Charging Member Ion-Conductive Agent Bleeding Suppression
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Solution Overview
Problem
Existing charging members for electrophotographic apparatuses suffer from image defects due to bleeding of ion-conductive agents, which is not adequately suppressed by cations with two aryl groups, leading to suboptimal chargeability.
Innovation Solution
A charging member with a base layer composed of a cross-linked conductive rubber composition containing a cross-linkable rubber, a cross-linking agent, a specified ion-conductive agent represented by a specific general formula, and carbon black, where the ion-conductive agent is easily dissociated and adsorbed by carbon black, preventing bleeding and maintaining excellent chargeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cation with two aryl groups is used in the base layer, then the ion-conductive agent is fixed and bleeding is suppressed, but image defects still occur due to insufficient bonding with cross-linked base polymer
Solution Approach 1:
The patent changes the chemical structure parameters of the cation by introducing a bicyclic structure with two bridgehead carbons and specific substituent patterns (Formula 1). This structural parameter change enables the cation to form stable bonds with cross-linked base polymers while maintaining ion conductivity, thereby suppressing bleeding without causing image defects.
Solution Approach 2:
The patent creates a composite base layer material combining cross-linked base polymer with specifically structured cations (Formula 1) and ion-conductive agents. This composite structure leverages the cross-linked polymer network for mechanical stability and the specialized cation structure for both bonding and ion conduction, achieving both bleeding suppression and image quality maintenance.
2Stability of the object's composition
If the base polymer is cross-linked to improve stability, then the structure becomes more stable, but the cation cannot form bonds with the base polymer, leading to ion-conductive agent bleeding
Solution Approach 1:
The patent modifies the cation structure parameters to include a bicyclic framework with bridgehead carbons that can form stable bonds with cross-linked base polymers. This parameter change allows the cation to accommodate the cross-linked polymer structure while maintaining bonding capability, thus preventing bleeding in stable cross-linked base layers.
Solution Approach 2:
The specially structured cation (Formula 1) acts as an intermediary between the cross-linked base polymer and the ion-conductive agent. It forms stable bonds with the cross-linked polymer network while simultaneously providing ion conduction pathways, thereby mediating between structural stability requirements and ion retention requirements.
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 suppresses image defects caused by ion-conductive agent bleeding and enhances chargeability by ensuring the ion-conductive agent is fixed within the polymer skeleton and adsorbed by carbon black, achieving a balance between conductivity and bleeding prevention.
Implementation Method 1
the base layer is a cross-linked body of a conductive rubber composition containing (a) a cross-linkable rubber, (b) a cross-linking agent
Implementation Method 2
the ion-conductive agent is easily dissociated and adsorbed by carbon black, preventing bleeding
Data Source
AI summary
A charging member for an electrophotographic apparatus in which image defects caused by bleeding of an ion-conductive agent are suppressed and excellent chargeability can be maintained. In a charging member for an electrophotographic apparatus including a base layer composed of a conductive rubber elastomer and a surface layer, the base layer is a cross-linked body of a conductive rubber composition containing (a) a cross-linkable rubber, (b) a cross-linking agent, (c) an ion-conductive agent represented by a general formula (1) below, and (d) carbon black. Here, R1 and R2 are allyl groups, R3 is a methyl group or an ethyl group, and R4 is a linear alkyl group having a carbon number of 6-8. X− is a sulfonate anion having a fluorine atom or a bis(sulfonyl) imide anion having a fluorine atom.