Polyarylate Resin Photosensitive Layer Scratch Resistance
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Solution Overview
Problem
Electrophotographic photosensitive members face challenges in achieving optimal scratch resistance and anti-fogging properties, particularly in image forming apparatuses where residual components can cause image defects.
Innovation Solution
A single-layer electrophotographic photosensitive member is developed with a conductive substrate and a photosensitive layer containing a charge generating material, hole transport material, electron transport material, and a binder resin, specifically a polyarylate resin with a defined chemical structure, which provides a scratch resistance depth of no greater than 0.50 μm and a Vickers hardness of at least 17.0 HV, enhancing anti-fogging properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional photosensitive members are used, then basic electrophotographic function is maintained, but scratch resistance is insufficient and image defects occur due to residual component adhesion
Solution Approach 1:
The invention changes the chemical composition parameters of the binder resin by incorporating specific polyarylate resins with defined structural formulas (1) and (2), controlling the ratios of repeating units (where s/(s+u) is 0.05-0.70). This parameter optimization achieves scratch resistance depth of 0.50 μm or less while maintaining anti-fogging properties, resolving the contradiction between scratch resistance and residual component adhesion.
Solution Approach 2:
The invention uses a composite binder resin system combining polyarylate resins with specific structural characteristics. The composite structure integrates multiple repeating units with different properties (represented by formulas 1 and 2 with controlled ratios), achieving both mechanical strength for scratch resistance and surface properties for preventing residual component adhesion.
2Strength
If photosensitive layer hardness is increased to improve scratch resistance, then scratch resistance improves, but manufacturing complexity increases due to precise composition control requirements
Solution Approach 1:
The invention simplifies composition control by defining specific parameter ranges for the polyarylate resin structure. By controlling the ratio parameter s/(s+u) within 0.05-0.70 and using well-defined structural formulas, the patent achieves scratch resistance depth of 0.50 μm or less without requiring complex manufacturing processes, making the solution both effective and manufacturable.
3Object-affected harmful factors
If anti-fogging properties are enhanced to prevent residual component adhesion, then image quality improves, but scratch resistance may be compromised
Solution Approach 1:
The invention simultaneously optimizes both anti-fogging and scratch resistance by precisely controlling the chemical composition parameters of the polyarylate resin. The specific structural formulas and ratio ranges (s/(s+u) = 0.05-0.70) create a balanced material properties profile that achieves both high anti-fogging performance and scratch resistance depth of 0.50 μm or less, resolving the contradiction between these two properties.
Solution Approach 2:
The composite polyarylate resin system combines repeating units with different structural characteristics (formulas 1 and 2) in controlled ratios. This composite structure provides both the surface properties needed for anti-fogging and the mechanical strength required for scratch resistance, achieving dual functionality in a single binder resin system.
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 reduces image defects by improving scratch resistance and anti-fogging properties, ensuring reliable performance in image forming apparatuses by preventing residual components from adhering to the photosensitive member.
Implementation Method 1
The exposure device exposes the charged surface of the image bearing member to form an electrostatic latent image on the surface of the image bearing member
Implementation Method 2
The photosensitive layer has a Vickers hardness of at least 17.0 HV
Data Source
AI summary
An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer is a single-layer photosensitive layer. The photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The binder resin contains a polyarylate resin (1). The polyarylate resin is represented by general formula (1). The photosensitive layer has a scratch resistance depth of no greater than 0.50 μm. The photosensitive layer has a Vickers hardness of at least 17.0 HV.