Cold Pressure Fix Toner Using Crystalline Polyester
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Solution Overview
Problem
Existing cold pressure fix toner compositions require high pressures for effective fixing, often leading to image robustness issues and challenges in preventing leakage due to liquid cores at room temperature, and existing solutions do not efficiently manage pressure-dependent viscosity transitions.
Innovation Solution
A cold pressure fix toner composition comprising a crystalline polyester material with a melting point between 30°C to 130°C and an amorphous organic material with a glass transition temperature between -30°C to 70°C, in a weight ratio of 60:40 to 95:5, which undergoes a phase change from solid to liquid at modest temperatures under low pressure, allowing for effective fixing at pressures as low as 25 kgf/cm² to 400 kgf/cm² without significant heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high pressure is used for cold pressure fix toner, then toner fixing effectiveness is improved, but image robustness deteriorates and leakage prevention becomes difficult
Solution Approach 1:
The patent changes the physical state parameters of the toner core material by using a crystalline polyester with a specific melting point range (30°C to 130°C) rather than a liquid core at room temperature. This parameter change allows the toner to achieve effective fixing at lower pressures (25-400 kgf/cm²) while maintaining image robustness and preventing leakage, resolving the contradiction between fixing effectiveness and image quality
Solution Approach 2:
The patent employs a composite material system consisting of crystalline polyester and amorphous organic compound in a weight ratio of 60:40 to 95:5. This composite structure combines the low-temperature melting properties of crystalline polyester with the appropriate viscosity characteristics of amorphous compounds, enabling effective cold pressure fixing at reduced pressures while maintaining image robustness
2Ease of operation
If liquid core at room temperature is used, then cold pressure fix operation is enabled, but leakage prevention becomes difficult
Solution Approach 1:
The patent changes the temperature parameter of the core material by selecting crystalline polyester with a melting point of 30°C to 130°C, which is above room temperature. This parameter change transforms the core from a liquid state at room temperature to a solid crystalline state, enabling cold pressure fix operation while preventing leakage of the core material
3Reliability
If high pressure is applied, then toner fixing is achieved, but pressure-dependent viscosity transitions are not efficiently managed
Solution Approach 1:
The patent utilizes the phase transition properties of crystalline polyester, which melts at a specific temperature range (30°C to 130°C). Under applied pressure, this phase transition occurs at lower temperatures and pressures than conventional materials, efficiently managing the viscosity transitions required for toner fixing without requiring excessive pressure
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 toner fixing at reduced pressures, improving image robustness and preventing leakage by achieving a viscosity transition suitable for cold pressure fixing, allowing for efficient toner flow and adhesion to substrates at room temperature under applied pressure, while maintaining stability at low pressures.
Implementation Method 1
at least one crystalline polyester material having a melting point in a range from 30 °C to 130 °C
Implementation Method 2
at least one C16 to C80 amorphous organic material having a Tg of from -30 °C to 70 °C
Data Source
Figure 1~2A
Figure 2B~3
AI summary
A cold pressure fix toner composition includes at least one crystalline polyester material having a melting point in a range from about 30 °C to about 130 °C and at least one C16 to C80 amorphous organic material having a Tg of from about -30 °C to about 70 °C. A method of cold pressure fix toner application includes providing the cold pressure fix toner composition, disposing the cold pressure fix toner composition on a substrate, and applying pressure to the disposed composition on the substrate under cold pressure fixing conditions. A latex can be formed from the cold pressure fix toner composition.