Electrophotographic Photoreceptor Surface Layer Fluorine Polymer Bleeding
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Solution Overview
Problem
The degradation of charge retention characteristics in electrophotographic photoreceptors due to the bleeding of fluorine-based graft polymer from the outer surface layer, which affects the cleanability and performance of the photoreceptor.
Innovation Solution
An electrophotographic photoreceptor with a conductive substrate and a photosensitive layer, where the outermost surface layer contains fluorine-containing resin particles and a fluorine-based graft polymer with a fluorinated alkyl group, and the ratio of separated fluorine-based graft polymer to the total amount in the surface layer is controlled to be 15% or less, thereby suppressing the bleeding and enhancing charge retention and cleanability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If fluorine-based graft polymer is used as dispersant in the surface layer, then dispersibility of fluorine-containing resin particles is enhanced, but charge retention characteristics deteriorate due to bleeding on the outer surface
Solution Approach 1:
The patent changes the chemical structure parameter of the graft polymer by specifying it must have a fluorinated alkyl group, which fundamentally alters its interaction properties with both the fluorine-containing resin particles and the photoreceptor surface, thereby reducing bleeding while maintaining dispersibility
Solution Approach 2:
The patent creates a composite surface layer structure where fluorine-containing resin particles are dispersed within a matrix containing the fluorine-based graft polymer with fluorinated alkyl group, forming a composite material system that achieves both good dispersibility and suppressed bleeding
2Ease of operation
If fluorine-containing resin particles are blended in the surface layer, then cleanability is enhanced, but charge retention characteristics deteriorate due to bleeding of fluorine-based graft polymer
Solution Approach 1:
The patent modifies the chemical composition parameter of the surface layer by specifying the graft polymer must contain fluorinated alkyl group, which changes the surface energy and adhesion properties, enabling good cleanability while preventing polymer bleeding that would harm charge retention
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 controlled ratio of fluorine-based graft polymer in the outermost surface layer stabilizes the surface texture, improves cleanability, and maintains good charge retention characteristics, ensuring effective performance of the photoreceptor.
Implementation Method 1
a fluorine-based graft polymer having a fluorinated alkyl group... A ratio of an amount of a fluorine-based graft polymer separated from the fluorine-containing resin particle to a total amount of the fluorine-based graft polymer in the outermost surface layer is 15% or less
Data Source
AI summary
An electrophotographic photoreceptor includes a conductive substrate and a photosensitive layer disposed on the conductive substrate. An outermost surface layer of the electrophotographic photoreceptor contains a fluorine-containing resin particle and a fluorine-based graft polymer having a fluorinated alkyl group. A ratio of an amount of a fluorine-based graft polymer separated from the fluorine-containing resin particle to a total amount of the fluorine-based graft polymer in the outermost surface layer is 15% or less.