Electrophotographic Photoreceptor Surface Layer Composition
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Solution Overview
Problem
Electrophotographic photoreceptors face challenges in achieving both high electrical characteristics and mechanical strength, particularly in maintaining image quality and extending the photoreceptor's lifetime, due to issues with the outermost surface layer's durability and resistance to wear and tear.
Innovation Solution
The electrophotographic photoreceptor incorporates a polymerized or crosslinked outermost surface layer composed of specific reactive group-containing charge transporting materials and non-reactive charge transporting materials, with a controlled content of unreacted reactive compounds, to enhance both electrical performance and mechanical strength, and includes resin particles for improved surface smoothness and abrasion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a protective layer is provided on the surface of an electrophotographic photoreceptor to improve mechanical strength, then the lifetime and reliability are improved, but the electrical characteristics and image quality may deteriorate
Solution Approach 1:
The outermost surface layer is formed as a composite material containing both reactive compounds (formula I or II) that provide mechanical strength through polymerization/crosslinking, and non-reactive charge transporting materials that maintain electrical characteristics. This composite structure resolves the contradiction by combining materials with complementary properties - the reactive components form a strong protective network while the non-reactive charge transporting materials ensure proper charge transport function.
Solution Approach 2:
The invention optimizes specific parameters: the content of non-reactive charge transporting material is controlled at 5-40% by weight, and the unreacted reactive compound content is limited to 3% by weight or less. These parameter optimizations ensure that the layer has sufficient mechanical strength from crosslinking while maintaining adequate electrical properties for photoreceptor function.
2Duration of action of stationary object
If the outermost surface layer is made thicker to improve durability and wear resistance, then the lifetime is extended, but the electrical characteristics and image quality may deteriorate
Solution Approach 1:
By using a composite material system with both reactive and non-reactive charge transporting materials, the invention achieves enhanced durability through the crosslinked protective network while the non-reactive components penetrate and maintain charge transport function throughout the layer thickness, allowing thicker layers without electrical degradation.
Solution Approach 2:
The outermost surface layer exhibits local quality differentiation where the crosslinked reactive compound network provides mechanical protection and wear resistance, while the non-reactive charge transporting materials are distributed throughout to ensure electrical function is maintained even at greater thicknesses.
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
This configuration results in an electrophotographic photoreceptor with improved electrical characteristics, mechanical strength, and extended lifetime, while maintaining high image quality even after repeated use, by balancing the distribution and reactivity of charge transporting components and incorporating resin particles for enhanced surface properties.
Implementation Method 1
an outermost surface layer which is constituted with a polymerized product or crosslinked product of a composition including at least one selected from reactive compounds represented by the formulae (I) and (II)
Implementation Method 2
a content of the non-reactive charge transporting material in the composition is from 5% by weight to 40% by weight based on the weight of the outermost surface layer
Data Source
AI summary
An electrophotographic photoreceptor includes a conductive substrate, and a photosensitive layer provided on the conductive substrate, and an outermost surface layer of the electrophotographic photoreceptor is constituted with a polymerized product or crosslinked product of a composition including at least one selected from reactive compounds represented by the formulae (I) and (II) and a non-reactive charge transporting material, a content of the non-reactive charge transporting material in the composition is from 5% by weight to 40% by weight based on the weight of the outermost surface layer, and a content of the unreacted reactive compound in the outermost surface layer after forming the outermost surface layer is 3% by weight or less based on the weight of the outermost surface layer.