Core-Shell Toner Particles Thermal Resistance
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Solution Overview
Problem
Existing toner matrix particles with core-shell structures face issues of insufficient thermal resistance and charging properties due to incompatible core and shell resins, leading to poor image quality and transfer efficiency, especially at high temperatures and humidity.
Innovation Solution
A method for producing toner matrix particles with a core-shell structure, where the core particle includes an amorphous resin A and a crystalline material, and the shell is composed of an amorphous resin B, with specific temperature adjustments and pH conditions to ensure the shell is not fused with the core, allowing for improved coating and enhanced thermal resistance and charging properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a core-shell structure with different resins is used to achieve low-temperature fixing properties, then fixing temperature is reduced, but thermal resistance during storage deteriorates
Solution Approach 1:
The patent applies local quality by creating a core-shell structure where the core particle contains amorphous resin A with low Tg for low-temperature fixing, while the shell contains amorphous resin B with high Tg for thermal resistance during storage. Each region has different material properties optimized for its specific function, resolving the contradiction between low-temperature fixing and storage stability.
2Adaptability or versatility
If different resins are used for core and shell to achieve functional differentiation, then fixing properties improve, but compatibility between core and shell deteriorates
Solution Approach 1:
The patent uses parameter changes by carefully selecting and controlling the glass transition temperatures of the resins. Amorphous resin A has Tg of 0°C to 50°C for fixing functionality, while amorphous resin B has Tg of 50°C to 100°C for storage stability. This parameter differentiation enables functional separation while maintaining overall system compatibility through controlled thermal properties.
3Manufacturing precision
If core and shell are made from the same resin to improve compatibility, then coating uniformity improves, but functional differentiation deteriorates
Solution Approach 1:
The patent applies local quality by creating a core-shell structure where the core particle contains amorphous resin A with low Tg for low-temperature fixing, while the shell contains amorphous resin B with high Tg for thermal resistance during storage. Each region has different material properties optimized for its specific function, resolving the contradiction between low-temperature fixing and storage stability.
4Reliability
If shell resin is added to form a coat domain, then thermal resistance improves, but charging properties deteriorate
Solution Approach 1:
The patent uses parameter changes by carefully selecting and controlling the glass transition temperatures of the resins. Amorphous resin A has Tg of 0°C to 50°C for fixing functionality, while amorphous resin B has Tg of 50°C to 100°C for storage stability. This parameter differentiation enables functional separation while maintaining overall system compatibility through controlled thermal properties.
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 method results in toner particles with high compatibility between thermal resistance and low-temperature fixing properties, improved charging properties, and high-quality images, by reducing surface irregularities and ensuring even deposition of the shell on the core particles.
Implementation Method 1
adjusting a temperature of the dispersion to be equal to or higher than (a glass transition temperature (Tg-a) of the amorphous resin A+10)° C. and equal to or lower than (a melting point (Tm-c) of the crystalline material+10)° C., to prepare a core particle dispersion through coagulation and coalescence
Implementation Method 2
cooling the core particle dispersion prepared in Step I to a temperature equal to or lower than the glass transition temperature (Tg-a) of the amorphous resin A
Implementation Method 3
adding a dispersion of the amorphous resin B to the core particle dispersion... the shell including a phase of the amorphous resin B that is not fused with the core particle at the interface
Data Source
AI summary
A method of producing a toner for developing electrostatic images includes Steps I to III is provided. The toner includes a toner matrix particle having a core-shell structure. The toner matrix particle includes a core particle including an amorphous resin A and a crystalline material, and a shell including an amorphous resin B. The shell includes a phase of the amorphous resin B that is not fused with the core particle at the interface. The amorphous resin A differs from the amorphous resin B.