Electrophotographic Belt Surface Layer for Anti-Adhesion Roughness
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Solution Overview
Problem
Existing electrophotographic belts face issues with adhesion to other members due to excessively smooth surfaces, leading to instability in rotation and image transfer deviations, which conventional methods using PFAS-related salts struggle to address effectively.
Innovation Solution
A surface layer is formed using heteroaggregates of chain-like inorganic oxide particles and conductive metal oxide particles, facilitated by specific organic cations and non-PFAS anions, to create a rough surface with an arithmetic mean height of 0.1 to 0.7 μm, preventing adhesion and ensuring stable rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the surface of the electrophotographic belt is made smooth, then image transfer quality is improved, but adhesion to other members occurs causing rotation instability
Solution Approach 1:
The invention applies local quality by creating a surface layer with heterogeneous particle distribution where inorganic oxide particles (10-30 nm) and conductive metal oxide particles (5-40 nm) are heteroaggregated on the belt surface. This localized particle arrangement creates micro-roughness (Sa = 0.1 to 0.7 μm) that prevents adhesion while maintaining overall surface functionality for image transfer.
Solution Approach 2:
The invention uses composite materials by combining inorganic oxide particles and conductive metal oxide particles in a surface layer on the electrophotographic belt. This composite structure provides both the roughness needed to prevent adhesion and the conductive properties necessary for electrophotographic operation, resolving the contradiction between smooth surface requirements and adhesion prevention.
2Reliability
If PFAS-related salts are used to roughen the surface, then adhesion is prevented, but environmental restrictions and health concerns arise
Solution Approach 1:
The invention applies parameter changes by replacing PFAS-related salts with non-PFAS alternatives (such as carboxylic acid salts, sulfonic acid salts, or phosphoric acid salts) while maintaining the same functional effect of heteroaggregation. This substitution changes the chemical composition parameter to eliminate harmful substances while preserving the adhesion prevention capability through the same physical mechanism of surface roughening.
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 effectively restricts adhesion to other members, stabilizes belt rotation, and enables high-quality image formation by maintaining consistent moving speeds and reducing transfer deviations.
Implementation Method 1
a curable composition containing the inorganic oxide particles, the conductive metal oxide particles, acrylic monomers, and a solvent is applied onto the base layer, and in a step of drying the solvent in the curable composition, alkali metal ions in the base layer are transferred to the surface layer to cause heteroaggregation
Implementation Method 2
in a step of drying the solvent in the curable composition, alkali metal ions in the base layer are transferred to the surface layer
Data Source
AI summary
An electrophotographic member having a base layer and a surface layer in direct contact with the base layer is provided, in which the surface layer contains heteroaggregates of first particles and second particles different from the first particles, the first particles are chain-like inorganic oxide particles, the second particles contain a conductive metal oxide, the number-average particle diameter of primary particles is 5 to 40 nm, the surface layer has protruded portions derived from the heteroaggregates on an outer surface thereof opposite to a surface that faces the base layer, an arithmetic mean height (Sa) of the outer surface is 0.1 to 0.7 μm, and the base layer contains specific cations and anions.