Cyan Ink Dye Formulation for Ozone and Light Stability
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Solution Overview
Problem
Current cyan inks for ink-jet recording face challenges in achieving excellent hue, light fastness, ozone resistance, and ejection stability due to the limitations of copper phthalocyanine-based dyes, which often suffer from poor solubility and discoloration issues.
Innovation Solution
A cyan ink formulation combining a copper phthalocyanine-based dye with excellent ozone resistance but poor solubility with another dye having good solubility and color developing properties, maintaining the favorable characteristics of both dyes through a specific ratio and formulation of the dyes, including C. I. Direct Blue 86, to enhance storage stability and ejection stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If copper phthalocyanine-based dyes are used for cyan ink, then light fastness is improved, but ozone resistance deteriorates
Solution Approach 1:
The patent combines two different copper phthalocyanine-based dyes (first and second dyes) into a composite ink formulation. The first dye provides excellent light fastness, while the second dye contributes superior ozone resistance. This composite approach allows the ink to achieve both high light fastness and high ozone resistance simultaneously, resolving the technical contradiction between these two properties.
2Object-affected harmful factors
If copper phthalocyanine-based dyes with improved ozone resistance are used, then ozone resistance is improved, but solubility deteriorates
Solution Approach 1:
The patent formulates an ink containing two copper phthalocyanine-based dyes in specific proportions. The second dye, which has improved ozone resistance but poorer solubility, is combined with the first dye that maintains good solubility characteristics. This composite formulation ensures that the ink achieves high ozone resistance while maintaining adequate solubility and ejection stability through the synergistic effect of both dyes.
3Device complexity
If single dye formulations are used, then formulation simplicity is maintained, but overall performance deteriorates
Solution Approach 1:
The patent employs a composite ink formulation containing two copper phthalocyanine-based dyes with different functional strengths. This composite approach delivers superior overall performance with high light fastness, high ozone resistance, and good ejection stability, while maintaining relatively simple formulation and manufacturing processes. The synergistic combination of the two dyes achieves multi-property optimization without significant increase in formulation complexity.
Data Source
AI summary
A cyan ink for ink-jet recording contains a coloring agent, water and a water soluble organic solvent. Different types of dyes are employed as the coloring agent. In particular, a dye represented by the general formula (1) is used together with at least one dye selected from the group consisting of a dye represented by the general formula (2), a dye represented by the general formula (3) and C. I. Direct Blue 86. In the formulas, Pc(Cu) is a copper phthalocyanine nucleus.