Electrophotographic Photoreceptor Surface Layer with Reactive Intermediary
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Solution Overview
Problem
Existing electrophotographic photoreceptors face issues with scratches and decreased electrical characteristics due to the addition of inorganic particles, which affect mechanical strength and image quality, especially after repeated use.
Innovation Solution
The use of a conductive substrate with a photosensitive layer and an outermost surface layer composed of a cured film containing specific reactive group-containing charge transporting materials and inorganic particles with polymerizable groups, which improves both mechanical strength and electrical characteristics by enhancing interfacial adhesiveness and inhibiting charge distribution and polar group exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If inorganic particles are added to the protective layer, then mechanical strength is improved, but scratches and image defects occur due to poor interfacial adhesiveness
Solution Approach 1:
The patent introduces a specific reactive compound as an intermediary substance between the inorganic particles and the organic binder resin. This compound contains both inorganic particle affinity groups (such as silane groups) and organic polymerizable groups, acting as a bridge that enhances interfacial adhesiveness. The intermediary enables strong bonding between the inorganic particles and the organic matrix, preventing scratches and image defects while maintaining mechanical strength improvement.
Solution Approach 2:
The patent creates a composite protective layer system consisting of three components: inorganic particles, organic binder resin, and a specific reactive compound that combines both inorganic and organic characteristics. This tri-component composite structure optimizes the interface between dissimilar materials, allowing the inorganic particles to provide mechanical strength while the reactive compound ensures proper adhesion, preventing image defects and scratches.
2Ease of manufacture
If acrylic materials are used for the protective layer, then ease of manufacture is improved, but curing conditions and atmosphere strongly affect the results
Solution Approach 1:
The patent modifies the chemical parameters of the acrylic material by incorporating a specific reactive compound with dual functionality (inorganic particle affinity and organic polymerization). This parameter change allows the material to maintain ease of manufacture while becoming less sensitive to curing conditions. The reactive compound's specific chemical structure enables consistent results across different curing atmospheres by providing controlled reactivity and strong interfacial bonding.
3Strength
If the protective layer is made stronger, then mechanical strength is improved, but electrical characteristics decrease due to charge distribution
Solution Approach 1:
The reactive compound acts as an intermediary that prevents charge distribution between the inorganic particles and organic binder. By creating a well-defined interface with appropriate energy levels and electron transfer characteristics, the intermediary prevents charge trapping and maintains electrical characteristics while allowing the inorganic particles to provide mechanical strength enhancement.
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
This configuration prevents scratches and image defects, such as ghosting, while maintaining high image quality and mechanical strength, even after repeated use, by improving the compatibility and adhesiveness between organic and inorganic materials.
Implementation Method 1
an outermost surface layer includes a cured film of a composition containing inorganic particles having polymerizable groups
Implementation Method 2
F represents a charge transporting skeleton
Data Source
AI summary
Provided is an electrophotographic photoreceptor including a conductive substrate and a photosensitive layer provided on the conductive substrate, wherein an outermost surface layer includes a cured film of a composition containing inorganic particles having polymerizable groups and at least one selected from the reactive compounds represented by the following formulae (I) and (II):wherein F represents a charge transporting skeleton; L represents a divalent linking group; and m represents an integer of 1 to 8,wherein F represents a charge transporting skeleton; L′ represents an (n+1)-valent linking group; m′ represents an integer of 1 to 6; and n represents an integer of 2 to 3.