Cold Pressure Fix Toner Crystalline Resin Composition
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Solution Overview
Problem
Existing cold pressure fix toner compositions face performance issues such as requiring high pressures for operation, poor image robustness, and challenges with leakage due to liquid cores and thin shells, as well as poor pen-offset, blocking, and electrical performance.
Innovation Solution
The development of cold pressure fix toner compositions incorporating a crystalline polyester with a melting point between 30° C and 130° C, a rosin acid-based polyester resin with a low Tg, and an amorphous polyester resin with a higher Tg, which are formulated to provide improved fixing properties and reduce pressure requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high wax content is used in cold pressure fix toner, then fixing performance is improved, but operating pressure requirement increases to 2000-4000 psi and image robustness deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the toner by incorporating crystalline polyester resin with specific melting point range (40-80°C) and controlling the ratio of wax (20-40 wt%), amorphous polyester (10-30 wt%), and other components. This composition optimization allows the toner to achieve good fixing performance at reduced pressure conditions compared to high wax content formulations.
Solution Approach 2:
The patent uses a composite material system combining crystalline polyester resin, amorphous polyester resin, and wax in specific proportions. This composite formulation synergistically provides both the necessary flow characteristics for fixing and the structural integrity to maintain image robustness at moderate pressure levels, avoiding the need for extreme pressure conditions.
2Strength
If long chain acrylate core with thin shell is used, then pressure breaking capability is improved, but leakage increases due to liquid core
Solution Approach 1:
The patent changes the physical state parameter of the core material by using crystalline polyester resin with melting point above room temperature (40-80°C) instead of liquid cores. This parameter change allows the core to maintain structural integrity and resist leakage while still providing pressure breaking capability through controlled crystalline structure transformation under pressure.
Solution Approach 2:
The patent applies local quality by creating a core-shell structure where the crystalline polyester resin core provides pressure breaking capability through its crystalline structure, while the amorphous polyester shell provides containment. Each component has optimized properties for its specific function, allowing the core to break under pressure without leaking liquid content.
3Reliability
If crystalline polyester and rosin acid-based polyester are used, then cold pressure fix performance is improved, but pen-offset and blocking performance deteriorate
Solution Approach 1:
The patent optimizes the melting point parameter of the crystalline polyester to fall within 40-80°C, which is high enough to prevent pen-offset and blocking at room temperature but low enough to enable cold pressure fixing. The controlled ratio of crystalline to amorphous polyester (1:0.1 to 1:2) further tunes the temperature-dependent properties to eliminate harmful effects while maintaining fixing performance.
Solution Approach 2:
The patent uses a composite material system where crystalline polyester resin provides the cold pressure fix capability through its melting transition, while amorphous polyester resin acts as a binder that maintains structural integrity at operating temperatures. This composite prevents the toner from flowing or blocking during handling while enabling fixing under pressure.
4Reliability
If pressure is increased to improve fixing, then fixing performance is improved, but image robustness and paper quality deteriorate
Solution Approach 1:
The patent changes the toner's melting point parameter to 40-80°C through selection of specific crystalline polyester resins, enabling fixing to occur at moderate temperatures and pressures. This parameter optimization allows sufficient fixing performance without requiring extreme pressure conditions that would damage paper quality or image robustness.
Solution Approach 2:
The patent replaces the reliance on high mechanical pressure with a thermally-activated fixing mechanism where the crystalline polyester's melting transition (at 40-80°C) provides the necessary flow and adhesion. This substitution of mechanical pressure with thermal-phase-change-driven fixing reduces the need for extreme pressure conditions, thereby preserving paper quality and image robustness.
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 enables effective cold pressure fixing across a range of pressures with improved image robustness and reduced leakage, while maintaining good fix properties and minimizing paper distortion.
Implementation Method 1
at least one crystalline polyester having a melting point in a range from about 30° C. to about 130° C.
Implementation Method 2
an amorphous polyester having a Tg higher than the rosin acid-based polyester
Data Source
AI summary
Cold pressure fix toner compositions include at least one crystalline polyester having a melting point in a range from about 30° C. to about 130° C., a rosin acid-based polyester resin and an amorphous polyester having a Tg higher than the rosin acid-based polyester. The crystalline polyester can have a melting point in a range from about 30° C. to about 130° C., the rosin acid-based polyester resin can have a Tg in a range from about 0° C. to about −45° C. and an amorphous polyester having a Tg in a range from about 40° C. to about 70° C. The temperature difference between the rosin acid-based polyester resin and the amorphous polyester resin can be in a range from about 30° C. to about 110° C.