Polyarylate Resin Photosensitive Layer Abrasion Resistance

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Solution Overview

Problem

Existing electrophotographic photosensitive members face issues with failure due to member contact, particularly in high-temperature and high-humidity environments, and have limited abrasion resistance.

Innovation Solution

A polyarylate resin with specific repeating units, represented by formulas (1), (2), (3), and (4), is used as a binder in the photosensitive layer. The resin has a third percentage greater than 0% and less than 50% and a fourth percentage at least 35% and less than 70%, enhancing solubility and abrasion resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a conventional polyarylate resin is used in the photosensitive layer, then the structure is simple, but the abrasion resistance is insufficient and failure occurs due to member contact

Engineering Contradiction:

Improveabrasion resistanceVSAvoidresin structure complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The patent uses a composite polyarylate resin comprising multiple specific repeating units (formulas 1-4) with controlled ratios. This composite structure combines different functional units to achieve enhanced abrasion resistance and prevention of member contact failure, while maintaining processability through specific compositional ratios.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent optimizes the compositional parameters of the polyarylate resin by controlling the ratios of different repeating units. Specifically, the third percentage (repeating unit 3) is kept at >0% and <50%, and the fourth percentage (repeating unit 4) is kept at ≥35% and <70%. These parameter optimizations balance abrasion resistance, member contact resistance, and solubility.

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If the photosensitive layer has high solubility, then the coating process is easy, but the abrasion resistance decreases

Engineering Contradiction:

Improvesolubility for coatingVSAvoidabrasion resistance

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The patent achieves the optimal balance between solubility and abrasion resistance by controlling the compositional parameters of the polyarylate resin. The third percentage (>0% and <50%) and fourth percentage (≥35% and <70%) are optimized to ensure sufficient solubility for coating processes while maintaining high abrasion resistance and member contact resistance in the final photosensitive layer.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12339618B2Polyarylate resin and electrophotographic photosensitive member

Publication Date: 2025.06.24 KYOCERA DOCUMENT SOLUTIONS INC

AI summary

A polyarylate resin includes repeating units represented by formulas (1), (2), (3), and (4).A third percentage is greater than 0% and less than 50%. The third percentage is a percentage of the number of repeats of the repeating unit represented by formula (3) relative to the total of the number of repeats of the repeating unit represented by formula (1) and the number of repeats of the repeating unit represented by formula (3). A fourth percentage is at least 35% and less than 70%. The fourth percentage is a percentage of the number of repeats of the repeating unit represented by formula (4) relative to the total of the number of repeats of the repeating unit represented by formula (2) and the number of repeats of the repeating unit represented by formula (4).