Aqueous Ink Jet Composition Dispersion Stability
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Solution Overview
Problem
Ink jet compositions containing disperse dyes, such as C.I. Disperse Red 364, face issues with long-term storage stability and clogging of head filters and nozzles due to inferior dispersion stability, leading to the generation of foreign materials during storage and ejection.
Innovation Solution
An aqueous ink jet composition comprising C.I. Disperse Red 364, a material A (including compounds like ethylene oxide adducts of tristyrylphenol and polyalkylene glycols), and an anionic dispersant, specifically a sodium salt of naphthalenesulfonic acid formalin condensate, to improve dispersion and storage stability, preventing foreign material generation and nozzle clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If C.I. Disperse Red 364 is used as a disperse dye in ink jet composition, then red-base coloring property is improved, but storage stability deteriorates and foreign materials are generated during long-term storage
Solution Approach 1:
A specific surfactant compound (formula 1 or 2) acts as an intermediary between C.I. Disperse Red 364 and the aqueous medium, preventing dye aggregation and foreign material generation at the gas-liquid interface during storage, thereby maintaining both coloring property and storage stability
Solution Approach 2:
The patent changes the chemical parameters by introducing specific surfactant compounds with defined molecular structures (formulas 1 and 2) and controlling their concentration ratios relative to the dye, which fundamentally alters the interfacial properties and prevents foreign material generation
2Illumination intensity
If C.I. Disperse Red 364 is used in ink jet composition, then coloring property is improved, but ejection stability deteriorates due to nozzle clogging
Solution Approach 1:
The surfactant compound serves as a mediator that reduces surface tension and prevents dye precipitation at the nozzle and head filter, ensuring stable ejection while maintaining the excellent coloring property of C.I. Disperse Red 364
Solution Approach 2:
By controlling the concentration ratio of the surfactant to the dye within specific ranges (0.01≤XA/XD≤1.5 and 0.2≤XB/XD≤2.0), the patent optimizes ejection stability while preserving coloring performance
3Stability of the object's composition
If conventional dispersants are used with C.I. Disperse Red 364, then dispersion is improved, but foreign material generation at gas-liquid interface increases
Solution Approach 1:
The patent introduces a specifically designed surfactant compound as an intermediary that selectively prevents foreign material generation at the gas-liquid interface while maintaining dispersion stability, addressing the limitation of conventional dispersants
Solution Approach 2:
The patent creates a composite system combining C.I. Disperse Red 364 with specific surfactant compounds (formulas 1 or 2) and anionic dispersants, where the synergistic interaction prevents foreign material generation 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 composition ensures stable ink ejection over time, enhances the quality of recorded matter, and prevents adverse effects on sublimation dyeing by maintaining the dispersion stability of C.I. Disperse Red 364, thereby improving storage and ejection stability.
Implementation Method 1
foreign materials are liable to be generated at a gas-liquid interface
Implementation Method 2
foreign materials are liable to be generated at a gas-liquid interface, and as a result, clogging of a head filter and/or a nozzle in ink ejection
Data Source
AI summary
An aqueous ink jet composition contains: C.I. Disperse Red 364; a material A which is at least one compound selected from the group consisting of a compound represented by the following formula (1), a compound represented by the following formula (2), an ethylene oxide adduct of tristyrylphenol, a derivative of the ethylene oxide adduct of tristyrylphenol, a polyalkylene glycol, and a derivative of the polyalkylene glycol; and an anionic dispersant.