Electrophotographic Photosensitive Member Surface Layer
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Solution Overview
Problem
Electrophotographic photosensitive members with polyfunctional acrylate monomers in the surface layer exhibit enhanced abrasion resistance but deteriorated electrical characteristics compared to those without such monomers.
Innovation Solution
A surface layer comprising a copolymerized product of a hole transporting compound with an acryloyloxy or methacryloyloxy group and a triphenylamine backbone, combined with a compound represented by specific formulas, forming a dense three-dimensional crosslinked structure to improve abrasion resistance while maintaining good electrical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a polyfunctional acrylate monomer is contained in the surface layer, then abrasion resistance is enhanced, but electrical characteristics are deteriorated
Solution Approach 1:
The patent extracts the problematic polyfunctional acrylate monomer from the surface layer composition and replaces it with a polyfunctional carboxylate monomer that does not interfere with charge transport, thereby eliminating the harmful effect while preserving the beneficial crosslinking effect for abrasion resistance
Solution Approach 2:
The patent changes the chemical parameter of the monomer from acrylate to carboxylate functional group, which fundamentally alters the interaction with charge carriers while maintaining the crosslinking capability needed for mechanical durability
2Strength
If a copolymerized product with polyfunctional acrylate monomer is used in the surface layer, then abrasion resistance is improved, but hole transportation is inhibited
Solution Approach 1:
The patent removes the polyfunctional acrylate monomer that causes hole transportation inhibition and substitutes it with a polyfunctional carboxylate monomer that provides crosslinking without interfering with charge transport mechanisms
Solution Approach 2:
The patent introduces a triphenylamine-based hole transporting compound as an intermediary substance that facilitates charge transport while the polyfunctional carboxylate monomer provides structural crosslinking, separating the conflicting functions into different molecular roles
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 provides an electrophotographic photosensitive member with excellent abrasion resistance and electrical characteristics, as the copolymerized product inhibits hole transportation issues associated with polyfunctional acrylate monomers, ensuring durability and image quality.
Implementation Method 1
a surface layer of the electrophotographic photosensitive member includes a copolymerized product of: a hole transporting compound having an acryloyloxy group or a methacryloyloxy group and having a triphenylamine backbone and a compound represented by the formula (1) or the formula (2)
Data Source
AI summary
To provide an electrophotographic photosensitive member being excellent in abrasion resistance and having good electrical characteristics. The surface layer of the electrophotographic photosensitive member contains a copolymerized product of a hole transporting compound having a specified structure and a compound having a specified structure.