Electrophotographic Photoreceptor Protective Layer
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Solution Overview
Problem
Existing electrophotographic photoreceptors face challenges in maintaining wear resistance, scratch resistance, and cleaning properties over time due to the limitations of fluorine-based materials, which either compromise mechanical strength or lead to insufficient cleaning performance when used repeatedly.
Innovation Solution
An electrophotographic photoreceptor with a protective layer formed from a polymerized and cured product of a radically polymerizable composition containing a perfluoropolyether compound and metal oxide fine particles, which are both bonded through radical polymerization, enhancing both wear resistance and cleaning properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fluorine-based materials are added to the protective layer to decrease toner adhesivity and increase cleaning property, then cleaning property is improved, but the hardness of the surface of the protective layer becomes insufficient
Solution Approach 1:
The patent combines fluorine-based materials with silane-based crosslinking agents to create a composite protective layer. The silane component forms a crosslinked network structure that provides hardness and mechanical strength, while the fluorine-based material maintains low surface energy for toner release. This composite approach allows both cleaning property and surface hardness to be achieved simultaneously.
Solution Approach 2:
The patent modifies the chemical composition parameters of the protective layer by introducing silane groups that undergo crosslinking reactions. This changes the physical and chemical properties of the protective layer, specifically increasing crosslinking density and surface hardness while maintaining fluorine content for cleaning performance.
2Ease of operation
If fluorine-based materials are added in high concentration to achieve high cleaning property, then cleaning property is improved initially, but the cleaning property becomes insufficient when the photoreceptor is repeatedly used
Solution Approach 1:
The patent applies silane-based crosslinking agents to the protective layer before use, creating a pre-formed crosslinked network structure. This preliminary crosslinking action ensures that the protective layer maintains its mechanical integrity and fluorine material distribution over repeated use cycles, preventing the degradation of cleaning property that occurs with conventional formulations.
Solution Approach 2:
The combination of fluorine-based materials with crosslinked silane structures creates a more stable composite protective layer. The crosslinked network prevents excessive migration and concentration of fluorine materials, ensuring consistent cleaning performance throughout the photoreceptor's operational life.
3Ease of operation
If the content of perfluoropolyether compound is increased to maintain cleaning property, then cleaning property is maintained, but wear resistance and scratch resistance decrease due to reduced mechanical strength
Solution Approach 1:
The patent creates a composite protective layer where silane-based crosslinking agents form a strong network matrix that compensates for the mechanical strength reduction caused by high perfluoropolyether content. The crosslinked structure provides the necessary mechanical strength for wear and scratch resistance while the perfluoropolyether maintains cleaning property.
Solution Approach 2:
The patent creates different functional zones within the protective layer: the crosslinked silane network provides mechanical strength and structural integrity, while the perfluoropolyether regions provide low surface energy for cleaning. This spatial differentiation of properties allows both high cleaning performance and adequate mechanical strength to coexist.
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 a photoreceptor with improved wear resistance, scratch resistance, and sustained cleaning performance over a long period, preventing image defects and ensuring stable image formation.
Implementation Method 1
the protective layer is formed of a polymerized and cured product of a radically polymerizable composition containing a radically polymerizable monomer, a perfluoropolyether compound having a radically polymerizable group, and metal oxide fine particles having a radically polymerizable group
Data Source
AI summary
An electrophotographic photoreceptor includes: a conductive support; a photosensitive layer disposed on the conductive support; and a protective layer disposed on the photosensitive layer, wherein the protective layer is formed of a polymerized and cured product of a radically polymerizable composition containing a radically polymerizable monomer, a perfluoropolyether compound having a radically polymerizable group, and metal oxide fine particles having a radically polymerizable group.