Electrophotographic Photoreceptor Radical Acceptor Curing
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Solution Overview
Problem
High light emitting intensity during photocuring of electrophotographic photoreceptors can lead to damage of the photosensitive layer, particularly decomposing the hole transport material, resulting in deteriorated electrical characteristics and transfer repeatability.
Innovation Solution
Incorporating a radical acceptor compound in the photosensitive layer, with a specific energy difference between its HOMO and LUMO levels, to prevent decomposition of the hole transport material during high light exposure, ensuring a high curing degree of the protective layer and maintaining excellent electrical characteristics and transfer repeatability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high light emitting intensity is used during photocuring of the protective layer, then the curing degree of the protective layer is improved, but the hole transport material in the photosensitive layer is decomposed
Solution Approach 1:
The patent introduces a radical acceptor compound as an intermediary substance in the photosensitive layer. This compound accepts radicals generated during photocuring, preventing them from attacking and decomposing the hole transport material. The radical acceptor compound acts as a mediator that protects the hole transport material while allowing the photocuring process to proceed with high light intensity.
Solution Approach 2:
The patent converts the harmful radicals generated during high-intensity photocuring into a beneficial protective mechanism. By incorporating a radical acceptor compound, the harmful radicals are captured and converted into stable species, transforming the potential damage into a protective effect that preserves the hole transport material while maintaining high curing efficiency.
2Productivity
If high light emitting intensity is used during photocuring, then productivity is improved, but electrical characteristics are deteriorated
Solution Approach 1:
The radical acceptor compound serves as an intermediary that enables high-speed curing without compromising electrical characteristics. It captures radicals during the high-intensity photocuring process, preventing degradation of the hole transport material and thus maintaining the photoreceptor's electrical performance while achieving high productivity.
Solution Approach 2:
The patent changes the chemical composition parameters of the photosensitive layer by incorporating a radical acceptor compound with specific HOMO-LUMO energy difference (1.8-3.0 eV). This parameter change enables the system to withstand high light intensities during curing without degrading the hole transport material, thus maintaining electrical characteristics while improving curing efficiency.
3Manufacturing precision
If high light emitting intensity is used during photocuring, then the curing degree is improved, but transfer repeatability is deteriorated
Solution Approach 1:
The radical acceptor compound acts as a mediator that protects the hole transport material from radical-induced damage during high-intensity photocuring. By capturing radicals, it prevents the degradation that would otherwise compromise transfer repeatability, allowing high curing degrees to be achieved without sacrificing image transfer consistency.
Solution Approach 2:
The patent converts the potentially harmful radicals generated during high-intensity curing into a beneficial protective effect. The radical acceptor compound captures these radicals, transforming them from a source of degradation into a mechanism that preserves transfer repeatability while enabling high curing efficiency.
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 a radical acceptor compound in the photosensitive layer enhances the curing degree of the protective layer, maintaining initial electrical characteristics and improving strong exposure characteristics and transfer repeatability by preventing damage to the hole transport material.
Implementation Method 1
Incorporating a radical acceptor compound in the photosensitive layer, with a specific energy difference between its HOMO and LUMO levels, to prevent decomposition of the hole transport material during high light exposure
Implementation Method 2
a protective layer which contains a cured product obtained by curing a curable compound
Data Source
AI summary
There is provided an electrophotographic photoreceptor including: a conductive support; and a photosensitive layer and a protective layer containing a cured product obtained by curing a curable compound, which are sequentially disposed on the conductive support. An area ratio A/B is 0.0045 or less, where A is an absorbance area at a wavelength of 1647 cm−1 to 1627 cm−1 and B is an absorbance area of a peak at a wavelength of 1800 cm−1 to 1647 cm−1 in an infrared absorption spectrum measurement of the protective layer. The photosensitive layer contains at least a hole transport material (HTM) and a radical acceptor compound. The electrophotographic photoreceptor is an electrophotographic photoreceptor including a protective layer with a high curing degree and having good initial electrical characteristics, excellent strong exposure characteristics, and excellent transfer repeatability.