Toner Formulation with Ester Wax for Low-Temperature Fixability
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Solution Overview
Problem
Existing toner technologies face challenges in achieving high-speed printing with stable image quality due to issues such as reduced charge rising performance and image quality variations during continuous printing, particularly when exposed to high-temperature and high-humidity environments.
Innovation Solution
A toner formulation incorporating a polyester resin with a monomer unit corresponding to dodecenylsuccinic acid and an ester wax with a specific SP value (8.70 to 9.00) along with a compound A having a polyether structure, which enhances compatibility and charging stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the affinity between ester wax and toner binder resin is increased to improve low-temperature fixability, then low-temperature fixability is improved, but charge rising performance is reduced
Solution Approach 1:
The invention changes the chemical structure parameters of the ester wax by specifying a particular molecular structure with a carboxyl group and controlling the carbon atom numbers in specific chains. This structural parameter change achieves optimal balance between affinity with binder resin (for low-temperature fixability) and charge rising performance, resolving the contradiction between these two properties.
Solution Approach 2:
The invention creates a composite material system by combining specifically structured ester wax with toner binder resin. The composite achieves synergistic effects where the ester wax provides both adequate affinity for low-temperature fixation and maintains charge rising performance through its unique molecular structure, resolving the trade-off between these properties.
2Temperature
If the affinity between ester wax and toner binder resin is increased to improve low-temperature fixability, then low-temperature fixability is improved, but image quality variation occurs during continuous printing
Solution Approach 1:
The invention controls specific structural parameters of the ester wax (carbon atom numbers in chains, presence of carboxyl group) to achieve optimal affinity with the binder resin. This controlled affinity improvement provides low-temperature fixability while preventing excessive interaction that would cause image quality variation during continuous printing.
3Temperature
If the amount of wax added is increased to improve low-temperature fixability, then low-temperature fixability is improved, but compatibility with toner binder resin increases causing charging performance reduction
Solution Approach 1:
Instead of increasing wax amount, the invention changes the chemical structure parameters of the ester wax. The specific molecular structure achieves high low-temperature fixability with lower wax content, thereby maintaining charging performance while improving fixation temperature characteristics.
4Temperature
If the amount of wax added is increased to improve low-temperature fixability, then low-temperature fixability is improved, but image density uniformity is reduced
Solution Approach 1:
The invention changes the chemical structure parameters of the ester wax to achieve optimal compatibility and interaction with the binder resin. This structural optimization provides low-temperature fixability while maintaining uniform image density, avoiding the problems caused by simply increasing wax amount.
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 excellent low-temperature fixability and stable charging characteristics, ensuring image stability and uniformity during continuous printing, even under varying environmental conditions.
Implementation Method 1
the ester wax has an SP value (cal/cm3)0.5 of 8.70 to 9.00... which enhances compatibility and charging stability
Implementation Method 2
a compound A having a polyether structure, which enhances compatibility and charging stability
Data Source
AI summary
A toner having a toner particle including a binder resin, wherein the toner particle includes a compound A having a specific polyether structure and an ester wax, the binder resin includes a polyester resin, the polyester resin has a monomer unit corresponding to dodecenylsuccinic acid, and the ester wax has an SP value (cal/cm3)0.5 of 8.70 to 9.00.