Photoconductor Charge Transport Layer Crystallization Control
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Solution Overview
Problem
Existing photoreceptors face challenges with crystallization of charge transport components, leading to ineffective print quality in xerographic copying and printing due to crystallization of aryl amine molecules, which results in ghosting and unacceptable print quality.
Innovation Solution
Incorporating a mixture of tris(enylaryl)amine and bis(enylaryl)arylamine in the charge transport layers as additives to minimize crystallization, allowing for rapid charge transport and improved photoconductor sensitivity, while maintaining low Vr and preventing Vr cycle up.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aryl amine molecules are used as charge transport components, then charge transport function is provided, but crystallization occurs leading to ghosting and unacceptable print quality
Solution Approach 1:
The patent uses a composite charge transport layer comprising multiple aryl amine compounds with different molecular structures (TmTBD, T-651, and T-770 additives). This composite approach prevents crystallization by creating molecular heterogeneity that disrupts crystal lattice formation, while maintaining effective charge transport through the complementary properties of each component.
Solution Approach 2:
The patent modifies the chemical composition parameters of the charge transport layer by incorporating specific additives (T-651 and T-770) in controlled amounts (0.1-10 wt% and 0.01-5 wt% respectively). These parameter changes alter the molecular packing and intermolecular interactions, preventing crystallization while preserving charge transport capability.
2Stability of the object's composition
If charge transport layers are formulated to prevent crystallization, then print quality improves, but charge transport efficiency may be reduced
Solution Approach 1:
The patent optimizes the concentration parameters of charge transport components and additives to achieve a balance where crystallization is prevented but charge transport mobility is maintained. The specific ranges (TmTBD: 90-99.9 wt%, T-651: 0.1-10 wt%, T-770: 0.01-5 wt%) are determined to provide sufficient molecular spacing to prevent crystallization while maintaining adequate charge carrier mobility.
Solution Approach 2:
The composite formulation combines high-mobility TmTBD with crystallization-inhibiting additives T-651 and T-770. The dominant TmTBD phase provides the primary charge transport pathway, while the minor additive phases act as molecular spacers that prevent crystallization without significantly blocking charge transport routes.
3Reliability
If additives are incorporated to minimize crystallization, then ghosting characteristics improve, but manufacturing complexity increases
Solution Approach 1:
The patent establishes specific concentration ranges for each additive component that optimize ghosting prevention while maintaining formulation practicality. The defined ranges (T-651: 0.1-10 wt%, T-770: 0.01-5 wt%) provide a clear manufacturing target that balances performance improvement with formulation simplicity.
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 use of tris(enylaryl)amine and bis(enylaryl)arylamine additives in charge transport layers prevents crystallization, ensuring excellent ghosting characteristics and photoconductor sensitivity, resulting in improved print quality and rapid charge transport.
Implementation Method 1
Incorporating a mixture of tris(enylaryl)amine and bis(enylaryl)arylamine in the charge transport layers as additives to minimize crystallization
Implementation Method 2
a photogenerating layer, and at least one charge transport layer wherein at least one of the charge transport layers is comprised of at least one charge transport component
Data Source
AI summary
A photoconductor that includes, for example, a supporting substrate, a photogenerating layer, and a charge transport layer that includes a charge transport component, and a mixture of a bis(enylaryl)arylamine and a tris(enylaryl)amine.