Polyamide Intermediate Layer for Photosensitive Member Moisture Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electrophotographic photosensitive members face challenges in maintaining sensitivity and preventing fogging in high-temperature and high-humidity environments due to moisture absorption and increased resistance in intermediate layers, leading to suboptimal performance.
Innovation Solution
Incorporating a specific polyamide resin with a high percentage content of aliphatic dicarboxylic acid and diamine-derived units, combined with metal oxide particles and surface treatment layers, in the intermediate layer to enhance adhesion and inhibit moisture absorption, along with an n-type pigment in the photosensitive layer to improve dispersibility and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional intermediate layer is used, then the structure is simple, but moisture absorption increases and resistance increases in high-temperature and high-humidity environments
Solution Approach 1:
The intermediate layer uses a composite material system consisting of a polyamide resin (providing structural framework and adhesion) combined with metal oxide particles (providing moisture resistance and electrical stability). This composite structure resolves the contradiction by integrating materials with complementary properties that collectively resist moisture absorption and maintain electrical performance in harsh environments.
Solution Approach 2:
The patent specifies precise compositional parameters for the polyamide resin (repeating unit structure with at least 80% aliphatic dicarboxylic acid and diamine compound) and metal oxide particle content (50-1000 parts by mass per 100 parts resin). By optimizing these parameters, the intermediate layer achieves reduced moisture absorption and maintained electrical resistance in high-temperature and high-humidity conditions.
2Strength
If the intermediate layer contains metal oxide particles, then adhesion increases, but manufacturing precision requirements increase
Solution Approach 1:
The patent establishes specific parameter ranges for metal oxide particle content (50-1000 parts by mass per 100 parts polyamide resin) and specifies the repeating unit composition of the polyamide resin (at least 80% aliphatic dicarboxylic acid and diamine compound). These parameter specifications provide manufacturing guidelines that balance adhesion enhancement with achievable production precision.
Solution Approach 2:
The metal oxide particles are distributed within the polyamide resin matrix to create localized regions of enhanced adhesion and moisture resistance. This local quality approach allows the intermediate layer to achieve strong bonding at particle interfaces while maintaining overall manufacturing feasibility through controlled dispersion rather than uniform distribution.
3Reliability
If the polyamide resin has high content of aliphatic dicarboxylic acid and diamine units, then environmental dependence of sensitivity decreases, but device complexity increases
Solution Approach 1:
The patent defines the polyamide resin composition by specifying that repeating units from aliphatic dicarboxylic acid and diamine compounds constitute at least 80% of total repeating units. This parameter specification simplifies the resin selection process and ensures consistent performance across environments by focusing on the key structural feature that provides environmental stability.
Solution Approach 2:
The complex requirement for environmental stability is segmented into two independent components: the polyamide resin matrix (providing structural stability and adhesion) and the metal oxide particles (providing moisture resistance). This segmentation allows each component to be optimized independently, reducing the overall complexity of achieving reliable environmental 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 solution reduces environmental dependence of sensitivity and effectively inhibits fogging in high-temperature and high-humidity conditions by maintaining optimal electrical conductivity and adhesion, ensuring consistent performance.
Implementation Method 1
moisture absorption and increased resistance in intermediate layers
Implementation Method 2
a charge generating material, an electron transport material, a binder resin, a hole transport material, and an n-type pigment
Data Source
AI summary
An electrophotographic photosensitive member includes a conductive substrate, an intermediate layer provided on the conductive substrate, and a photosensitive layer provided on the intermediate layer. The intermediate layer contains a specific polyamide resin and specific inorganic particles. The specific inorganic particles include metal oxide particles. The specific polyamide resin includes a first repeating unit derived from an aliphatic dicarboxylic acid and a second repeating unit derived from a diamine compound. The total percentage content of the first repeating unit and the second repeating unit is at least 80% by mol to all repeating units included in the specific polyamide resin. The photosensitive layer contains a charge generating material, an electron transport material, a binder resin, a hole transport material, and an n-type pigment.