Quinacridone Solid Solution Pigment for Yellowish Hue and Stability
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Solution Overview
Problem
Quinacridone pigments used in ink-jet inks face challenges in achieving a yellowish hue and maintaining storage stability, with existing solid solutions either resulting in excessively large primary particles or poor hue uniformity and stability.
Innovation Solution
A quinacridone solid solution pigment comprising C. I. Pigment Violet 19 and C. I. Pigment Red 122, with a specific diffraction peak intensity ratio and crystallite thickness, is developed to achieve a yellowish hue and excellent storage stability, potentially incorporating a quinacridone pigment derivative for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a solid solution of C. I. Pigment Violet 19 and C. I. Pigment Red 202 is used to achieve yellowish hue, then the hue requirement is met, but the primary particles excessively grow leading to poor storage stability
Solution Approach 1:
The invention changes the chemical composition parameter by replacing C. I. Pigment Red 202 with C. I. Pigment Red 122 in the solid solution system. This parameter change achieves the desired yellowish hue while preventing excessive primary particle growth, thereby maintaining storage stability. The specific substitution modifies the crystal lattice parameters and particle formation behavior during ink drying.
Solution Approach 2:
The invention creates a composite pigment system using a solid solution of C. I. Pigment Violet 19 and C. I. Pigment Red 122. This composite material combines the yellowish hue properties of the red pigment with the stability characteristics of the violet pigment, achieving both color requirements and storage stability without excessive particle growth.
2Length of moving object
If a solid solution of C. I. Pigment Violet 19 and C. I. Pigment Red 122 is used to obtain fine primary particles, then smaller particles are achieved, but the hue becomes bluish and storage stability deteriorates
Solution Approach 1:
The invention optimizes the composition ratio parameter within the solid solution system of C. I. Pigment Violet 19 and C. I. Pigment Red 122. By controlling the proportion of each pigment component, the invention achieves fine primary particles while preventing the hue from becoming too bluish, thereby balancing particle size reduction with hue maintenance and storage stability.
3Illumination intensity
If existing quinacridone solid solutions are used, then some color properties are achieved, but the relationship between composition and property values (hue, storage stability) is not clear and cannot be specified
Solution Approach 1:
The invention establishes a feedback relationship between composition and properties by systematically determining the correlation between solid solution composition ratios and resulting hue/storage stability characteristics. This feedback mechanism enables prediction and control of pigment properties based on composition, allowing specification of optimal ratios for desired 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 solution provides a quinacridone pigment with a yellowish and clear hue and superior storage stability in ink-jet inks, ensuring uniform particle size and shape, and improved dispersion stability.
Implementation Method 1
A quinacridone solid solution pigment comprising C. I. Pigment Violet 19 and C. I. Pigment Red 122... a phase in which the atoms at the lattice points of a crystal phase are totally irregularly replaced by atoms of a different type, or a phase in which atoms of a different type are introduced into a crystal phase so as to be statistically distributed in the space of lattice
Implementation Method 2
the ratio of a diffraction peak intensity at a diffraction angle 2θ of 14.8±0.2° to a diffraction peak intensity at a diffraction angle 2θ of 11.9±0.2° is 1.20 or less, as measured by X-ray diffractometry
Implementation Method 3
The presence of a solid solution can be found by, for example, the measurement, of a crystal X-ray diffraction spectrum from a result that a new peak appears at a diffraction angle at which no peak is present
Data Source
AI summary
An object to be achieved by the present, invention is to provide a quinacridone pigment having hue that is yellowish and clear and having excellent storage stability, wherein the quinacridone pigment can be advantageously used in an ink-jet ink and the like. Provided is a quinacridone solid solution pigment comprising at least C. I. Pigment Violet 19 and C. I. Pigment Red 122, wherein the ratio of a diffraction peak intensity at a diffraction angle 2θ of 14.8±0.2° to a diffraction peak intensity at a diffraction angle 2θ of 11.9±0.2° is 1.20 or less, as measured by X-ray diffractometry with respect to the quinacridone solid solution pigment.