Two-Component Developer Coating for Low-Temp Fixing Stability
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Solution Overview
Problem
Existing toners for electrostatic latent image development face challenges in achieving both heat-resistant storability and low-temperature fixability, with issues such as coagulation at high temperatures and poor adhesion to recording media due to inadequate shell layer thickness and external additive detachment.
Innovation Solution
A two-component developer comprising a toner with a core-shell structure, where the core is coated with a resin containing an acrylic resin shell layer, and external silicone-modified acrylic resin particles with controlled detachment during ultrasonic treatment, combined with a carrier having a silicone resin coat, enhances adhesion and fixability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a thin shell layer is used to enable low-temperature fixability, then fixability is improved, but heat-resistant storability deteriorates due to coagulation
Solution Approach 1:
The toner particle is segmented into a core region and a shell layer with distinct functional compositions. The core contains the binder resin and colorant for basic toner functions, while the shell layer contains silicone-modified acrylic resin particles (40-140 nm) that provide heat resistance and prevent coagulation during storage, yet allow low-temperature fixing when melted during the imaging process
Solution Approach 2:
The shell layer is formed as a composite material combining acrylic resin with externally added silicone-modified acrylic resin particles. This composite structure provides both the adhesion properties of acrylic resin and the heat-resistant anti-coagulation properties of silicone-modified particles, enabling the toner to maintain stability at high temperatures during storage while remaining fixable at lower temperatures during imaging
2Ease of operation
If external additives are added to improve flowability and charging performance, then toner performance is improved, but additive detachment and liberation increase
Solution Approach 1:
A thin shell layer (5-50 nm) containing silicone-modified acrylic resin particles is formed on the toner core. This thin protective film allows the external additives to maintain their functional properties for flowability and charging while preventing their detachment and liberation during handling and imaging processes
Solution Approach 2:
The silicone-modified acrylic resin particles in the shell layer have a controlled particle diameter of 40-140 nm, which optimizes the balance between providing sufficient coverage to prevent additive liberation and maintaining thinness to allow functional performance. This precise parameter control minimizes additive detachment while preserving toner performance
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 provides improved cleaning properties and transfer efficiency, ensuring high-quality image formation with reduced external additive liberation, maintaining image quality over extended periods.
Implementation Method 1
a toner and a carrier capable of positively charging the toner by friction
Implementation Method 2
an ultrasonic treatment involving application of ultrasonic oscillation at an output power of 100 W and a frequency of 28 kHz
Data Source
AI summary
A two-component developer includes a positively chargeable toner and a carrier. The toner includes a toner base particle including a toner core particle and a shell layer formed of a resin containing an acrylic resin and an external additive. A surface of the carrier is coated with a resin coat layer containing a silicone resin. The external additive contains silicone-modified acrylic resin particles having a volume average particle diameter of not less than 40 nm and not more than 140 nm. When there is executed an ultrasonic treatment involving application of ultrasonic oscillation at an output power of 100 W and a frequency of 28 kHz for 1 minute in an aqueous dispersion liquid containing the toner and a nonionic surfactant, an amount of those particles among the silicone-modified acrylic resin particles which become detached from the toner base particle and liberated is not more than 0.35% by mass.