Black Toner Composition for Low-Temperature Fixing Without Blank Dots
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Solution Overview
Problem
Existing black toners suffer from cold offset and blank dots when printing on plain paper due to insufficient adhesion to the paper surface, particularly in areas with uneven pressure application.
Innovation Solution
A black toner formulation comprising a binder resin with a vinyl resin monomer unit, carbon black, hydrocarbon wax, and phthalocyanine compounds, which enhances adhesion and prevents wax crystallization, ensuring proper toner release and image fidelity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a styrene-acrylic resin with long-chain alkyl (meth)acrylate is used as binder resin, then melting characteristics are improved and cold offset is reduced, but toner adhesion to paper deteriorates causing blank dots
Solution Approach 1:
The patent uses a composite binder resin system comprising both styrene-acrylic resin (for low-temperature melting) and polyester resin (for adhesion). This composite approach allows the toner to achieve both low-temperature fixability and reliable adhesion to paper, resolving the contradiction between improved melting characteristics and maintained toner adhesion.
2Temperature
If hydrocarbon wax is added to improve low-temperature fixability, then melting characteristics are enhanced, but wax crystallization occurs causing blank dots
Solution Approach 1:
The patent introduces a specific wax inhibitor substance that acts as an intermediary agent to prevent wax crystallization. This inhibitor interferes with the crystallization process of hydrocarbon wax, allowing the wax to maintain its amorphous state and provide low-temperature fixability without causing blank dots or image defects.
Solution Approach 2:
The patent modifies the physical-chemical parameters of the wax by adding specific inhibitors that change the crystallization behavior. This parameter change prevents the wax from forming crystals during fixing, thereby maintaining image uniformity while preserving low-temperature fixability.
3Use of energy by stationary object
If toner is designed for low-temperature fixing, then power consumption is reduced, but adhesion to uneven paper surfaces deteriorates
Solution Approach 1:
The patent employs a composite resin system combining styrene-acrylic resin (for low-temperature processing) with polyester resin (for adhesion). This composite material approach enables the toner to fix at lower temperatures while maintaining sufficient adhesion to uneven paper surfaces, thus reducing power consumption without sacrificing image quality.
Solution Approach 2:
The patent applies local quality enhancement by incorporating wax inhibitor substances specifically at the toner-paper interface. This localized modification ensures that the wax remains amorphous and provides proper adhesion in critical areas like recesses, while maintaining overall low-temperature fixability.
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 effectively suppresses cold offset and blank dots by improving toner adhesion and release characteristics, allowing for high-density image output on plain paper with reduced heat consumption.
Implementation Method 1
a binder resin, a hydrocarbon wax, and carbon black
Implementation Method 2
which enhances adhesion and prevents wax crystallization
Implementation Method 3
pressure from a fixing film is difficult to apply
Implementation Method 4
the decrease in the amount of heat applied to a fixing device
Data Source
AI summary
A black toner has a black toner particle having a binder resin, a hydrocarbon wax, and carbon black, the black toner particle further contains at least one selected from the group consisting of copper phthalocyanine and zinc phthalocyanine, and the binder resin includes a vinyl resin having a specific monomer unit having a linear alkyl group with 8 to 22 carbon atoms.