Core-Shell Toner Durability Against Mechanical Deformation
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Solution Overview
Problem
Conventional toners in image forming apparatuses are prone to deformation and fusion under mechanical load, leading to white spots in images, particularly at high processing speeds, due to insufficient durability.
Innovation Solution
An electrostatic charge image developing toner with a sea-island structure, comprising a continuous phase of binder resin and a discontinuous phase with a core and coating layer, where the core and coating layer also contain binder resin, enhancing the toner's durability by acting as a filler and improving mechanical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional toner is used in image forming apparatus, then the toner can be processed at high speed, but the toner deforms and fuses under mechanical load causing white spots in images
Solution Approach 1:
The toner is constructed as a composite material system with binder resin as the continuous phase and core-shell particles as the discontinuous phase. The core contains binder resin (ii) and the shell contains binder resin (iii), creating a multi-component composite structure that provides both processing speed and durability. This composite approach allows the toner to maintain integrity under mechanical load while enabling high-speed processing.
Solution Approach 2:
The toner particle is segmented into distinct phases: a continuous binder resin phase (i) and discontinuous core-shell particles. Each segment has specific functions - the continuous phase provides binding and flow properties for high-speed processing, while the discrete core-shell particles provide structural integrity and durability. This segmentation allows independent optimization of each component for its specific function.
2Ease of operation
If toner is subjected to mechanical load during stirring for charging, then the toner can be charged effectively, but the toner deforms and fuses leading to white spots
Solution Approach 1:
The composite structure with binder resin (i) as continuous phase and core-shell particles as discontinuous phase creates a material that is both chargeable and durable. The core-shell structure specifically prevents deformation during stirring while maintaining charging efficiency, as the rigid core provides structural support against mechanical stress.
Solution Approach 2:
Different regions of the toner particle have different properties optimized for specific functions. The continuous binder resin (i) regions provide flexibility and charging capability, while the core-shell particle regions provide structural rigidity and resistance to deformation. This local differentiation of properties allows the toner to simultaneously achieve good charging efficiency and maintain image quality.
Data Source
AI summary
An electrostatic charge image developing toner includes a continuous phase containing a binder resin (i); and a discontinuous phase that has a core containing a binder resin (ii) and a coating layer covering the core and containing a binder resin (iii), and is dispersed in the continuous phase.