Charge Transport Layer Resin Compatibility for Photoreceptor Stability
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Solution Overview
Problem
Existing electrophotographic photoreceptors face challenges in maintaining image quality stability due to inadequate compatibility between main resins and lubricating resins, leading to insufficient lubricity and degradation of abrasion resistance and electrical properties.
Innovation Solution
Incorporating a resin (X) with a siloxane or long-chain alkyl structure into the charge transport layer, which has a mass proportion of 0.5% to 30% and an average thickness of 30 μm to 50 μm, improving compatibility and maintaining the original lubricating function while enhancing film hardness and dispersibility of charge transport materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mass proportion of resin (X) is less than 0.5% or greater than 30%, then the compatibility between main resins and lubricating resins is insufficient, but the lubricity and abrasion resistance are degraded
Solution Approach 1:
The patent applies parameter changes by precisely controlling the mass proportion of resin (X) within 0.5-30% and the layer thickness within 30-50 μm. This quantitative parameter optimization ensures sufficient compatibility between main resins and lubricating resins while maintaining adequate lubricity and abrasion resistance, thereby improving image quality stability.
2Strength
If the charge transport layer thickness is increased to improve abrasion resistance, then the lubricity may be insufficient, but the electrical properties are degraded
Solution Approach 1:
The patent optimizes the thickness parameter of the charge transport layer to be within 30-50 μm. This parameter control ensures that the layer is thick enough to provide adequate abrasion resistance while remaining thin enough to maintain sufficient lubricity and electrical properties, resolving the contradiction between mechanical strength and electrical performance.
Data Source
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 charge transport material, at least one of a polyester resin (PEz) or a polycarbonate resin (PCz) that has at least one of a structure (Z1) represented by Formula (Z1) or a structure (Z2) represented by Formula (Z2) at at least one terminal, and a resin (X) that has at least one of a unit (X1) represented by Formula (X1) or a unit (X2) represented by Formula (X2), a mass proportion of the resin (X) in a total amount of the polyester resin (PEz), the polycarbonate resin (PCz), and the resin (X) in the charge transport layer is 0.5% by mass or greater and 30% by mass or less, and the charge transport layer has an average thickness of greater than 30 μm and less than 50 μm,in Formula (Z1), Ar1 represents an aromatic ring that may have a substituent,in Formula (Z2), Ar2 represents an aromatic ring that may have a substituent,in Formula (X1), R101, R102, and R103 each independently represent a hydrogen atom or an alkyl group having 1 or more and 5 or less carbon atoms, L101 represents a single bond, an alkylene group having 1 or more and 5 or less carbon atoms, —O—, —C(═O)—, —C(═O)O—, an aromatic ring that may have a substituent, or a combination thereof, L102 represents a single bond, an alkylene group having 1 or more and 5 or less carbon atoms, —O—, —C(═O)—, —C(═O)O—, or a combination thereof, R104 and R105 each independently represent an alkyl group having 1 or more and 5 or less carbon atoms, n represents an integer of 0 or greater and 300 or less, R106, R107, and R108 each independently represent an alkyl group having 1 or more and 5 or less carbon atoms or —O—[Si(R109)(R110)O]m—Si(R111)(R112)(R113), R109, R110, R111, R12, and R113 each independently represent an alkyl group having 1 or more and 5 or less carbon atoms, and m represents an integer of 0 or greater and 20 or less,in Formula (X2), R201, R202, and R203 each independently represent a hydrogen atom or an alkyl group having 1 or more and 5 or less carbon atoms, L201 represents a single bond, an alkylene group having 1 or more and 5 or less carbon atoms, —O—, —C(═O)—, —C(═O)O—, an aromatic ring that may have a substituent, or a combination thereof, L202 represents a single bond, an alkylene group having 1 or more and 5 or less carbon atoms, —O—, —C(═O)—, —C(═O)O—, or a combination thereof, and R204 is an alkyl group having 6 or more and 30 or less carbon atoms.