Binderless Overcoat Layer for Photoreceptor Residual Potential
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Solution Overview
Problem
Current long-life overcoat layers in photoreceptors experience high residual potential and poor electrical performance due to low mobility of charge transport molecules, requiring significant changes in the thickness of charge generation and transport layers, which leads to negative effects like increased cost and light shock.
Innovation Solution
A binderless overcoat layer is introduced, composed of an alcohol-soluble charge transport molecule, a melamine formaldehyde crosslinking agent, and an acid catalyst, which provides improved electrical performance with minimal impact on the underlying layers, eliminating the need for thickness modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If conventional overcoat layers are used to provide long service life, then wear resistance is improved, but residual potential increases and electrical performance deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the overcoat layer by using specific charge transport molecules (compounds 1-10) with optimized molecular structures. This allows achieving both long service life and low residual potential through molecular design rather than thickness adjustment.
Solution Approach 2:
The patent creates a composite overcoat layer combining charge transport molecules with specific functional groups (compounds 1-10) that work synergistically to provide both mechanical durability and electrical performance, resolving the contradiction between wear resistance and electrical characteristics.
2Reliability
If thickness of charge generation and transport layers is increased to compensate for poor electrical performance, then electrical performance may improve, but manufacturing cost increases and light shock occurs
Solution Approach 1:
The patent optimizes the thickness parameter of the overcoat layer to 1-10 μm, which is significantly thinner than conventional overcoat layers. This thickness optimization, combined with improved molecular composition, achieves good electrical performance without increasing manufacturing cost or causing light shock.
Solution Approach 2:
The patent applies a thin overcoat layer with specialized charge transport molecules only where needed for electrical performance improvement, rather than increasing the thickness of entire imaging layers. This localized approach avoids unnecessary material costs and light shock issues.
3Reliability
If thickness of imaging layers is increased to improve electrical performance, then charge transport may improve, but light shock increases
Solution Approach 1:
The patent reduces the overcoat layer thickness to 1-10 μm and optimizes the molecular structure of charge transport molecules to enhance charge transport efficiency. This allows achieving good electrical performance with a thin layer that does not cause light shock during the imaging process.
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 binderless overcoat layer achieves long service life with low residual potential and improved electrical cyclic stability, matching the performance of conventional overcoat layers while reducing wear rate and light sensitivity, thus enhancing overall photoreceptor performance.
Implementation Method 1
a melamine formaldehyde crosslinking agent, and an acid catalyst
Implementation Method 2
a melamine formaldehyde crosslinking agent, and an acid catalyst
Data Source
AI summary
Embodiments pertain to a novel imaging member, namely, an imaging member or photoreceptor comprising a binderless overcoat layer which exhibits substantially improved electrical performance, such as low residual potential and good electrical cyclic stability. The overcoat layer of the present embodiments is formed from a formulation comprising a small transport molecule, a crosslinking agent, an acid catalyst and a solvent.