Electrophotographic Photosensitive Member Surface Layer Dispersion
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Solution Overview
Problem
Existing electrophotographic photosensitive members face issues with image defects due to insufficient dispersion of fluorine atom-containing resin particles and potential fluctuations, especially in high-temperature and high-humidity environments, which affect their mechanical durability and image quality.
Innovation Solution
Incorporating a surface layer with fluorine atom-containing resin particles, a binder material, and a polymer A having a specific structural unit represented by the formula (1), where the sum of the number of carbon atoms in Rf1 and Rf2 is 6 or more, to enhance dispersibility and suppress potential fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a fluorine atom-containing resin particle is incorporated into the surface layer to enhance abrasion resistance, then the friction between the surface layer and contact member is reduced, but the dispersibility of the resin particle deteriorates and potential fluctuation occurs
Solution Approach 1:
A fluorine-containing polymer is introduced as an intermediary substance between the fluorine atom-containing resin particle and the binder material. This polymer acts as a bridge that is compatible with both the fluorine resin particle (providing surface compatibility) and the binder material (providing adhesion), thereby achieving both good dispersibility and abrasion resistance without potential fluctuation
Solution Approach 2:
The surface layer is constructed as a composite material system containing the fluorine atom-containing resin particle, the fluorine-containing polymer, and the binder material. This composite structure allows the fluorine resin particle to provide abrasion resistance while the polymer matrix maintains dispersibility and electrical stability
2Duration of action of stationary object
If the fluorine atom-containing resin particle is used to improve mechanical durability, then the friction is reduced, but the potential fluctuation at repeated use increases
Solution Approach 1:
The fluorine-containing polymer serves as a mediator that connects the fluorine resin particle to the binder material system, providing a stable interface that prevents charge accumulation and potential fluctuation during repeated use while maintaining the mechanical durability benefits of the fluorine resin particle
Solution Approach 2:
The invention changes the chemical and physical parameters of the surface layer by introducing the fluorine-containing polymer with specific properties (fluorine content, molecular weight, functional groups) to control the electrical and mechanical characteristics, thereby stabilizing the potential while maintaining mechanical durability
Data Source
AI summary
The present disclosure provides an electrophotographic photosensitive member having a surface layer that is excellent in dispersibility of a fluorine atom-containing resin particle and suppresses a potential fluctuation at the time of repeated use. The electrophotographic photosensitive member having the surface layer, wherein the surface layer includes the fluorine atom-containing resin particle, a binder material, and a polymer A having a specific structural unit.