Toner Eutectic Structure Balancing Fixability and Endurance
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Solution Overview
Problem
Existing toners face challenges in achieving both low-temperature fixability and high-temperature storage stability while maintaining endurance, as the addition of wax to improve releasability can lead to cracking or chipping due to independent crystallization of the resin and wax components.
Innovation Solution
A toner formulation is developed with a eutectic mixture of a vinyl polymer containing a monomer unit with a long-chain alkyl group and a wax, characterized by a specific luminance histogram in scanning transmission electron microscopy, ensuring the resin and wax form a stable structure without clear boundaries, enhancing endurance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a crystalline resin is used to improve low-temperature fixability and high-temperature storage stability, then the toner achieves good fixability and storage stability, but the addition of wax causes independent crystallization of resin and wax leading to cracking or chipping
Solution Approach 1:
The patent changes the molecular structure parameters of the resin by introducing specific side chain structures ( Formula 1 with R1-R6 representing different groups) and controlling the ratio of specific monomer units (Formula 2 and Formula 3) to adjust the crystallization behavior and melting characteristics of the resin, enabling it to form a eutectic mixture with wax rather than crystallizing independently
Solution Approach 2:
The patent creates a composite material system where the crystalline vinyl resin and wax form a eutectic mixture with intimate molecular-level mixing. This composite structure prevents separate crystallization of resin and wax, eliminating the interface problems that cause cracking and chipping, while maintaining the beneficial properties of both components
2Temperature
If the glass transition point of the resin component is lowered to improve low-temperature fixability, then the toner can be fixed at lower temperatures, but the high-temperature storage stability of the toner is reduced
Solution Approach 1:
The patent utilizes the phase transition characteristics of crystalline resins, which have a sharp melt at their melting point that rapidly decreases viscosity. This allows the resin to remain stable at high temperatures during storage (crystalline state) but flow easily at the melting point during fixing, enabling both high-temperature storage stability and low-temperature fixability
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 achieves good low-temperature fixability, high-temperature storage stability, and releasability with improved endurance by forming a eutectic structure between the resin and wax components, preventing cracking and chipping.
Implementation Method 1
Due to a regular arrangement of intermolecular or intramolecular alkyl groups, crystalline resins rarely soften below their melting points. In crystalline resins with such properties, crystals melt rapidly (sharp melt) at the melting point
Implementation Method 2
A toner formulation is developed with a eutectic mixture of a vinyl polymer containing a monomer unit with a long-chain alkyl group and a wax, characterized by a specific luminance histogram in scanning transmission electron microscopy, ensuring the resin and wax form a stable structure without clear boundaries
Data Source
AI summary
A toner contains a toner particle containing a resin component and a wax. The resin component contains a vinyl polymer A having a monomer unit A represented by the formula (A):In a luminance histogram created from STEM observation, the total pixel value C in luminance 0 to 9 and the total pixel value A in luminance 0 to 245 satisfy 0.000≤C/A≤0.250. When the pixel value in luminance 10 to 245 has a maximum value P at luminance X, luminance M-luminance N ranges from 120 to 235, wherein the luminance M denotes a luminance at which the pixel value falls below 20% of P for the first time from the luminance X to 245, and the luminance N denotes a luminance at which the pixel value falls below 20% of the P for the first time from the luminance X to 10.