Undercoat Layer Moisture Resistance via Organic Acid Metal Salt
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Solution Overview
Problem
Existing electrophotographic photosensitive members experience significant variations in light potential due to increased moisture absorption under high temperature and high humidity conditions, leading to increased resistance and image defects, which are not adequately addressed by existing technologies.
Innovation Solution
An electrophotographic photosensitive member is developed with an undercoat layer containing metal oxide particles treated with a silane coupling agent and an organic acid metal salt, such as zinc octylate, which reduces moisture absorption and maintains consistent light potential across different environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If metal oxide particles are surface-treated with a silane coupling agent to prevent image defects, then image quality is improved, but the resistance of the undercoat layer increases and light potential varies significantly in repeating use under high temperature and high humidity
Solution Approach 1:
The patent applies composite materials by combining metal oxide particles (such as zinc oxide, titanium oxide, or silicon oxide) with a specific organic acid metal salt (having at least one metal element selected from bismuth, zinc, cobalt, iron, nickel, or copper) in the undercoat layer. This composite formulation creates a synergistic effect where the organic acid metal salt modifies the electrical properties of the metal oxide particles, preventing both image defects and light potential variation under high temperature and high humidity conditions.
Solution Approach 2:
The patent changes the chemical composition parameters of the undercoat layer by introducing an organic acid metal salt with specific metal elements (bismuth, zinc, cobalt, iron, nickel, or copper). This parameter change alters the electrical characteristics and moisture resistance of the undercoat layer, enabling it to maintain stable light potential in repeating use under high temperature and high humidity while still preventing charge injection-induced image defects.
2Reliability
If the concentration of silane coupling agent is increased to prevent light potential variation under ordinary conditions, then light potential stability under ordinary temperature and humidity is improved, but the difference in light potential variation between ordinary and high temperature/high humidity environments increases
Solution Approach 1:
The patent introduces a new chemical parameter (organic acid metal salt with specific metal elements) that fundamentally changes the environmental adaptability of the undercoat layer. This parameter change enables the undercoat layer to maintain consistent light potential stability across both ordinary and high temperature/high humidity conditions, rather than merely optimizing for ordinary conditions.
Solution Approach 2:
The organic acid metal salt provides multi-functionality to the undercoat layer, enabling it to simultaneously prevent charge injection (image defects) and maintain stable light potential under varying environmental conditions (both ordinary and high temperature/high humidity). This universal performance eliminates the need for condition-specific formulations.
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 proposed solution effectively minimizes the variation in light potential between ordinary and high temperature/high humidity environments, enhancing the stability and performance of the electrophotographic photosensitive member.
Implementation Method 1
The metal oxide particles are surface-treated with a silane coupling agent for preventing image defects of black spots due to charge injection from the support to the photosensitive layer
Implementation Method 2
the requirement for a reduction in variation of light potential of an electrophotographic photosensitive member in repeating use has been increased than ever before in association with speed-up (acceleration of process speed) of electrophotographic apparatuses
Data Source
AI summary
The present invention relates to an electrophotographic photosensitive member including an undercoat layer containing metal oxide particles, a binder resin, and an organic acid metal salt having at least one metal element selected from the group consisting of bismuth, zinc, cobalt, iron, nickel, and copper.