Toner Composition with Shape-Controlled Additives for Stable Fluidity
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Solution Overview
Problem
Existing toners experience issues with spherical external additives migrating and causing image defects such as image streaks and image fogging due to decreased fluidity over long-term use, despite their ability to improve toner fluidity through planar contact.
Innovation Solution
A toner formulation with a resin A containing silicon, where the external additive has specific shape factors and is bonded with the toner particle surface through electrostatic interactions, preventing migration and maintaining fluidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If spherical external additives are used to improve toner fluidity through planar contact, then fluidity is improved, but the external additives detach and migrate during long term use
Solution Approach 1:
The invention uses a composite external additive comprising both spherical particles and fine particles. The spherical particles provide planar contact for improved fluidity, while the fine particles fill gaps and enhance adhesion to the toner particle surface. This composite structure prevents detachment and migration during long term use while maintaining fluidity benefits.
Solution Approach 2:
The fine particles act as an intermediary between the spherical external additive and the toner particle surface. They improve the bonding between the spherical particles and the toner surface, preventing detachment. The fine particles effectively mediate the interaction between the spherical additives and the toner, ensuring stable attachment while preserving the fluidity-enhancing properties of the spherical shape.
2Reliability
If mechanical impacts are applied to fix external additive to toner particle surface, then external additive attachment is improved, but spherical external additive itself migrates due to dispersed mechanical impacts
Solution Approach 1:
The invention changes the particle size parameter by introducing fine particles in addition to spherical external additives. The fine particles have smaller size that allows them to fill gaps and bond more effectively to the toner surface, improving attachment without requiring strong mechanical impacts that would cause migration of spherical particles.
Solution Approach 2:
The composite structure of spherical particles combined with fine particles allows the fine particles to bear the brunt of mechanical bonding to the toner surface, while the spherical particles maintain their position through the supporting network created by the fine particles. This division of functional roles prevents migration while ensuring stable attachment.
3Ease of operation
If spherical external additive is used to act as bearing for improving fluidity, then fluidity is improved, but detachment occurs during long term use causing image defects
Solution Approach 1:
The invention converts the potential harm of spherical particle detachment into a benefit by adding fine particles that prevent detachment. The fine particles create a stable bonding network that secures the spherical particles, transforming what would be a harmful migration issue into a stable, long-lasting external additive system that maintains fluidity without causing image defects.
Solution Approach 2:
The composite external additive system combines the fluidity-enhancing spherical particles with the surface-anchoring fine particles. This composite structure ensures that the spherical particles remain attached during long term use, preventing the detachment that would otherwise cause image streaks and fogging, while preserving the bearing function that improves fluidity.
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 detachment of spherical external additives, reducing image streaks and fogging by enhancing adhesion and electrostatic interactions, thereby maintaining fluidity and image quality over extended use.
Implementation Method 1
the external additive has specific shape factors and is bonded with the toner particle surface through electrostatic interactions, preventing migration and maintaining fluidity
Data Source
AI summary
A toner comprising a toner particle comprising a resin A, and an external additive A, wherein the resin A is a resin represented by formula (1) below, the resin A is present at the surface of the toner particle, the external additive A is a fine particle containing silicon, the average value of the shape factor SF-1 of the external additive A is from 105 to 120, the average value of the shape factor SF-2 of the external additive A is from 100 to 130.