Ink Set Dye Combinations for Light Fastness and Ozone Resistance
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Solution Overview
Problem
Conventional ink-jet recording inks face issues with insufficient light fastness and active gas resistance, leading to color fading and stability problems, particularly with magenta and cyan dyes that either lack vividness or cause compatibility issues with recording apparatus components.
Innovation Solution
The use of specific combinations of dyes in the yellow, magenta, and cyan inks, such as C. I. Direct Yellow 132 and C. I. Direct Yellow 86 for yellow, and pyrazolylazopyridine-based and Acid Red dyes for magenta, along with copper phthalocyanine-based dyes, to achieve balanced color developing properties, light fastness, and ozone resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a magenta dye with vivid color and wide color mixing range is used, then color developing properties are improved, but light fastness and active gas resistance deteriorate
Solution Approach 1:
The patent employs a composite dye system consisting of multiple magenta dyes with different chemical structures (azo dyes, anthraquinone dyes, xanthene dyes) working together. This composite approach allows the ink to achieve both vivid color properties and improved light fastness, as each dye component contributes different strengths to the overall performance
2Reliability
If a magenta dye with excellent light fastness and active gas resistance is used, then toughness properties are improved, but color vividness and hue quality deteriorate
Solution Approach 1:
The patent uses a composite dye system where multiple magenta dyes with different chemical structures (azo dyes, anthraquinone dyes, xanthene dyes) work together. This composite approach allows the ink to achieve both vivid color properties and improved light fastness, as each dye component contributes different strengths to the overall performance
3Reliability
If a phthalocyanine-based cyan dye with superior light fastness is used, then light fastness is improved, but solubility and storage stability deteriorate
Solution Approach 1:
The patent modifies the chemical parameters of phthalocyanine-based cyan dyes by introducing specific substituent groups (such as sulfonate, carboxylate, or hydroxyl groups) that enhance water solubility while maintaining the core phthalocyanine structure's superior light fastness properties
Solution Approach 2:
The patent combines phthalocyanine-based cyan dyes with other cyan dye types (such as indigo carmine or reactive blue dyes) to create a composite coloring system that balances light fastness, solubility, and storage stability through synergistic interactions between different dye components
Data Source
AI summary
An ink set for ink-jet recording is formed from a yellow ink in which C. I. Direct Yellow 132 and C. I. Direct Yellow 86 are employed, a magenta ink in which a specific pyrazolylazopyridine-based (or pyrazolylazopyrazine-based) dye and another specific dye are employed, and a cyan ink in which two specific types of copper phthalocyanine-based dyes are employed.