Photoreceptor Polyester Layer for Uniform Potential and Wear Resistance
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Solution Overview
Problem
Existing electrophotographic photoreceptors face issues with non-uniform potential distribution on their surface and susceptibility to uneven wear.
Innovation Solution
The photoreceptor incorporates a charge transport layer containing a polyester resin with a specific molecular weight range (50,000 ≤ Mw ≤ 200,000) and a molecular weight distribution ratio (4.0 < Mw/Mn < 6.0) to enhance uniformity in potential distribution and resistance to wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional charge transport layer is used, then the photoreceptor can perform basic charge transport, but the potential distribution on the surface becomes non-uniform and wear resistance decreases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the molecular weight (Mw) of the polyester resin within 50,000-200,000 and the molecular weight distribution ratio (Mw/Mn) between 4.0 and 6.0. These specific parameter ranges optimize both the uniformity of potential distribution and wear resistance of the charge transport layer, resolving the technical contradiction between manufacturing precision and reliability.
Solution Approach 2:
The patent uses a composite material approach by formulating the charge transport layer with a specific composition: polyester resin (50,000-200,000 Mw, 4.0<Mw/Mn<6.0), charge-transporting material, and solvent. This composite formulation achieves both uniform potential distribution and enhanced wear resistance simultaneously, addressing the contradiction between manufacturing precision and reliability.
2Manufacturing precision
If the molecular weight of polyester resin is not controlled within specific range, then manufacturing is easier, but surface uniformity and wear resistance deteriorate
Solution Approach 1:
The patent establishes specific parameter ranges for polyester resin molecular weight (50,000-200,000) and molecular weight distribution ratio (4.0<Mw/Mn<6.0) to achieve optimal surface uniformity and wear resistance. While these constraints increase manufacturing complexity, they ensure consistent high-quality results by controlling the polymerization process within defined boundaries.
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
This configuration results in improved surface uniformity and increased resistance to wear, ensuring consistent performance of the photoreceptor.
Implementation Method 1
a multilayer-type photosensitive layer that is disposed on the conductive substrate and has a charge generation layer and a charge transport layer
Implementation Method 2
the charge transport layer contains a charge-transporting material and a polyester resin (1), and the polyester resin (1) contained in the charge transport layer satisfies 50,000≤Mw≤200,000 and 4.0
Data Source
AI summary
An electrophotographic photoreceptor includes: a conductive substrate; and a multilayer-type photosensitive layer that is disposed on the conductive substrate and has a charge generation layer and a charge transport layer. The charge transport layer contains a charge-transporting material and a polyester resin (1) having a dicarboxylic acid unit (A) represented by formula (A) and a diol unit (B) represented by formula (B). The polyester resin (1) contained in the charge transport layer satisfies 50,000≤Mw≤200,000 and 4.0<Mw/Mn<6.0, wherein Mw is a weight average molecular weight of the polyester resin (1), and Mn is a number average molecular weight of the polyester resin (1).In formula (A), ArA1 and ArA2 are each independently an optionally substituted aromatic ring, LA is a single bond or a divalent linking group, and nA1 is 0, 1, or 2. In formula (B), ArB1 and ArB2 are each independently an optionally substituted aromatic ring, LB is a single bond, an oxygen atom, a sulfur atom, or —C(Rb1)(Rb2)—, and nB1 is 0, 1, or 2, and Rb1 and Rb2 are each independently a hydrogen atom, a C1-C20 alkyl group, a C6-C12 aryl group, or a C7-C20 aralkyl group, and Rb1 and Rb2 taken together may form a cyclic alkyl group.