Toner Composition Compatibility Parameter for Low-Temperature Fixing
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Solution Overview
Problem
Existing toners face challenges in achieving low-temperature fixability, heat-resistant storability, and durability due to separation of binder resin and crystalline material during melting, leading to poor image quality and durability issues during high-speed printing.
Innovation Solution
A toner composition with a styrene-acrylic resin and crystalline resin, where the compatibility parameter between the two is controlled within a specific range (0.40≦V≦1.10) to ensure uniform compositional state and prevent separation, enhancing colorant dispersibility and low-temperature fixability while maintaining heat-resistant storability and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a crystalline material is introduced into a toner to lower the glass transition temperature and improve low-temperature fixability, then the fixing performance is improved, but the binder resin and crystalline material separate during melting, causing deterioration in colorant dispersibility and image quality
Solution Approach 1:
The invention changes the chemical composition parameters of the binder resin by selecting specific resin combinations (styrene-acrylic resin with Tg of 50-90°C and carboxyl-containing resin with Tg of -50-50°C) and controlling their ratios, along with the compatibility parameter V between binder resin and crystalline material, to achieve both low-temperature fixability and compositional stability during melting
Solution Approach 2:
The invention uses a composite binder resin system combining styrene-acrylic resin and carboxyl-containing resin in specific proportions, along with a crystalline material, to create a multi-component system where each component contributes specific properties: the styrene-acrylic resin provides structural framework, the carboxyl-containing resin enhances compatibility and dispersibility, and the crystalline material enables low-temperature melting while maintaining stability
2Temperature
If a crystalline block resin is used as the binder resin to achieve low-temperature fixing, then the glass transition temperature is lowered, but the crystalline material is present at the toner surface and exhibits brittleness, causing poor durability during continuous high-speed printing
Solution Approach 1:
The invention applies local quality by creating a differentiated structure where the binder resin composition is optimized in different regions: the core contains the styrene-acrylic resin providing structural integrity, while the interface regions contain carboxyl-containing resin that enhances compatibility with crystalline material, resulting in improved durability while maintaining low glass transition temperature
Solution Approach 2:
The invention changes the molecular and compositional parameters of the binder resin by selecting specific resin types with controlled Tg values and controlling the compatibility parameter V, transforming the brittle crystalline structure into a more ductile composite system that maintains reliability during high-speed printing
3Temperature
If an amorphous component is introduced through graft polymerization into a crystalline material to improve low-temperature fixing, then the glass transition temperature is reduced, but crosslinking reactions increase the molecular weight and fail to solve the problem
Solution Approach 1:
The invention extracts the amorphous component from the crystalline material structure and replaces it with a separate carboxyl-containing resin component in the binder resin system, avoiding the complexity of graft polymerization and crosslinking while achieving the desired glass transition temperature reduction and improved compatibility
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 controlled compatibility parameter between the styrene-acrylic resin and crystalline resin ensures excellent colorant dispersibility, high-quality image formation, and improved low-temperature fixability, along with satisfactory heat-resistant storability and durability, addressing the limitations of previous toner technologies.
Implementation Method 1
A property of crystalline materials is that they exhibit almost no change in viscosity up to the melting point and then melt all at once when the melting point is exceeded (a sharp melt property)
Implementation Method 2
a compatibility parameter (V) between the styrene-acrylic resin and the crystalline resin satisfies 0.40≦V≦1.10
Data Source
AI summary
The present invention provides a toner that exhibits an excellent colorant dispersibility and hence maintains the formation of a high-quality image, that is capable of low-temperature fixing, and that has a satisfactory heat-resistant storability and a satisfactory durability, in which the toner comprising a toner particle that contains a colorant and a binder resin containing a styrene-acrylic resin and a crystalline resin, wherein a compatibility parameter (V) between the styrene-acrylic resin and the crystalline resin satisfies 0.40≦V≦1.10.