Toner Composition Using SrTiO3-Silica Control for Stable Charging
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Solution Overview
Problem
Existing toners using hydrotalcite and silica particles face issues with hydrotalcite concentration leading to excessive chargeability in low-temperature and low-humidity environments, causing ghosting and member contamination, while maintaining stable chargeability in high-temperature and high-humidity environments is challenging.
Innovation Solution
A toner formulation incorporating strontium titanate fine particles with controlled Si/Sr mass ratio (0.2≤Si/Sr≤0.6) at the surface, along with silica and hydrotalcite particles, to electrostatically repel silica and suppress hydrotalcite aggregation, ensuring stable charge build-up across varying environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrotalcite is disposed with a high degree of freedom at the surface of the toner, then chargeability is improved, but hydrotalcite concentration occurs during long-term use causing excessive chargeability and ghosting
Solution Approach 1:
Silica fine particles are introduced as intermediary materials between the toner particle surface and hydrotalcite particles. The silica particles have high adhesion to the toner surface and provide anchoring points for hydrotalcite, preventing its concentration while maintaining chargeability. The silica acts as a mediator that holds hydrotalcite in a dispersed state without reducing its carrier function.
Solution Approach 2:
The invention uses a composite structure combining silica fine particles and hydrotalcite particles on the toner surface. This composite material approach allows the silica to provide structural support and dispersion stability while hydrotalcite provides chargeability, achieving both reliability and compositional stability simultaneously.
2Stability of the object's composition
If adhesion of hydrotalcite to the toner surface is enhanced to prevent concentration, then distribution stability is improved, but the carrier function of hydrotalcite deteriorates
Solution Approach 1:
Silica fine particles serve as intermediary materials that provide adhesion to the toner surface while maintaining hydrotalcite mobility. The silica particles are firmly attached to the toner but provide a interface that allows hydrotalcite to maintain its carrier function without being overly constrained.
3Reliability
If silica fine particles are used to improve fluidity and charge build-up, then chargeability is improved, but silica adheres to hydrotalcite causing aggregation and member contamination
Solution Approach 1:
The invention introduces an intermediary layer or structure between silica and hydrotalcite that prevents direct adhesion. The silica particles are positioned or structured such that they interact with the toner surface and hydrotalcite through controlled interfaces, reducing direct silica-hydrotalcite contact that causes aggregation and contamination.
4Adaptability or versatility
If hydrotalcite and silica are jointly used to achieve stable chargeability in high-temperature high-humidity environments, then charge build-up is improved, but hydrotalcite concentration occurs in low-temperature low-humidity environments causing overcharge and ghosting
Solution Approach 1:
Silica fine particles act as intermediary materials that provide consistent performance across different environmental conditions. In high-temperature high-humidity environments, they support charge build-up, while in low-temperature low-humidity environments, they prevent hydrotalcite concentration, thereby maintaining charge control and preventing overcharge and ghosting.
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 stable charge build-up in high-temperature and high-humidity environments and prevents overcharge in low-temperature and low-humidity environments, reducing ghosting and member contamination, thereby ensuring excellent image quality.
Implementation Method 1
the inorganic fine particle contains a strontium titanate fine particle A, a silica fine particle B, and a hydrotalcite particle C... to electrostatically repel silica
Implementation Method 2
a value Si/Sr of a mass ratio of Si to Sr, which is detected in a fluorescent X-ray analysis of the strontium titanate fine particle A
Data Source
AI summary
A toner including: a toner particle containing a binder resin; and an inorganic fine particle, wherein the inorganic fine particle contains a strontium titanate fine particle A, a silica fine particle B, and a hydrotalcite particle C, Si is present at a surface of the strontium titanate fine particle A, and a value Si/Sr of a mass ratio of Si to Sr, which is detected in a fluorescent X-ray analysis of the strontium titanate fine particle A, satisfies the following formula (1); 0.20≤Si/Sr≤0.60 . . . (1).