Organic Photoreceptor Protective Layer Abrasion Resistance
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Solution Overview
Problem
Organic photoreceptors in electrophotography face issues with mechanical strength, leading to abrasion and image quality problems such as image blur and image flow, especially in high temperature and high moisture conditions, due to insufficient bonding between fillers and hardenable resins in protective layers.
Innovation Solution
A protective layer with strong bonding between γ-alumina particles treated with reactive functional groups and a hardenable compound is used, which improves mechanical strength and durability, comprising a composition formed by surface treating γ-alumina particles with a silane compound and reacting them with a hardenable resin, enhancing the anti-abrasion properties and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If colloidal silica containing hardenable siloxane resin is used for the protective layer, then mechanical strength is improved, but electric resistivity lowers causing image blur or image flow
Solution Approach 1:
The patent changes the chemical composition parameters of the protective layer by using silane-modified polyacrylonitrile instead of conventional siloxane resin, and controls the silane content within a specific range (1-50 wt% based on total resin weight) to achieve the optimal balance between mechanical strength and electric resistivity
Solution Approach 2:
The patent creates a composite protective layer combining silane-modified polyacrylonitrile resin with colloidal silica particles, where the silane modification provides both mechanical reinforcement and controlled electrical properties, resolving the contradiction between strength and resistivity
2Strength
If hardenable resin obtained by photo polymerizing compound having acryloyl group is used for protective layer, then mechanical strength is improved, but bonding between filler and resin is weak resulting in insufficient mechanical strength
Solution Approach 1:
The patent introduces silane modification as an intermediary chemical group that bridges the gap between inorganic colloidal silica particles and organic polyacrylonitrile resin, creating strong interfacial bonding through siloxane bonds that prevent filler aggregation and improve overall mechanical strength
Solution Approach 2:
The patent modifies the chemical structure of polyacrylonitrile by introducing silane groups, changing it from a simple organic polymer to a silane-modified composite material that can form strong bonds with inorganic fillers while maintaining the desired mechanical properties
3Reliability
If trigonal α-alumina particles are incorporated in the protective layer, then image blur is improved, but bonding between alumina particles and hardenable resin is weak causing cleaning deficiency
Solution Approach 1:
The patent changes the filler material from trigonal α-alumina to colloidal silica particles with controlled size distribution (Dv10: 0.01-0.1 μm, Dv50: 0.05-0.5 μm, Dv90: 0.1-5 μm), and combines this with silane-modified resin to achieve both image quality improvement and strong bonding
Solution Approach 2:
The patent creates a composite system combining silane-modified polyacrylonitrile resin with colloidal silica particles of specific size distribution, where the silane modification ensures strong interfacial bonding while the optimized particle size distribution prevents aggregation and maintains cleaning performance
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 significantly enhances the photoreceptor's surface strength against abrasion, reduces wastage thickness, and minimizes image blur and black spots, even under harsh environmental conditions, resulting in improved durability and image quality.
Implementation Method 1
a protective layer with strong bonding between γ-alumina particles treated with reactive functional groups and a hardenable compound
Implementation Method 2
hardenable resin, comprising a composition formed by surface treating γ-alumina particles with a silane compound and reacting them with a hardenable resin
Data Source
AI summary
Disclosed is an organic photoreceptor, which is composed of a photosensitive layer and a protective layer, provided on an electric conductive support, and the protective layer contains a composition obtained by hardening reaction of γ-alumina particles treated with a compound having a reactive functional group with a hardenable compound. A manufacturing method thereof is also disclosed.