Toner Composition Resolving Fixing Temperature and Hot-Offset Trade-offs
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Solution Overview
Problem
Toner formulations using crystalline resins face challenges in achieving low-temperature fixability while maintaining sufficient hot-offset resistance and bending resistance, as existing solutions either result in hot-offset or cracking due to the release agent's behavior and viscosity changes during high-temperature fixing.
Innovation Solution
A toner composition comprising a crystalline resin A, an amorphous resin B, and a release agent, where the crystalline resin contains a specific unit with a long-chain alkyl group, and the amorphous resin improves phase separation properties, ensuring the release agent bleeds to the image surface and maintains viscosity, thereby enhancing low-temperature fixability and resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a crystalline resin is used as the binder resin to achieve low-temperature fixability, then the fixing temperature can be reduced, but the hot-offset resistance becomes insufficient
Solution Approach 1:
The patent uses a composite binder resin system comprising both crystalline resin (providing low-temperature fixability through sharp melt property) and amorphous resin (providing high-temperature stability). This composite structure allows the toner to achieve both low fixing temperature and sufficient hot-offset resistance by combining the complementary properties of the two resin types.
Solution Approach 2:
The patent carefully controls the melting point of the crystalline resin within a specific range (50-85°C) and adjusts the composition ratios of crystalline and amorphous resins to optimize both low-temperature fixability and hot-offset resistance. By parameterizing the resin properties and their ratios, the patent resolves the contradiction between fixing temperature and hot-offset resistance.
2Ease of operation
If a release agent is added to the crystalline vinyl resin to improve release properties, then the mold releasing effect is enhanced, but the bending resistance decreases due to cracking and peeling
Solution Approach 1:
The patent optimizes the composition of the binder resin, specifically controlling the content of crystalline resin (30-70 mass%) and amorphous resin (5-70 mass%), to balance the mold releasing effect and bending resistance. By adjusting these parameters, the patent achieves sufficient release properties while maintaining image integrity during bending.
Solution Approach 2:
The composite binder resin system provides both the necessary release properties (through the crystalline resin component) and the structural integrity for bending resistance (through the amorphous resin component). This composite approach allows the release agent to function effectively without causing cracking and peeling.
3Temperature
If the amount of crystal component in the binder resin is increased to improve low-temperature fixability, then the viscosity decreases too much during high-temperature fixing, but the hot-offset resistance becomes insufficient
Solution Approach 1:
The patent employs a composite binder resin system where crystalline resin (30-70 mass%) provides low-temperature fixability through sharp melt property, while amorphous resin (5-70 mass%) maintains appropriate viscosity at high temperatures. This composite structure prevents the viscosity from decreasing too much during high-temperature fixing while still achieving low-temperature fixability.
Solution Approach 2:
The patent carefully controls the melting point of the crystalline resin (50-85°C) and the composition ratios to optimize the balance between low-temperature fixability and hot-offset resistance. By parameterizing the resin properties, the patent prevents excessive viscosity decrease during high-temperature fixing.
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 low-temperature fixability, hot-offset resistance, and bending resistance by controlling the crystalline and amorphous resin ratios and phase separation, preventing cracking and peeling during image bending.
Implementation Method 1
the crystal melts rapidly after reaching the endothermic peak temperature, and a sudden drop in the viscosity occurs associated with the melting
Implementation Method 2
the amorphous resin improves phase separation properties, ensuring the release agent bleeds to the image surface
Data Source
AI summary
The toner of the present disclosure comprises a toner particle containing a crystalline resin A, an amorphous resin B, and a release agent, wherein the resin A contains a specific amount of a unit (a) and is contained in a specific amount in the toner, the resin B is contained in a specific amount in the toner, the total content of the resin A and the resin B is 50.0 mass % or more based on the mass of the toner, when a component W having a molecular weight of 5000 or less is isolated from the toner by a certain procedure, the content of the component W is from 0.5 mass % to 20.0 mass % based on the mass of the toner, and the maximum endothermic peak temperature of the component W and the endothermic peak temperature derived from the component W of the toner satisfy a certain requirement.