Toner Formulation with Inorganic Additive for Electrostatic Stability
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Solution Overview
Problem
Toner contamination and instability in photocopiers due to electrostatic issues lead to reduced low-temperature fixability and heat-resistant storage stability, with existing additives either failing to prevent contamination or hindering fixing processes.
Innovation Solution
A toner formulation with a mother particle containing resin, colorant, and wax, along with an inorganic external additive on its surface, where specific liberation ratios and coverage ratios are optimized to enhance electrostatic stability, durability, and resistance to filming, while minimizing contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If low-melting-point materials are used to enhance low-temperature fixability, then low-temperature fixability is improved, but heat-resistant storage stability deteriorates
Solution Approach 1:
The invention divides the toner particle into two distinct functional layers: a core portion containing low-melting-point materials for low-temperature fixing, and a surface layer containing high-melting-point materials for heat-resistant storage stability. This segmentation allows each layer to independently fulfill its specific function without compromising the other.
Solution Approach 2:
Different regions of the toner particle are assigned different material compositions tailored to their specific functional requirements. The core uses low-melting-point materials optimized for fixing, while the surface uses high-melting-point materials optimized for storage stability, creating local quality differentiation throughout the particle structure.
2Reliability
If additives are added to suppress toner scattering, then electrostatic stability is improved, but toner fixing is hindered
Solution Approach 1:
The invention extracts the electrostatic charge control function from bulk additives and relocates it to the surface layer of the toner particle. The surface layer contains specific materials that provide electrostatic stability without the negative effects of traditional additives, thereby maintaining fixing performance while suppressing toner scattering.
3Temperature
If resin fine particles are attached to toner surface to balance low-temperature fixability and heat-resistant storage stability, then low-temperature fixability is improved, but manufacturing complexity increases
Solution Approach 1:
The invention combines multiple functions into a single integrated surface layer structure. The surface layer simultaneously provides heat-resistant storage stability, electrostatic charge control, and suppression of toner scattering, eliminating the need for separate resin fine particle attachments and simplifying the manufacturing process.
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 effectively suppresses contamination, improves heat resistance, and maintains low-temperature fixability, ensuring reliable operation and extended maintenance-free periods in photocopiers.
Implementation Method 1
exhibits excellent electrostatic stability to minimize toner scattering
Implementation Method 2
suppresses contamination of cleaning components and a photoconductor
Data Source
AI summary
A toner contains a mother toner particle containing a resin, a colorant, and a wax andan inorganic external additive on the surface of the mother toner particle, wherein the following relationships are satisfied:20<A≤40Relationship 10≤B-A≤10,Relationship 22.3<C<5.Relationship 3where A (percent by mass) represents the liberation ratio of the inorganic external additive separated by shaking the toner with ultrasonic wave at a power of 20 W and a frequency of 20 kHz for one minute,B (percent by mass) represents the liberation ratio of the inorganic external additive separated by shaking the toner with ultrasonic wave at a power of 60 W and a frequency of 20 kHz for one minute, andC (percent by mass) represents the proportion of the inorganic external additive to the toner.