Polyarylate Resin Ether Structure for Toner Transfer
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Solution Overview
Problem
Electrophotographic photosensitive members with polyarylate resin binder experience deterioration in transferability under low-temperature/low-humidity conditions due to strong adhesion forces generated between the toner with strontium titanate and the photosensitive member, leading to reduced durability and increased residual toner density.
Innovation Solution
Incorporating a resin X with an ether structure between aromatic rings in the polyarylate resin structure, which reduces the generation of COOH groups and adhesion forces, maintaining durability and enhancing transferability by using strontium titanate as an external additive for the toner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyarylate resin is used as binder resin to enhance durability, then mechanical strength and durability are improved, but transferability deteriorates under low-temperature/low-humidity conditions
Solution Approach 1:
The invention changes the chemical structure parameters of the polyarylate resin by incorporating aromatic ether groups into the main chain structure. This structural modification alters the resin's chemical properties, specifically reducing COOH group generation and adhesion forces, thereby improving transferability while maintaining the mechanical strength provided by the polyarylate backbone
Solution Approach 2:
The invention creates a composite resin structure by combining polyarylate resin with aromatic ether groups. This composite approach integrates the high mechanical strength of polyarylate with the reduced adhesion characteristics of aromatic ether structures, achieving both durability and improved transferability under low-temperature/low-humidity conditions
2Reliability
If strontium titanate is used as external additive for toner to control chargeability, then chargeability is improved, but adhesion force increases causing poor transferability
Solution Approach 1:
The invention changes the chemical parameter of the binder resin by incorporating aromatic ether groups, which reduces COOH group generation. This parameter change decreases the adhesion force between the toner (containing strontium titanate) and the photosensitive member, thereby improving transferability while maintaining the chargeability control provided by strontium titanate
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 effectively maintains the durability of the electrophotographic photosensitive member and improves transferability even under low-temperature/low-humidity conditions, reducing residual toner density and ensuring consistent image quality.
Implementation Method 1
a charging unit that charges a surface of the electrophotographic photosensitive member with electricity
Implementation Method 2
an exposing unit that irradiates the charged surface of the electrophotographic photosensitive member with light to form an electrostatic latent image
Data Source
AI summary
An image-forming apparatus with strontium titanate used as an external additive for a toner is provided, wherein the image-forming apparatus is an electrophotographic apparatus that has the durability of an electrophotographic photosensitive member maintained and is superior in transferability even under low-temperature/low-humidity conditions. An electrophotographic apparatus is provided, the electrophotographic apparatus including: an electrophotographic photosensitive member having a surface layer containing a resin X as a binder resin; a charging unit; an exposing unit; a developing unit; and a transferring unit, wherein the toner contains strontium titanate as an external additive, and the resin X contains a structural unit represented by Formula (1).