Toner Particles With Silica Additives For Durability
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Solution Overview
Problem
Existing electrostatic charge image developing toners face issues with development durability and cleaning properties due to the embedding and movement of external additives, leading to increased cleaning requirements and potential image defects.
Innovation Solution
The use of silica particles with specific size, circularity, and shape characteristics as external additives, which inhibit embedding and movement, enhancing development durability and cleaning efficiency by preventing excessive additive loss and improving transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional external additives are used in toner, then development durability is improved, but cleaning properties deteriorate due to embedding and movement of additives
Solution Approach 1:
The patent applies parameter changes by precisely controlling the particle size (100-500 nm), circularity (0.5-0.85), and shape characteristics (Da/H ratio of 1.5-1.9) of silica particles. These parameter optimizations prevent the additives from embedding and moving during image formation, thereby maintaining development durability while improving cleaning properties by reducing additive loss.
Solution Approach 2:
The patent uses composite materials by combining silica particles with specific physical characteristics as external additives in the toner formulation. The silica particles with controlled size, shape, and circularity create a composite structure that maintains stability during image formation while improving cleaning efficiency.
2Reliability
If external additives are added to toner particles, then development durability is enhanced, but the amount of additives required for cleaning increases
Solution Approach 1:
The patent optimizes the parameters of silica particles including size (100-500 nm), circularity (0.5-0.85), and shape (Da/H ratio 1.5-1.9) to reduce the quantity of additives needed. The specific shape characteristics prevent excessive additive loss during cleaning, thereby reducing the amount of additives required while maintaining development durability.
3Reliability
If external additives move and embed in toner particles, then development durability is affected, but image defects occur
Solution Approach 1:
The patent changes the physical parameters of external additives by specifying silica particles with controlled size (100-500 nm), circularity (0.5-0.85), and shape characteristics (Da/H ratio 1.5-1.9). These parameter optimizations prevent embedding and movement of additives during image formation, thereby preventing image defects while maintaining development durability.
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 development durability and cleaning properties by maintaining the structural integrity of the external additives on the toner particles, reducing the amount of additives required for cleaning and preventing image defects, while maintaining transfer efficiency and fixing temperature range.
Implementation Method 1
causing the aggregated particles to coalesce by heating an aggregated particle dispersion in which the aggregated particles are dispersed so as to form the toner particles
Data Source
AI summary
An electrostatic charge image developing toner includes toner particles, and an external additive. The toner particles are (1) prepared by forming aggregated particles by aggregating resin particles in a raw material dispersion in which the resin particles are dispersed, and causing the aggregated particles to coalesce by heating an aggregated particle dispersion in which the aggregated particles are dispersed so as to form the toner particles, or (2) obtained by kneading and pulverizing a material including a binder resin and a release agent, and the external additive is silica particles having an average diameter in the range of 100 nm to 500 nm, an average circularity in the range of 0.5 to 0.85, and an average of a ratio of a circle-equivalent diameter Da obtained by plane image analysis to a maximum height H obtained by 3-D image analysis of greater than 1.5 and less than 1.9.