Toner Strontium Titanate Particle Shape Optimization
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Solution Overview
Problem
Existing electrostatic charge image developing toners experience fogging issues immediately after the start-up of image forming devices, particularly due to the shape and size of strontium titanate particles on the toner surfaces, which affect dispersibility and charging performance.
Innovation Solution
The development of an electrostatic charge image developing toner with strontium titanate particles externally added, where the average primary particle diameter is between 30 nm and 100 nm, and the average primary particle circularity is between 0.82 and 0.94, with a cumulative 84% circularity greater than 0.92, enhancing dispersibility and reducing corner exposure to prevent charge concentration and fogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If strontium titanate particles with small average primary particle diameter (30 nm to 100 nm) and specific circularity (0.82 to 0.94) are used, then dispersibility and charging performance are improved, but fogging occurs in images immediately after start-up
Solution Approach 1:
The invention changes the particle size parameters (average primary particle diameter: 30 nm to 100 nm) and shape parameters (average primary particle circularity: 0.82 to 0.94, cumulative 84% circularity: greater than 0.92) of strontium titanate particles to optimize both dispersibility and fog suppression, resolving the contradiction between improved charging performance and fogging prevention
2Reliability
If strontium titanate particles with high circularity (0.82 to 0.94) are used, then corner exposure is reduced and charge concentration is prevented, but fogging still occurs with certain size ranges
Solution Approach 1:
The invention simultaneously optimizes both shape parameters (circularity: 0.82 to 0.94) and size parameters (average primary particle diameter: 30 nm to 100 nm, cumulative 84% circularity: greater than 0.92) to achieve the dual benefit of reduced corner exposure and suppressed fogging, resolving the contradiction between charging performance and fogging
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
This solution effectively suppresses fogging in images formed immediately after the start-up of image forming devices by improving the dispersibility and charging behavior of strontium titanate particles on the toner surfaces, ensuring better image quality.
Implementation Method 1
a strontium titanate particle that is externally added to the toner particle
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
An electrostatic charge image developing toner includes: a toner particle and a strontium titanate particle that is externally added to the toner particle, in which an average primary particle diameter of the strontium titanate particle that is present on a surface of the toner particle is 30 nm or more and 100 nm or less, and average primary particle circularity is 0.82 or more and 0.94 or less, and in which circularity that becomes 84% of accumulation of the primary particle is greater than 0.92.