Fluorescent Toner Composition for Strength and Image Reflectance
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Solution Overview
Problem
Existing electrostatic charge image developing toners with fluorescent colorants face issues of reduced bending strength and peelability due to high colorant content, leading to decreased fluorescence intensity and image reflectance.
Innovation Solution
The toner formulation includes a specific range of non-fluorescent and fluorescent organic pigments with defined specific gravities, maintaining a total colorant content between 5% to 20% by mass, ensuring a specific gravity difference of 0.6 or more, and using a core/shell structure to enhance bending resistance and reflectance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high content of organic colorant is used to enhance fluorescence intensity, then fluorescence intensity is improved, but bending strength and peelability deteriorate
Solution Approach 1:
The patent changes the specific gravity parameter of the organic colorant to D1≥2.0 and controls the content ratio between non-fluorescent and fluorescent pigments. This parameter optimization allows achieving adequate fluorescence intensity while maintaining bending strength and peelability by preventing excessive colorant aggregation that would harm mechanical properties.
Solution Approach 2:
The patent uses a composite approach by combining non-fluorescent organic pigment and fluorescent organic pigment in specific proportions (content of non-fluorescent pigment:content of fluorescent pigment = 95:5 to 50:50 by mass). This composite colorant system balances fluorescence intensity with mechanical properties, as the non-fluorescent pigment provides structural support while the fluorescent pigment provides optical performance.
2Illumination intensity
If high content of organic colorant is used to enhance fluorescence intensity, then fluorescence intensity is improved, but image reflectance deteriorates
Solution Approach 1:
The patent optimizes the specific gravity parameter D1 of the non-fluorescent organic pigment to be ≥2.0 and controls the colorant content ratio. This parameter control ensures that the colorant particles are sufficiently dense to maintain good reflectance while containing enough fluorescent material for adequate fluorescence intensity.
Solution Approach 2:
The composite colorant system combines non-fluorescent and fluorescent pigments in controlled ratios. The non-fluorescent pigment with high specific gravity provides good light reflection and scattering, while the fluorescent pigment provides fluorescence. This composite approach balances reflectance and fluorescence intensity.
3Stability of the object's composition
If specific gravity difference between non-fluorescent and fluorescent pigments is small, then dispersion homogeneity is improved, but bending resistance and peelability deteriorate
Solution Approach 1:
The patent sets the specific gravity D1 of the non-fluorescent organic pigment to be ≥2.0 and controls the difference D1-D2≥0.6 with the fluorescent pigment. This specific gravity differentiation creates sufficient density contrast for proper particle separation and distribution during toner formation, ensuring both dispersion homogeneity and mechanical strength.
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 results in images with improved bending resistance, peelability, and high reflectance, maintaining fluorescence intensity and excellent hue reproducibility.
Implementation Method 1
the organic colorant includes a non-fluorescent organic pigment and a fluorescent organic pigment
Data Source
AI summary
An electrostatic charge image developing toner contains toner particles that contain an organic colorant and a binder resin, in which the organic colorant includes a non-fluorescent organic pigment and a fluorescent organic pigment, a total content of the organic colorant is 5% by mass or more and 20% by mass or less with respect to a total mass of the toner particles, and a specific gravity D1 of the non-fluorescent organic pigment and a specific gravity D2 of the fluorescent organic pigment satisfy both of Formulas (1) and (2).D1≥2.0 Formula (1)D1−D2≥0.6 Formula (2).