Biphenyl Polyester Photoreceptor Layer for Abrasion and Ghost Control
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Solution Overview
Problem
Existing electrophotographic photoreceptors suffer from poor abrasion resistance and are prone to burn-in ghosts due to high concentrations of aromatic carboxylic acid halides in the charge transport layer or single layer type photosensitive layer, which degrade the surface potential and cause image defects.
Innovation Solution
The use of a polyester resin with a constitutional unit containing biphenyl, limiting the amount of aromatic carboxylic acid halide to 15×10 -8< mol/g or less in the charge transport layer or single layer type photosensitive layer, enhances the aggregation force and reduces burn-in ghosts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the amount of aromatic carboxylic acid halide in the charge transport layer is increased to improve charge transport performance, then charge transport efficiency is improved, but abrasion resistance deteriorates and burn-in ghosts occur
Solution Approach 1:
The patent precisely controls the amount of aromatic carboxylic acid halide to 15×10^-8 mol/g or less, changing the concentration parameter to resolve the contradiction between charge transport efficiency and abrasion resistance. This parameter optimization maintains sufficient charge transport while preventing excessive acid halide content that causes poor abrasion resistance and burn-in ghosts.
Solution Approach 2:
The patent uses a composite charge transport layer containing both the aromatic carboxylic acid halide component and a polyester resin binder. This composite structure allows the acid halide to provide charge transport functionality while the polyester resin matrix provides mechanical strength and abrasion resistance, resolving the contradiction between electrical performance and mechanical durability.
2Reliability
If the amount of aromatic carboxylic acid halide is increased to enhance charge generation, then photoconductivity is improved, but burn-in ghosts are caused due to surface potential degradation
Solution Approach 1:
The patent optimizes the concentration parameter of aromatic carboxylic acid halide to 15×10^-8 mol/g or less, which maintains adequate photoconductivity for charge generation while preventing the excessive acid halide content that leads to surface potential degradation and burn-in ghost formation.
3Device complexity
If a single layer type photosensitive layer is used to simplify structure, then device complexity is reduced, but abrasion resistance and burn-in ghost suppression become difficult to achieve
Solution Approach 1:
The patent designs a single layer type photosensitive layer that performs multiple functions simultaneously: charge generation, charge transport, and mechanical protection. By incorporating both charge transport materials and polyester resin binder in a unified layer structure, it achieves abrasion resistance and burn-in ghost suppression without requiring separate charge transport and protective layers, thus maintaining structural simplicity while improving performance.
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 photoreceptor achieves improved abrasion resistance and minimizes burn-in ghosts, ensuring high-quality image formation by maintaining the surface potential of the photosensitive layer.
Implementation Method 1
The use of a polyester resin with a constitutional unit containing biphenyl, limiting the amount of aromatic carboxylic acid halide to 15×10 -8< mol/g or less in the charge transport layer or single layer type photosensitive layer, enhances the aggregation force and reduces burn-in ghosts.
Data Source
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AI summary
An electrophotographic photoreceptor includes a conductive substrate, and a lamination type photosensitive layer disposed on the conductive substrate and including a charge generation layer and a charge transport layer, in which the charge transport layer contains a polyester resin having a constitutional unit containing biphenyl represented by Formula (1), and an amount of an aromatic carboxylic acid halide in the charge transport layer is 15×10-8 mol/g or less per unit mass of the charge transport layer, in Formula (1), j represents an integer of 0 or greater and 4 or less, j pieces of R11's each independently represent a methyl group or an ethyl group, k represents an integer of 0 or greater and 4 or less, and k pieces of R12's each independently represent a methyl group or an ethyl group.