enhance cross-linking density and prevent image deletion, while maintaining electric potential stability by optimizing the length of the alkylene group between the charge transporting structure and the methacryloyloxy group.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a surface layer contains a polymer produced by polymerization of a charge transporting substance having two or more chain-polymerizable functional groups to improve mechanical durability, then abrasion resistance is improved, but image deletion is more likely to occur
Solution Approach 1:
The patent changes the chemical structure parameters of the charge transporting substance by introducing specific substituent groups (electron-withdrawing groups like cyano, carbonyl, or ester groups at positions 2 and 6 of the phenyl ring) to modify the polymerization behavior and reduce distortion while maintaining cross-linking density
Solution Approach 2:
The patent uses a composite charge transporting substance that combines the charge transporting core structure with specific substituent groups containing chain-polymerizable functional groups, creating a material that achieves both mechanical durability and image deletion prevention through optimized molecular architecture
2Reliability
If a charge transporting substance having a methacryloyloxy group is used to prevent image deletion, then image deletion preventing effect is improved, but electric potential stability has more room for improvement
Solution Approach 1:
The patent optimizes the alkylene group length parameter (specifically using -CH2CH2- with 2 carbon atoms) between the charge transporting structure and methacryloyloxy group to achieve the right balance between preventing image deletion and maintaining electric potential stability
3Strength
If the surface layer is designed to improve mechanical durability, then abrasion resistance is improved, but electric potential stability deteriorates due to distortion of charge transporting structure
Solution Approach 1:
The patent changes the molecular structure parameters by introducing specific substituent groups and optimizing the alkylene group length to reduce polymerization-induced distortion of the charge transporting structure, thereby maintaining electric potential stability while achieving mechanical durability
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 effectively reduces image deletion and improves electric potential stability, ensuring high-quality image output and extended durability of the electrophotographic photosensitive member.
Implementation Method 1
a surface layer that contains a polymer produced by the polymerization of a compound having one or more chain-polymerizable functional groups
Data Source
AI summary
An electrophotographic photosensitive member having a surface layer that contains a polymer produced by the polymerization of a compound having a chain-polymerizable functional group. The compound having a chain-polymerizable functional group is a compound represented by the formula (1).