Water-Based Ink Bronzing Suppression via Alcoholamine and Sulfate Surfactant
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Water-based inks for inkjet recording often suffer from the bronzing phenomenon, which degrades image quality by causing a metal-like gloss that varies with observation angle, and existing solutions like urea derivatives or polycyclic aromatic hetero conjugated compounds either fail to sufficiently suppress this effect or risk altering the color of the recorded image.
Innovation Solution
A water-based ink formulation containing a specific dye represented by general formula (1), alcoholamine, and an anionic surfactant with a sulfate structure, which effectively suppresses the bronzing phenomenon without affecting the image color by inhibiting dye association, maintaining fluidity and discharge stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If urea derivative is blended to suppress bronzing phenomenon, then bronzing suppression is improved, but suppression effect is insufficient
Solution Approach 1:
The patent changes the chemical parameter by replacing urea derivative with a specific amine compound having a nitrogen-containing six-membered aromatic ring (such as pyridine or pyrimidine rings). This structural parameter change of the additive molecule enables sufficient bronzing suppression effect that urea derivative cannot achieve, while maintaining color accuracy.
Solution Approach 2:
The patent uses a composite approach by combining the nitrogen-containing aromatic ring compound with specific surfactants and dyes having particular molecular structures. This composite formulation achieves synergistic effect where the amine compound suppresses bronzing while the surfactant-dye combination maintains color fidelity, solving the insufficiency of single-component approaches.
2Object-affected harmful factors
If polycyclic aromatic hetero conjugated compound is blended to suppress bronzing phenomenon, then bronzing suppression is improved, but absorption wavelength of dye changes affecting color
Solution Approach 1:
The patent extracts and eliminates the problematic polycyclic aromatic hetero conjugated compound from the ink formulation. Instead, it introduces a nitrogen-containing six-membered aromatic ring compound (mono-cyclic or fused rings like pyridine, pyrimidine) that suppresses bronzing without the harmful conjugated system that alters dye absorption wavelength and color accuracy.
Solution Approach 2:
The patent replaces the complex polycyclic aromatic hetero conjugated compound with simpler nitrogen-containing aromatic ring compounds that achieve the same bronzing suppression function without side effects. These alternative compounds maintain ink performance while avoiding color distortion, effectively substituting a problematic substance with a superior alternative.
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 ink significantly reduces bronzing occurrences while maintaining image color integrity and ensuring excellent after-evaporation fluidity and discharge stability, avoiding the use of polycyclic aromatic hetero conjugated compounds that could alter the recorded image.
Implementation Method 1
an anionic surfactant having a sulfate structure which is contained at 0.02% by weight to 0.2% by weight in the water-based ink for ink jet recording
Implementation Method 2
an anionic surfactant having a sulfate structure
Data Source
AI summary
A water-based ink for ink jet recording includes water; a water-soluble organic solvent; alcoholamine which is contained at 0.2% by weight to 0.75% by weight in the water-based ink for ink-jet recording; an anionic surfactant having a sulfate structure which is contained at 0.02% by weight to 0.2% by weight in the water-based ink for ink jet recording; and a colorant including a dye represented by general formula (1).