Toner Particles with Core-Shell Segmentation for Fixability
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Solution Overview
Problem
Toner formulations face challenges in achieving improved low-temperature fixability without compromising durable stability, offset resistance, gloss performance, and penetration resistance, as existing solutions often result in trade-offs between these properties.
Innovation Solution
A toner composition incorporating a binder resin, colorant, wax, and inorganic fine particles, with specific dynamic viscoelastic properties characterized by local maxima in storage elastic modulus curves at defined temperature ranges, ensuring compatibility between low-temperature fixability and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the low-temperature fixability of toner is improved, then the toner can be fixed on a transfer material at a reduced temperature, but the durable stability in continuous printing after storage under high-temperature, high-humidity environment reduces
Solution Approach 1:
The toner particle is divided into a core region containing a binder resin with low glass transition point (for low-temperature fixability) and a shell layer containing a binder resin with high glass transition point (for durable stability). This segmentation allows each region to independently provide its specific function without compromising the other.
Solution Approach 2:
Different regions of the toner particle are assigned different material properties: the core has low Tg binder resin for flexibility and low-temperature fixation, while the shell has high Tg binder resin for stability and resistance to exudation during storage. This local differentiation resolves the contradiction between low-temperature fixability and durable stability.
2Temperature
If the low-temperature fixability of toner is improved, then the toner can be fixed at reduced temperature, but the offset resistance reduces
Solution Approach 1:
The shell layer containing high Tg binder resin acts as a barrier that prevents toner migration to the transfer material after fixation, thereby maintaining offset resistance even when the core enables low-temperature fixing.
Solution Approach 2:
The shell region with high Tg binder resin provides the necessary rigidity and stability to prevent offset, while the core region with low Tg binder resin enables low-temperature fixation. This local quality differentiation resolves the contradiction between low-temperature fixability and offset resistance.
3Temperature
If the low-temperature fixability of toner is improved, then the toner can be fixed at reduced temperature, but the gloss performance reduces
Solution Approach 1:
The shell layer with high Tg binder resin provides a smooth, stable surface that develops high gloss, while the core with low Tg binder resin enables low-temperature fixation. The segmentation allows both functions to coexist.
Solution Approach 2:
The shell region is designed with high Tg binder resin to provide the surface quality necessary for high gloss, while the core region provides low-temperature fixability. This local quality differentiation resolves the contradiction between low-temperature fixability and gloss performance.
4Temperature
If the low-temperature fixability of toner is improved, then the toner can be fixed at reduced temperature, but the penetration resistance reduces
Solution Approach 1:
The shell layer acts as a protective barrier that prevents excessive penetration and maintains uniform gloss, while the core enables low-temperature fixation. This segmentation resolves the contradiction between low-temperature fixability and penetration resistance.
Solution Approach 2:
The shell region with high Tg binder resin provides the necessary penetration resistance and uniformity, while the core region with low Tg binder resin provides low-temperature fixability. This local quality differentiation resolves the contradiction.
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 toner exhibits enhanced durable stability, excellent offset resistance, and high-quality image formation while maintaining improved low-temperature fixability, addressing the trade-offs encountered in previous formulations.
Implementation Method 1
a binder resin having a glass transition point (Tg) of 60.0 to 100.0° C.
Data Source
AI summary
Provided is a toner including toner particles each containing a binder resin, a colorant, and a wax, and inorganic fine particles, the toner having such a characteristic that a temperature-storage elastic modulus curve at a high frequency shows a characteristic change in its behavior in a specific temperature region with respect to a temperature-storage elastic modulus curve at a low frequency.