Crystalline Polyester Resin for Toner with High Young's Modulus
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional crystalline polyester resins used in electrophotographic toners provide excellent fixing performance and blocking resistance but suffer from low mechanical strength and development durability due to their low glass transition temperature and Young's modulus, leading to adhesion issues in developing assemblies.
Innovation Solution
A crystalline polyester resin with a melting point between 60°C and 125°C and a Young's modulus of at least 2 GPa, preferably 3 GPa or higher, is developed to enhance mechanical strength and durability while maintaining sharp melt properties and low-temperature fixability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional crystalline polyester resins with low melting point are used to achieve low-temperature fixability, then fixing performance is improved, but mechanical strength and development durability deteriorate due to low Young's modulus
Solution Approach 1:
The patent applies parameter changes by precisely controlling the melting point of the crystalline polyester resin within 60-125°C and the glass transition temperature within -50-0°C, while maintaining Young's modulus at least 2 GPa. This multi-parameter optimization allows the resin to achieve low-temperature fixability without sacrificing mechanical strength and development durability.
2Stability of the object's composition
If crystalline polyester resins with sharp melt property are used to achieve blocking resistance, then blocking property is improved, but development durability deteriorates due to low mechanical strength
Solution Approach 1:
The patent resolves this contradiction by changing the physical parameters of the polyester resin, specifically setting the melting point between 60-125°C and Young's modulus at least 2 GPa. These parameter changes enable the resin to maintain sharp melt properties for blocking resistance while achieving sufficient mechanical strength for development durability.
3Temperature
If crystalline polyester resins with low glass transition temperature are used to achieve low-temperature fixability, then fixing performance is improved, but development durability deteriorates due to low Young's modulus
Solution Approach 1:
The patent applies parameter changes by optimizing both the glass transition temperature (maintaining it low for fixability) and the Young's modulus (maintaining it at least 2 GPa for durability). This dual parameter control allows the resin to remain flexible at room temperature for good development durability while enabling low-temperature fixation.
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 achieves both excellent development durability and low-temperature fixability by optimizing the crystalline polyester resin's mechanical properties, ensuring improved performance in electrophotographic toners without compromising blocking resistance.
Implementation Method 1
a crystalline polyester resin having a melting point of at least 60°C and not more than 125°C
Implementation Method 2
a Young's modulus as measured by an ultramicro durometer at 25°C of at least 2 GPa
Data Source
AI summary
The present invention provides a crystalline polyester resin which has sharp melt property, can achieve both fixing performance and blocking property and has excellent development durability, in which the crystalline polyester resin for toner which has a Young's modulus as measured by an ultramicro durometer at 25 °C of at least 2 GPa and a melting point of at least 60 °C and not more than 125 °C.