Amorphous Polyester Toner with Tin Titanium Catalyst
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Solution Overview
Problem
Current toners for electrophotographic systems face challenges in achieving low-temperature fixability while maintaining hot offset resistance and fixing wraparound resistance, especially at high temperatures, due to limitations in binder resin properties such as glass transition temperature and molecular weight.
Innovation Solution
A toner containing an amorphous polyester with a specific Sn/Ti abundance ratio of 20/80 to 80/20, where the weight-average molecular weight is less than 7,000, incorporating tin and titanium compounds to enhance crosslinking reactions, thereby improving hot offset and fixing wraparound resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the glass transition temperature and softening point of the binder resin are lowered to achieve low-temperature fixability, then the fixing temperature can be reduced, but the hot offset resistance and fixing wraparound resistance deteriorate
Solution Approach 1:
The invention changes the chemical composition parameters of the binder resin by incorporating specific ratios of saturated polyester resin (5-30 mass%) and unsaturated polyester resin (70-95 mass%), along with controlling the glass transition temperature to 40-65°C and softening point to 75-120°C. This parameter optimization enables low-temperature fixing while maintaining hot offset resistance through the balanced resin composition and controlled thermal properties.
Solution Approach 2:
The invention uses a composite binder resin system combining two different polyester resin types with complementary properties. The saturated polyester resin contributes to low-temperature fixability, while the unsaturated polyester resin provides hot offset resistance. This composite material approach allows simultaneous achievement of low fixing temperature and high temperature resistance.
2Temperature
If the glass transition temperature and softening point of the binder resin are lowered to achieve low-temperature fixability, then the fixing temperature can be reduced, but the fixing wraparound resistance deteriorates
Solution Approach 1:
The invention optimizes thermal parameters by controlling the glass transition temperature to 40-65°C and softening point to 75-120°C, while adjusting the resin composition to achieve proper melting characteristics. This parameter control enables the toner to melt and fix at lower temperatures while maintaining wraparound resistance through appropriate viscosity and flow properties during the fixing process.
Solution Approach 2:
The composite polyester resin system provides differentiated functional contributions where the saturated component facilitates low-temperature melting and the unsaturated component maintains structural integrity and wraparound resistance, achieving both low-temperature fixability and reliable fixing performance.
3Temperature
If the molecular weight of the polyester resin is reduced to achieve sharp melt property, then the low-temperature fixability is improved, but the hot offset resistance and fixing wraparound resistance are reduced
Solution Approach 1:
The invention changes the molecular weight parameters by using polyester resins with weight-average molecular weights of 5,000-20,000 (saturated) and 3,000-15,000 (unsaturated), which provides sharp melt properties for low-temperature fixing. Simultaneously, the specific resin composition and crosslinking agents maintain hot offset resistance by controlling the resin's thermal stability and adhesion properties.
Solution Approach 2:
The composite resin system balances molecular weight effects by combining lower molecular weight components (for sharp melting) with higher molecular weight components and crosslinking structures (for hot offset resistance), achieving both rapid melting at low temperatures and stable performance at high temperatures.
4Temperature
If the molecular weight of the polyester resin is reduced to achieve sharp melt property, then the low-temperature fixability is improved, but the fixing wraparound resistance is reduced
Solution Approach 1:
The invention optimizes molecular weight parameters to achieve sharp melt properties (Mw: 5,000-20,000 for saturated, 3,000-15,000 for unsaturated polyester resins) that enable low-temperature melting, while controlling the resin composition and adding crosslinking agents to maintain appropriate viscosity and adhesion characteristics that prevent wraparound during the fixing process.
Solution Approach 2:
The composite polyester resin system combines components with different molecular weights and properties, where the lower molecular weight components provide sharp melting for low-temperature fixing, while the overall composition and crosslinking structures maintain the viscosity and adhesion needed to prevent wraparound and ensure reliable fixing.
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 low-temperature fixability, hot offset resistance, and fixing wraparound resistance, ensuring broad fixable temperature ranges and stable performance.
Implementation Method 1
the amorphous polyester contains a tin compound and a titanium compound
Data Source
AI summary
A toner comprises a toner particle containing an amorphous polyester, wherein the amorphous polyester contains an amorphous polyester 1, the amorphous polyester contains a tin compound and a titanium compound, a Sn/Ti abundance ratio between Sn and Ti in the amorphous polyester according to x-ray fluorescence analysis is 20/80 to 80/20, and a weight-average molecular weight Mw1 of the amorphous polyester 1 according to measurement by gel permeation chromatography (GPC) is Mw1<7,000.