Polyester Resin Toner With Dual Wax for Stable Charging
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Solution Overview
Problem
Existing toner technologies face challenges in achieving both high productivity and stable image quality due to changes in charging performance during long-term storage and increased speed, particularly with core-shell structures and wax compatibility issues.
Innovation Solution
A toner composition comprising a polyester resin with specific monomer units of isophthalic acid and dodecenylsuccinic acid, combined with hydrocarbon and ester waxes, controlled at specific ratios to enhance compatibility and crystallization, ensuring stable charging performance during continuous printing and long-term storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a core-shell structure with high compatibility parameter shell layer is used to increase shielding effect, then heat-resistant storage stability is improved, but compatibility with crystalline material is reduced and low-temperature fixability deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters of the binder resin by incorporating specific monomer units (isophthalic acid unit 10-30 mass%, dodecenylsuccinic acid unit 5-20 mass%) to achieve optimal balance between heat-resistant storage stability and low-temperature fixability, resolving the contradiction through precise parameter control
2Reliability
If polyester resin with high compatibility parameter is disposed at toner particle surface to improve compatibility, then charging performance initially improves, but during continuous printing charge continues to rise causing image defects
Solution Approach 1:
The invention controls the content of dodecenylsuccinic acid unit within 5-20 mass% to regulate the compatibility between binder resin and wax, preventing excessive charge accumulation during continuous printing while maintaining stable charging performance
3Stability of the object's composition
If compatible wax component is present in large amounts after toner production, then compatibility with binder resin is improved, but during long-term storage wax transfers to toner surface causing charging performance decline
Solution Approach 1:
The invention optimizes the ratio of hydrocarbon wax to ester wax (W1/W2 = 0.1 to 0.8) and controls dodecenylsuccinic acid unit content (5-20 mass%) to achieve sufficient compatibility while preventing excessive wax migration during long-term storage, thereby maintaining stable charging performance
4Productivity
If low glass transition temperature and reduced melt viscosity are used to improve low-temperature fixability, then fixing speed is improved, but relaxation phenomena occur during long-term storage causing charging performance changes
Solution Approach 1:
The invention creates a composite binder resin system combining polyester resin with specific monomer units (isophthalic acid and dodecenylsuccinic acid) that provides both low-temperature fixability and long-term storage stability, resolving the contradiction through material composition design
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 excellent charge rising performance and low-temperature fixability, maintaining stable charging performance even during continuous printing and long-term storage, addressing the limitations of previous technologies.
Implementation Method 1
the wax comprises a hydrocarbon wax and an ester wax... improving the compatibility and separability between polyester resin and wax during fixing
Data Source
AI summary
The toner comprising a toner particle comprising a binder resin and a wax, the binder resin comprises a polyester resin; the wax comprises a hydrocarbon wax and an ester wax; the ester wax comprises at least one compound selected from the group consisting of monoester compounds and diester compounds; the polyester resin comprises a polyester resin A comprising a specific amounts of a monomer unit corresponding to isophthalic acid and a monomer unit corresponding to dodecenylsuccinic acid; and the value of W1/W2, which is the ratio of the content WI of the hydrocarbon wax to the content W2 of the ester wax, is 0.15 to 0.80.