Developing Roller Surface Layer Copolymer Adhesion
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Solution Overview
Problem
Developing rollers used in electrophotographic devices face challenges in maintaining triboelectric charge-providing performance under high-temperature, high-humidity environments, and suffer from surface layer peeling issues due to reduced adhesiveness between the surface layer and the silicone rubber elastic layer.
Innovation Solution
A developing roller with a surface layer comprising a binder resin and a copolymer containing structural units represented by specific formulas, which enhances triboelectric charge-providing performance while minimizing peeling by improving adhesiveness through dipole-dipole interactions between the surface layer and the silicone rubber elastic layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a copolymer containing a quaternary ammonium base is added to the surface layer of the developing roller, then the charge-providing performance for the developer is improved, but the adhesiveness between the surface layer and the silicone rubber elastic layer reduces, causing the surface layer to peel off
Solution Approach 1:
The invention changes the chemical composition parameters of the surface layer by incorporating specific copolymers with controlled structures (containing both quaternary ammonium groups for charging and carboxyl groups for adhesion) to simultaneously achieve good charge-providing performance and adhesiveness. The copolymer composition is optimized to balance these two opposing requirements.
Solution Approach 2:
The surface layer is constructed as a composite material combining binder resin with specific copolymers that have dual functionality: quaternary ammonium groups for triboelectric charging and carboxyl groups for adhesion to the silicone rubber elastic layer. This composite structure allows the surface layer to fulfill both charging and bonding functions simultaneously.
2Adaptability or versatility
If the developing roller is used in high-temperature, high-humidity environments, then the triboelectric charge quantity of the developer reduces, but the variety of environments where the apparatus is used has increased
Solution Approach 1:
The invention modifies the surface layer composition with copolymers that have specific functional groups (quaternary ammonium and carboxyl) designed to maintain stable triboelectric charging performance across a wide range of environmental conditions, particularly high-temperature and high-humidity environments, thereby improving adaptability without sacrificing charge-providing reliability.
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 provides stable charge-providing performance under high-temperature, high-humidity conditions and prevents surface layer peeling, ensuring high-quality electrophotographic images and extended device reliability.
Implementation Method 1
Such developer carrying member serves to provide charge for the developer through triboelectric charging as well as to convey the developer.
Implementation Method 2
improving adhesiveness through dipole-dipole interactions between the surface layer and the silicone rubber elastic layer
Data Source
AI summary
Provided is the following developer carrying member. The member has high charge-providing performance even under a high-temperature, high-humidity environment, and its surface layer hardly peels off its elastic layer even after long-term standing under the high-temperature, high-humidity environment. The developer carrying member comprises a mandrel, an elastic layer including a silicone rubber, and a surface layer covering a surface of the elastic layer, and the surface layer comprises a binder resin, and a copolymer having structural units of formula (1) and formula (2). R1 represents an alkyl group having 10-18 carbon atoms, R2 represents a methyl group or a hydrogen atom, R3 represents an alkylene group having 1-4 carbon atoms, X− represents a chloride ion, a bromide ion, or a p-toluenesulfonic acid ion, R4 represents a methyl group or a hydrogen atom, and R5 represents an alkylene group having 1-4 carbon atoms.