Organic Photoreceptor Protection Layer Hardness
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Solution Overview
Problem
Existing organic photoreceptors face challenges with abrasion resistance and scratch resistance due to surface wear, particularly when exposed to shortwave laser light, which affects image quality and durability in high-speed printing applications.
Innovation Solution
Incorporating a protection layer with a charge transport substance, a curable resin component, tin oxide treated with a reactive organic group, and silica particles on an electroconductive substrate, enhancing surface hardness and resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protection layer is added to improve abrasion resistance, then surface wear is reduced, but residual potential and image memory issues may occur
Solution Approach 1:
The patent applies local quality by using silica particles with specific properties (surface treatment, size distribution) in the protection layer to achieve both abrasion resistance and low residual potential. The silica particles are specifically treated with silane coupling agents and have controlled surface charge to locally improve surface properties without generating harmful effects.
Solution Approach 2:
The patent changes parameters of the protection layer by controlling silica particle characteristics (surface treatment, size, concentration) and resin composition to achieve the optimal balance between abrasion resistance and electrical properties. By adjusting these parameters, the protection layer achieves low residual potential while maintaining high abrasion resistance.
2Strength
If the surface layer is made harder to improve scratch resistance, then surface durability is enhanced, but image quality may deteriorate
Solution Approach 1:
The patent uses composite materials by combining silica particles with specific resin components in the protection layer. This composite structure provides both the hardness needed for scratch resistance and the optical properties required for image quality, as the silica particles are dispersed in a resin matrix that maintains optical clarity.
Solution Approach 2:
The protection layer is designed with local quality by ensuring uniform dispersion of silica particles and optimizing their surface properties to achieve localized hardness where needed while maintaining overall optical transparency and electrical properties for image formation.
3Reliability
If a protection layer with charge transport compound is added to prevent surface wear, then abrasion resistance improves slightly, but the effect is limited and surface hardness does not increase sufficiently
Solution Approach 1:
The patent creates a composite protection layer combining silica particles (for hardness) with charge transport compounds and resin components. This composite structure synergistically provides both high surface hardness for abrasion resistance and the charge transport functionality needed for photoreceptor operation.
Solution Approach 2:
The patent changes the physical and chemical parameters of the protection layer by incorporating silica particles with controlled size distribution and surface treatment, adjusting the resin composition and curing conditions to achieve sufficient surface hardness while maintaining charge transport properties.
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 significantly improves abrasion resistance and scratch resistance, reduces residual potential and image memory issues, ensuring stable high-quality image formation over time.
Implementation Method 1
a resin component obtained by curing a curable compound
Implementation Method 2
the surface hardness of a protection layer could be increased by adding a silica particle in a protection layer
Implementation Method 3
the protection layer comprises a charge transport substance represented by the following general formula (1)
Data Source
AI summary
The invention provides a means for improving the abrasion resistance and the scratch resistance of a protection layer by increasing the surface hardness of the protection layer of an organic photoreceptor. The invention is an organic photoreceptor constituted by laminating on an electroconductive substrate, a photosensitive layer and a protection layer successively, wherein the protection layer comprises a charge transport substance represented by the following general formula (1), a resin component obtained by curing a curable compound and tin oxide treated with a surface preparation agent having a reactive organic group, and a silica particle:in the general formula (1), R1 and R2 are each independently hydrogen atoms or methyl groups, and R3 is a straight-chain or branched alkyl group having 1 to 5 carbon atoms.