White Toner Pigment Circularity for Adhesion and Hiding
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Solution Overview
Problem
The color reproducibility of colored images is compromised when a white toner with high pigment content is used on curved recording media, leading to decreased adhesion between the white and colored images, especially under mechanical stress and increased thickness or pigment amount, resulting in unsatisfactory hiding properties.
Innovation Solution
A white toner with white pigment particles having high circularity and a narrow circularity distribution, as determined by specific formulas, is used to ensure excellent light scattering and adhesion, even in curved states, without the need for increased thickness or pigment amounts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the amount of white pigment is increased to improve hiding properties, then light scattering ability is enhanced, but adhesion between white image and colored image decreases
Solution Approach 1:
The invention changes the shape parameter of white pigment particles from irregular to substantially spherical, achieving a circularity of 0.90 or more. This shape modification improves light scattering efficiency per unit volume, allowing adequate hiding properties with reduced pigment quantity, thereby maintaining adhesion. The spherical shape also improves flowability and packing density of the toner particles.
2Illumination intensity
If the thickness of white image is increased to improve hiding properties, then light reflection is enhanced, but adhesion between images decreases
Solution Approach 1:
The invention modifies the shape parameter of white pigment particles to be substantially spherical with circularity of 0.90 or more, which enhances light scattering efficiency. This allows achieving adequate hiding properties with a thinner white image layer, reducing the thickness while maintaining both hiding properties and adhesion to the colored image.
3Illumination intensity
If relative amount of binder resin is decreased to increase white pigment content, then hiding properties are improved, but adhesion between images deteriorates
Solution Approach 1:
The invention changes the shape parameter of white pigment particles to substantially spherical with circularity of 0.90 or more, improving light scattering efficiency per unit mass. This allows maintaining adequate hiding properties with a lower proportion of white pigment, enabling a higher binder resin content that ensures good adhesion between the white and colored images.
4Illumination intensity
If white pigment with high refractive index is used to improve hiding properties, then light scattering is enhanced, but adhesion between images decreases
Solution Approach 1:
The invention modifies the shape parameter of white pigment particles from irregular to substantially spherical with circularity of 0.90 or more. This shape change improves light scattering efficiency, allowing the use of white pigment at lower concentrations while maintaining hiding properties, thereby preserving adhesion between images.
5Illumination intensity
If primary particle diameter of white pigment is increased to improve hiding properties, then light scattering is enhanced, but adhesion between images decreases
Solution Approach 1:
The invention changes the shape parameter of white pigment particles to substantially spherical with circularity of 0.90 or more. This shape modification improves light scattering efficiency across a range of particle sizes, allowing optimization of particle diameter for both hiding properties and adhesion performance.
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 white toner maintains excellent hiding properties and color reproducibility on curved surfaces by ensuring uniform dispersion and high shape isotropy of the pigment, preventing gaps between images and enhancing the overall image quality.
Implementation Method 1
The hiding properties of the white image are exhibited by reflection of the light incident on the white image without transmission
Data Source
AI summary
A white toner for electrostatic image development includes white toner particles containing a binder resin and a white pigment. When in a circularity distribution of the white pigment determined by sectional observation of the white toner particles, the cumulative 10% circularity from the smaller side is C10, and the cumulative 50% circularity is C50, the following formula (1) and formula (2) are satisfied.0.900≤C50≤1.000 Formula (1):1.00≤C50/C10≤1.13 Formula (2):