Ink Set with Specific Dye Compounds for Dispersion Stability
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Solution Overview
Problem
Ink jet technology faces challenges in maintaining the dispersion of pigment inks when they come into contact with dye inks, due to ion interactions that affect the ejection performance of the recording head, and existing solutions like reducing ion concentration in dye inks compromise color strength.
Innovation Solution
An ink set comprising a pigment ink and a dye ink with specific compounds, such as those represented by formulas (y-1) to (y-4) or their salts, where the dye ink contains 60.0% to 90.0% of the compound(s) by mass, along with additional dyes like C.I. Direct Yellow 86 and 132, and organic solvents with a solubility parameter of 12.5 or less, to maintain dispersion stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the concentration of ions in the dye ink is reduced, then the dispersion of pigment ink is improved, but the color strength of the dye ink deteriorates
Solution Approach 1:
The patent changes the chemical structure parameters of the dye molecules by introducing specific substituents (carboxymethyl, hydroxymethyl, or formyl groups at the 4-position of the pyridine ring) to achieve both good dispersion stability and sufficient color strength without requiring extreme ion concentration reduction
Solution Approach 2:
The patent creates a composite dye system combining specific pyridine ring structures with aromatic rings (benzene, pyrimidine, triazine, or pyridine) to achieve synergistic effects that maintain both dispersion stability and color strength
2Quantity of substance
If the structure of the dye molecule is complicated to improve color strength, then the color strength is improved, but the ion concentration in the dye ink increases
Solution Approach 1:
The patent applies local quality by introducing specific functional groups (carboxymethyl, hydroxymethyl, or formyl) only at the 4-position of the pyridine ring rather than complicating the entire molecular structure, achieving color strength enhancement with controlled ionic properties
Solution Approach 2:
The patent optimizes the balance between molecular complexity and ionic concentration by carefully selecting the type and position of substituents on the pyridine ring, achieving sufficient color strength while maintaining dispersion stability
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 proposed ink set ensures that the pigment ink remains in good dispersion even when in contact with the dye ink, preventing nozzle clogging and maintaining color strength, as demonstrated by high ozone resistance, light fastness, and moisture resistance, while minimizing the potential for causing clogging.
Implementation Method 1
the dye ink may contain an organic solvent having an sp of 12.5 or less in an amount of 5.0% by mass or more
Data Source
AI summary
An ink set includes a pigment ink, containing a pigment, and a dye ink containing the compound represented by formula (y-1) below or a salt thereof.