Crystalline Polyester Toner for Offset Resistance
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Solution Overview
Problem
Toner containing crystalline polyester has low storage stability and high temperature offset resistance, leading to potential damage to the heating roller and generation of streak images due to its low viscosity and tendency to form hardened products when heated.
Innovation Solution
A toner composition comprising non-crystalline and crystalline polyester with the crystalline polyester not containing an esterification catalyst, maintaining a specific gel content and melting point range, which prevents further polycondensation and maintains high temperature offset resistance while ensuring low temperature fixing capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If crystalline polyester is used to lower the melting point of toner, then low temperature fixing is achieved, but storage stability deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters of the crystalline polyester by excluding esterification catalysts and controlling the molar ratio of specific components (adipic acid: 5-20 mol%, sebacic acid: 5-20 mol%) to achieve both low melting point (80-110°C) and improved storage stability
Solution Approach 2:
The invention uses a composite binder resin system combining crystalline polyester (30-70 wt%) with non-crystalline polyester (10-40 wt%) and polyester wax (5-20 wt%) to achieve synergistic effects that simultaneously provide low fixing temperature and high storage stability
2Temperature
If crystalline polyester with low melting point is used, then low temperature fixing is enabled, but high temperature offset resistance deteriorates
Solution Approach 1:
The invention optimizes the melting point parameter of crystalline polyester to a specific range (80-110°C) and controls the gel content (4-11%) to achieve the balance between low fixing temperature and high temperature offset resistance
Solution Approach 2:
The composite binder resin system combines crystalline polyester for low temperature fixing with polyester wax components that provide high temperature offset resistance, creating a multi-functional material system
3Temperature
If crystalline polyester is used in toner, then low temperature fixing is achieved, but viscosity control deteriorates leading to heating roller damage
Solution Approach 1:
The invention controls the gel content parameter within 4-11% and excludes esterification catalysts from the crystalline polyester to prevent excessive polycondensation and maintain stable viscosity characteristics during heating
Solution Approach 2:
The invention uses polyester wax components that can be easily replaced or replenished to maintain toner performance, reducing the need for complex viscosity control mechanisms
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 excellent storage stability and high temperature offset resistance, preventing damage to the heating roller and minimizing the generation of streak images, even when heated for extended periods.
Implementation Method 1
A melting point of toner containing non-crystalline polyester decreases when a portion of the non-crystalline polyester is replaced with crystalline polyester. Accordingly, when such toner is used in electrophotographic printing, the toner image can be fixed on a recording medium at a relatively low temperature.
Implementation Method 2
A gel content of the toner particles is in the range of 4 to 11% by mass. The crystalline polyester does not contain an esterification catalyst and has a melting point in a range of 80 to 110° C.
Data Source
AI summary
A toner comprises toner particles containing a colorant, non-crystalline polyester, and crystalline polyester. The crystalline polyester does not contain an esterification catalyst and has a melting point in a range of 80 to 110° C. A gel content of the toner particles is in the range of 4 to 11% by mass.