Toner Set with Pressure Phase Transition for Offset and Bondability
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Solution Overview
Problem
Existing toner sets face challenges in suppressing offset during thermal fixing and achieving press bondability, as they often experience excessive viscosity leading to degraded bondability and offset issues due to inadequate tan δ values.
Innovation Solution
A toner set comprising a color toner and a transparent toner with specific pressure phase transition properties, where tan δ1 is between 1.0 and 4.0, and tan δ1/tan δ2 is between 1.2 and 3.0, ensuring improved fixability and bondability by controlling the molecular weights and composition of toner particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional toner sets are used with standard tan δ values, then the toner maintains basic flowability, but offset occurs during thermal fixing and press bondability is degraded due to excessive viscosity
Solution Approach 1:
The invention changes the rheological parameters of the toner by controlling tan δ1 (loss tangent at 100°C) to be 0.5 or less and tan δ1/tan δ2 ratio to be 0.2 or less. This parameter optimization allows the toner to achieve both low viscosity at thermal fixing temperature (suppressing offset) and appropriate bondability at press bonding conditions
Solution Approach 2:
The invention uses a composite binder resin system comprising a crystalline polyester resin and an amorphous polyester resin in specific proportions (crystalline: 30-70 mass%, amorphous: 70-30 mass%). This composite structure enables the toner to exhibit different rheological properties at different temperatures, achieving both offset suppression and press bondability
2Ease of operation
If tan δ1 is less than 1.0 or more than 4.0, then the toner shows improved flowability, but press bondability is significantly degraded
Solution Approach 1:
The invention optimizes the tan δ1 parameter to be 0.5 or less (within the range of 0.01-0.5), which is more restrictive than the general 1.0-4.0 range. This precise parameter control ensures the toner has sufficient flowability for uniform application while maintaining adequate viscosity for press bondability
3Reliability
If the toner viscosity is reduced to improve press bondability, then offset during thermal fixing increases
Solution Approach 1:
The invention exploits the phase transition behavior of the crystalline polyester resin component. The crystalline resin remains solid at thermal fixing temperature (maintaining low viscosity and preventing offset) but transitions to a more compliant state under press bonding conditions (improving bondability). The glass transition temperature of the amorphous resin is controlled to be 60-90°C to facilitate this phase behavior
Solution Approach 2:
The composite binder resin system (crystalline polyester + amorphous polyester) creates a synergistic effect where the crystalline component provides thermal stability and offset prevention, while the amorphous component provides bondability under pressure. The specific ratio range (30-70 mass% crystalline, 70-30 mass% amorphous) optimizes this dual functionality
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 set effectively suppresses offset during thermal fixing and enhances press bondability by maintaining optimal viscosity and image stability, ensuring better fixability and bondability.
Implementation Method 1
a transparent toner with specific pressure phase transition properties
Implementation Method 2
suppresses offset during thermal fixing
Data Source
AI summary
A toner set includes a color toner and a transparent toner that has a pressure phase transition property. The color toner and the transparent toner satisfy 1.0≤tan δ1≤4.0 and 1.2≤tan δ1/tan δ2≤3.0 where tan δ1 represents tan δ of the color toner at 100° C., and tan δ2 represents tan δ of the transparent toner at 100° C.