Photosensitive Layer Polyester Resin Withstand Voltage
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Solution Overview
Problem
Electrophotographic photosensitive members experience local dielectric breakdown under high-temperature and high-humidity conditions, leading to dot-shaped image defects due to insufficient photosensitive layer withstand voltage, and excessive addition of polyester resin impairs sensitivity.
Innovation Solution
Incorporating a specific amount of a polyester resin with a particular repeating unit structure in the photosensitive layer, within a mass percentage range of 0.3% to 7.0%, enhances photosensitive layer withstand voltage under high-temperature conditions while maintaining sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyester resin is added to the photosensitive layer, then photosensitive layer withstand voltage is improved, but sensitivity is impaired
Solution Approach 1:
The patent applies parameter changes by precisely controlling the content percentage of polyester resin in the photosensitive layer to be 0.3-7.0% by mass, and by modifying the chemical structure of polyester resin through specific repeating units (formula 1 and formula 2). This optimization resolves the contradiction by finding the optimal parameter range where withstand voltage is improved while sensitivity is maintained.
Solution Approach 2:
The patent uses composite materials by combining polyester resin with specific repeating units (formula 1 and formula 2) with other photosensitive layer components (charge generating material, hole transport material, electron transport material). This composite approach allows the polyester resin to enhance withstand voltage while the overall composition maintains sensitivity through balanced material selection.
2Reliability
If polyester resin content is increased to improve withstand voltage, then reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent resolves this contradiction by establishing a specific parameter range (0.3-7.0% by mass) for polyester resin content. This parameter optimization simplifies the composition formulation process while ensuring adequate withstand voltage, avoiding the need for complex multi-component systems.
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 prevents dot-shaped image defects under high-temperature and high-humidity conditions while ensuring excellent sensitivity, as demonstrated by the photosensitive members with improved withstand voltage and reduced image defects.
Implementation Method 1
electrophotographic photosensitive members experience local dielectric breakdown under high-temperature and high-humidity conditions, leading to dot-shaped image defects due to insufficient photosensitive layer withstand voltage
Implementation Method 2
The photosensitive layer contains a charge generating material, a binder resin, a hole transport material, and an electron transport material
Data Source
AI summary
An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer of a single layer. The photosensitive layer contains a charge generating material, a binder resin, a hole transport material, and an electron transport material. The binder resin includes a polyester resin. The polyester resin includes a first repeating unit represented by general formula (1) shown below and a second repeating unit represented by general formula (2) shown below.A content percentage of the polyester resin in the photosensitive layer is at least 0.3% by mass and no greater than 7.0% by mass.