Ink Jet Ink Composition Stabilizing Disperse Dye Dispersion
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Solution Overview
Problem
Existing ink jet ink compositions face challenges in maintaining the dispersion of disperse dyes, particularly in pale color inks, due to the insolubility of disperse dyes in water and the precipitation of coloring materials as temperature changes, leading to the formation of foreign matter aggregates.
Innovation Solution
Incorporating a specific compound represented by formula (1) that reduces foreign matter by increasing the compatibility between disperse dyes and dispersants, thereby stabilizing the dispersion and preventing the formation of aggregates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If disperse dye is dispersed in aqueous liquid using dispersant and surfactant, then the dye can be suspended without settling, but foreign matter aggregates form due to precipitation when temperature changes or composition changes occur
Solution Approach 1:
The patent introduces a specific compound (formula 1) as an intermediary substance that mediates between the disperse dye and dispersant. This compound has both hydrophobic aryl groups that interact with the dye and hydrophilic groups (carboxy, hydroxy, or sulfo) that interact with the dispersant, creating a stable interface that prevents aggregation and foreign matter formation while maintaining suspension stability.
Solution Approach 2:
The patent creates a composite dispersion system combining disperse dye, dispersant, surfactant, and the specific compound (formula 1). This composite approach allows each component to perform its specialized function: the dye provides color, the dispersant prevents settling, the surfactant controls surface tension, and the compound (formula 1) stabilizes the interface, collectively preventing foreign matter formation while maintaining stable suspension.
2Stability of the object's composition
If dispersant is added in higher content than disperse dye to maintain dispersion, then dispersion stability improves, but excess dispersant dissolves the disperse dye and produces foreign matter
Solution Approach 1:
The patent optimizes the concentration parameters of all components, particularly establishing that the compound (formula 1) should be present at 0.01-10 parts by mass per 1 part by mass of disperse dye. This precise parameter control ensures sufficient dispersion stability while preventing the conditions that lead to foreign matter formation from excess dispersant or dissolved dye.
Solution Approach 2:
The compound (formula 1) acts as a mediator that reduces the direct interaction between excess dispersant and disperse dye. By providing alternative interaction sites through its dual hydrophobic-hydrophilic structure, it prevents the dispersant from dissolving the dye, thereby eliminating the source of foreign matter while maintaining adequate dispersion stability.
3Ease of operation
If disperse dye is pulverized into fine crystals and dispersed, then the dye can be suspended in medium, but the insoluble dye precipitates when solvent temperature is reduced
Solution Approach 1:
The compound (formula 1) serves as a temperature-buffering intermediary that maintains dye-dispersant interaction across temperature changes. Its molecular structure with both hydrophobic and hydrophilic regions allows it to remain effective at stabilizing the dispersion interface regardless of temperature fluctuations, preventing precipitation that would otherwise occur when solvent temperature is reduced.
Solution Approach 2:
The patent introduces a new compositional parameter - the compound (formula 1) at specific concentrations (0.01-10 parts per 1 part dye) - that fundamentally changes the temperature-stability characteristics of the dispersion. This compositional modification enables the system to maintain stability across a broader temperature range while preserving the fine crystal dispersion processability.
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 compound enhances the dispersibility of disperse dyes, reduces excess dispersant issues, and maintains the stability of the ink composition, minimizing foreign matter formation and improving the overall performance of the ink jet ink.
Implementation Method 1
a disperse dye and a compound represented by the following formula (1)... the compound enhances the dispersibility of disperse dyes, reduces excess dispersant issues, and maintains the stability of the ink composition
Implementation Method 2
it has been confirmed that the disperse dye can dissolve at a molecular level in the presence of a solvent, a dispersant, and a surfactant
Implementation Method 3
A dispersant or a surfactant is essential to keep a disperse dye suspended in a medium (solvent) without settling and thus to control the viscosity and the surface tension to be appropriate as an ink
Implementation Method 4
keep a disperse dye suspended in a medium (solvent) without settling
Implementation Method 5
Incorporating a specific compound represented by formula (1) that reduces foreign matter by increasing the compatibility between disperse dyes and dispersants, thereby stabilizing the dispersion and preventing the formation of aggregates
Data Source
AI summary
An ink jet ink composition contains a disperse dye, and a compound represented by the following formula (1):In the formula, Ar1 and Ar2 each independently represent an aryl group; R1 and R2 each independently represent a chemical species selected from the group consisting of hydrogen, alkyl groups having a carbon number of 1 to 3, a sulfo group, —O—SO3H, a carboxy group, and a hydroxy group; and n's each independently represent an integer of 0 to 5. The content of the compound represented by formula (1) is 0.1% by mass to 20% by mass relative to the total mass of the ink jet ink composition.