Azo Magenta Ink Composition for Red Saturation and Bleeding Control
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Solution Overview
Problem
Ink jet recording technologies face challenges with azo-based magenta pigments, including insufficient color development, bleeding, curling of the recording medium, and dispersion stability issues, particularly when using high red saturation inks, which can result in white spots and printing irregularities.
Innovation Solution
A water-based magenta ink jet ink composition incorporating an azo-based pigment with a volume average particle diameter of 110 nm or less and a 1,2-alkanediol with 4 to 8 carbon atoms, where the 1,2-alkanediol content is 3.5% or less by mass, enhancing permeability and dispersion stability while reducing ink adhesion and pigment precipitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If azo-based magenta pigment is used to improve red color saturation, then color development property is enhanced, but bleeding and curling of recording medium occur
Solution Approach 1:
The patent applies parameter changes by precisely controlling the particle size of azo-based pigment (D50: 110-250 nm) and the content of 1,2-alkanediol (3.5-20 mass%). By optimizing these parameters, the ink achieves improved red color saturation while suppressing bleeding and curling effects that occur with conventional pigment formulations.
Solution Approach 2:
The patent uses composite materials by combining azo-based pigment with specific 1,2-alkanediol compounds (having 4-8 carbon atoms) in controlled proportions. This composite ink composition works synergistically to enhance color development while preventing the harmful effects of bleeding and medium curling.
2Illumination intensity
If azo-based magenta pigment is used to improve red color saturation, then color development is enhanced, but dispersion stability deteriorates
Solution Approach 1:
The patent resolves this contradiction by changing the particle size parameter of the azo-based pigment to a specific range (D50: 110-250 nm) and optimizing the 1,2-alkanediol content (3.5-20 mass%). These parameter adjustments ensure that high red color saturation is achieved while maintaining excellent dispersion stability, preventing pigment aggregation and ink formulation instability.
3Illumination intensity
If ink composition is optimized for color saturation, then red saturation is improved, but white spots and printing irregularities occur
Solution Approach 1:
The patent eliminates white spots and printing irregularities by precisely controlling the particle size distribution (D50: 110-250 nm) and 1,2-alkanediol content (3.5-20 mass%). This ensures uniform ink ejection, consistent drying behavior, and homogeneous color deposition, achieving both high red saturation and excellent printing uniformity.
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 ink composition achieves improved red color saturation, reduced bleeding, and suppressed curling of the recording medium, maintaining image quality and reducing ink consumption, thereby enhancing color development and storage stability.
Implementation Method 1
enhancing permeability
Implementation Method 2
improved red color saturation
Data Source
AI summary
An ink jet ink composition functioning as a water-based magenta ink includes an azo-based pigment and a 1,2-alkanediol having 4 to 8 carbon atoms. In the ink jet ink composition described above, the azo-based pigment has a volume average particle diameter D50 of 110 nm or less, and a content of the 1,2-alkanediol having 4 to 8 carbon atoms with respect to a total mass of the composition is 3.5 percent by mass or less.