Crystalline Polyester Toner for High-Speed Imaging
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Solution Overview
Problem
In high-speed electrostatic image forming processes, existing toners face issues with solvent oozing and toner filming due to temperature increases, leading to aggregation and photoreceptor cracks, while maintaining low-temperature fixing properties and charging control is challenging.
Innovation Solution
The development of an electrostatic-image-developing toner containing a crystalline polyester resin with a melting temperature between 25°C and 50°C and an amorphous polyester resin, optimized in content and acid value, to enhance drying efficiency and prevent solvent retention, thereby reducing toner filming and improving charging properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional toner is used in high-speed electrostatic image forming processes, then image formation speed is improved, but solvent oozing and toner filming occur due to temperature increases
Solution Approach 1:
The patent changes the melting temperature parameter of the polyester resin from conventional ranges to a specific range of 25°C to 50°C. This parameter change allows the resin to remain stable at elevated temperatures during high-speed image formation while preventing solvent oozing and toner filming, thus resolving the contradiction between productivity and harmful factors.
Solution Approach 2:
The patent uses a composite binder resin system comprising both crystalline polyester resin (with melting temperature of 25°C to 50°C) and amorphous polyester resin. This composite material approach combines the temperature stability of crystalline polyester with the flexibility and adhesion properties of amorphous polyester, preventing solvent oozing while maintaining low-temperature fixing properties during high-speed operation.
2Manufacturing precision
If the melting temperature of crystalline polyester resin is reduced to improve drying efficiency, then solvent retention is reduced, but low-temperature fixing properties may be compromised
Solution Approach 1:
The patent optimizes the melting temperature parameter of crystalline polyester resin to a specific range of 25°C to 50°C. This controlled parameter change ensures sufficient drying efficiency to prevent solvent retention while maintaining the low-temperature fixing properties necessary for reliable image formation, resolving the contradiction between manufacturing precision and reliability.
Solution Approach 2:
The patent employs a composite resin system where crystalline polyester resin (providing drying efficiency through controlled melting) is combined with amorphous polyester resin (providing low-temperature fixing properties). This composite approach allows both functions to coexist, preventing solvent retention while maintaining reliable low-temperature fixing performance.
3Ease of manufacture
If conventional toner composition is used, then production simplicity is maintained, but charging control and background fogging are problematic
Solution Approach 1:
The patent modifies the chemical composition parameters of the binder resin by introducing crystalline polyester resin with specific melting temperature characteristics. This parameter change improves charging control and reduces background fogging while maintaining production simplicity through a relatively straightforward synthesis process, resolving the contradiction between ease of manufacture and ease of operation.
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 improved drying efficiency, reduces solvent retention, and maintains low-temperature fixing properties, preventing toner aggregation and photoreceptor cracks, while effectively controlling charging and minimizing background fogging.
Implementation Method 1
the crystalline polyester resin has a melting temperature Tmc of about 25° C. or greater but not greater than about 50° C.
Data Source
AI summary
An electrostatic-image-developing toner includes a binder resin that contains a crystalline polyester resin and an amorphous polyester resin; and a coloring agent, wherein the crystalline polyester resin has a melting temperature Tmc of about 25° C. or greater but not greater than about 50° C., and a content of the crystalline polyester resin in the electrostatic-image-developing toner is about 3 wt % or greater but not greater than about 15 wt. %.