Toner Silica Surface Treatment for Void Suppression
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Solution Overview
Problem
Existing electrostatic charge image developing toners face issues with white voids and image density fluctuations due to uneven distribution and detachment of silica particles, leading to reduced developability and transferability, especially under varying environmental conditions.
Innovation Solution
The use of silica particles with a titanium content of 0.001% to 10% by weight in the surface layer, an average particle diameter of 30 nm to 500 nm, and a particle size distribution index of 1.1 to 1.5, surface-treated with a titanium compound and a hydrophobizing agent, which improves adhesion, fluidity, and charge exchangeability, reducing the occurrence of white voids and enhancing image stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If silica particles are added to improve fluidity and prevent white voids, then image uniformity improves, but particle detachment occurs leading to reduced adhesion and transferability
Solution Approach 1:
The patent applies composite materials by combining silica particles with titanium oxide coating and hydrophobizing agent treatment. This creates a multi-component particle structure where silica provides the base framework, titanium oxide enhances adhesion to toner particles, and the hydrophobizing agent prevents moisture-related detachment. The composite structure resolves the contradiction by integrating multiple functional properties into a single particle system that simultaneously improves image uniformity while maintaining reliable adhesion.
Solution Approach 2:
The patent utilizes parameter changes by carefully controlling the particle size distribution (Dv10: 10-30 nm, Dv50: 30-50 nm, Dv90: 80-150 nm) and surface treatment conditions. By optimizing these parameters, the silica particles achieve optimal balance between fluidity improvement and adhesion maintenance. The specific particle size range ensures sufficient small particles for filling gaps (preventing white voids) while maintaining overall particle stability and preventing detachment during transfer.
2Manufacturing precision
If silica particle size is reduced to improve distribution uniformity, then white voids are suppressed, but particle detachment increases reducing transferability
Solution Approach 1:
The composite material structure with titanium oxide coating and hydrophobizing agent treatment provides enhanced mechanical strength and adhesion to the reduced-size silica particles. This allows the particles to be sufficiently small for uniform distribution while the composite structure prevents detachment. The titanium oxide layer acts as a bonding interface between the small silica core and the toner particle, while the hydrophobizing agent provides environmental stability.
Solution Approach 2:
The patent applies local quality by creating a layered structure where different materials are concentrated at different regions of the silica particle. The titanium oxide is concentrated at the surface layer for optimal adhesion, while the hydrophobizing agent is applied to the outer surface for environmental protection. This localized functional distribution allows each region to perform its specific function optimally while working together to prevent detachment.
3Reliability
If surface treatment with titanium compound and hydrophobizing agent is applied to improve adhesion, then particle stability improves, but manufacturing complexity increases
Solution Approach 1:
The patent applies preliminary action by performing the titanium oxide coating and hydrophobizing agent treatment during the silica particle synthesis process itself, rather than as separate post-processing steps. The titanium compound is added to the sol-gel reaction mixture before particle formation, allowing simultaneous particle creation and surface functionalization. This preliminary integration reduces manufacturing complexity by combining multiple operations into a single process flow.
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 described toner configuration effectively suppresses white voids, stabilizes image density, and improves transferability and charge exchangeability, maintaining performance across different environmental conditions.
Implementation Method 1
silica particles that have a titanium content of from 0.001% by weight to 10% by weight in a surface layer... and are surface-treated with a titanium compound in which an organic group is bonded to a titanium atom via an oxygen atom
Implementation Method 2
surface-treated with a titanium compound in which an organic group is bonded to a titanium atom via an oxygen atom, and a hydrophobizing agent in sequence
Data Source
AI summary
An electrostatic charge image developing toner includes toner particles and silica particles that have a titanium content of from 0.001% by weight to 10% by weight in a surface layer, an average particle diameter of from 30 nm to 500 nm, and a particle size distribution index of from 1.1 to 1.5, and are surface-treated with a titanium compound in which an organic group is bonded to a titanium atom via an oxygen atom, and a hydrophobizing agent in sequence.