Polyester Resin Composition with Pyrolysis Peak Control for Toner Stability
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Solution Overview
Problem
Existing polyester resin compositions with high bisphenol A content exhibit poor heat-resistant storage stability and low crushing resistance, leading to toner deformation and scattering issues in developing devices.
Innovation Solution
A polyester resin composition with controlled pyrolysis gas chromatography peaks and inclusion of boron, aluminum, and phosphorus elements to enhance low-temperature fixability, heat-resistant storage stability, and crushing resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a polyester composition with high bisphenol derivative content is used, then low-temperature fixability is improved, but heat-resistant storage stability deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the polyester by controlling the content of bisphenol derivative components to 5-30 mass% and introducing specific monomer components (polyester polyol with 1,3-propanediol or 1,4-butanediol, and polyester polyacid with 1,3-propanediol or 1,4-butanediol). This parameter optimization allows achieving both low-temperature fixability and heat-resistant storage stability simultaneously.
2Temperature
If a polyester composition with high bisphenol derivative content is used, then low-temperature fixability is improved, but crushing resistance of toner deteriorates
Solution Approach 1:
The patent optimizes the composition parameters by limiting bisphenol derivative content to 5-30 mass% and incorporating specific monomers (1,3-propanediol or 1,4-butanediol based polyester polyol and polyacid) to improve the molecular structure and physical properties of the polyester, thereby enhancing toner crushing resistance while maintaining low-temperature fixability.
Solution Approach 2:
The patent creates a composite polyester system combining multiple monomer components (bisphenol derivatives, 1,3-propanediol or 1,4-butanediol based polyols, and 1,3-propanediol or 1,4-butanediol based polyacids) to achieve a balanced material with both good low-temperature fixability and high crushing resistance.
3Ease of manufacture
If a polyester composition with low crushing resistance is used, then manufacturing cost is reduced, but toner scattering and fogging increase
Solution Approach 1:
The patent changes the polyester composition parameters by incorporating specific monomers (1,3-propanediol or 1,4-butanediol based polyol and polyacid) that improve molecular chain flexibility and intermolecular forces, thereby enhancing toner integrity and preventing scattering and fogging while maintaining cost-effective manufacturing.
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 composition achieves improved low-temperature fixability, heat-resistant storage stability, and crushing resistance, preventing toner deformation and scattering, while maintaining toner quality.
Implementation Method 1
a total number N of peaks having a retention time shorter than or equal to a retention time of 4,4'-dihydroxybiphenyl is 1 to 17, and the polyester resin composition further comprises at least one element selected from boron, aluminum, and phosphorus
Data Source
AI summary
Disclosed is a polyester resin composition including a polyester resin. Among top 20 peaks in relative abundance in a chromatogram obtained by pyrolysis gas chromatography mass spectrometry, a total number N of peaks having a retention time shorter than or equal to a retention time of 4,4′-dihydroxybiphenyl is 1 to 17, and the polyester resin composition further includes at least one element selected from boron, aluminum, and phosphorus.