C.I. Pigment Yellow 74 Crystallinity Control for Inkjet Stability
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Solution Overview
Problem
Conventional C.I. Pigment Yellow 74 used in inkjet inks lacks sufficient weather resistance, particle size stability, and storage stability, which affects the clarity and transparency of outdoor prints.
Innovation Solution
The development of C.I. Pigment Yellow 74 with specific crystallinity and particle size characteristics, including a diffraction intensity ratio of 0.85 to 1.12 and an average primary particle size of 20 to 130 nm, enhances dispersibility and stability when used as a colorant in inkjet recording compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional C.I. Pigment Yellow 74 is used in inkjet inks, then production cost and production easiness are reduced, but weather resistance is insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the average primary particle size (20-130 nm) and crystallinity (diffraction intensity ratio 0.85-1.12) of C.I. Pigment Yellow 74. These parameter optimizations enable the pigment to achieve both ease of manufacture through standard processes and improved weather resistance suitable for outdoor inkjet printing applications.
2Stability of the object's composition
If C.I. Pigment Yellow 74 with optimized particle size is used, then dispersibility is improved, but particle size stability and storage stability need further enhancement
Solution Approach 1:
The patent optimizes both particle size (20-130 nm) and crystallinity parameters simultaneously. This dual parameter control ensures that the pigment maintains stable particle size during storage and application while achieving good dispersibility in inkjet formulations, resolving the contradiction between particle size stability and storage stability.
3Reliability
If conventional pigments are used for outdoor printing, then weather resistance is improved, but image clarity and transparency are compromised
Solution Approach 1:
The patent achieves a balance between weather resistance and image quality by optimizing the pigment's average primary particle size to 20-130 nm and controlling crystallinity (diffraction intensity ratio 0.85-1.12). These parameter changes enable the pigment to provide both outdoor durability and high image clarity with transparency, overcoming the limitations of conventional pigments.
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 optimized C.I. Pigment Yellow 74 provides improved weather resistance, particle size stability, and storage stability, enabling the formation of high-clarity and transparent images that were previously unachievable with conventional technologies.
Implementation Method 1
the ratio (26.6°/11.7°) of a diffraction intensity of a peak at 26.6° to a diffraction intensity of a peak at 11.7° in terms of Bragg angle (2θ±0.2°) in a range of 0.85 to 1.12 as measured by powder X-ray diffraction using CuKα-radiation
Data Source
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AI summary
A C.I. Pigment Yellow 74 as an insoluble azo pigment is provided. This C.I. Pigment Yellow 74 is crystalline particles. The ratio (26.6°/11.7°) of a diffraction intensity of a peak at 26.6° to a diffraction intensity of a peak at 11.7° in terms of Bragg angle (2θ±0.2°) as measured by powder X-ray diffraction using CuK α-radiation is 0.85 to 1.12, and the average primary particle size is 20 to 130 nm. The use of this C.I. Pigment Yellow 74 as a colorant in a coloring composition enables to provide the coloring composition with excellent dispersibility and good particle size stability and storage stability compared with conventional pigments. The use of this coloring composition enables the formation (recording) of images having excellent clarity and transparency of such high levels that have not been achievable by conventional technologies.