Ink Set Dye Chemistry for Clogging Resistance
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Solution Overview
Problem
Ink jet technology faces challenges with ink sets that are prone to clogging due to highly hydrophilic dyes, which affect color reproduction and resistance to environmental stimuli like ozone and water, leading to image discoloration and fading.
Innovation Solution
An ink set comprising a first yellow ink containing a specific sulfonic acid group-bearing dye, a second magenta ink with certain sulfonic acid and carboxy group-bearing dyes, and a third cyan ink with specific aromatic ring structures, along with surfactants and organic solvents, to enhance color reproduction and prevent clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If yellow or yellowish dyes with high hydrophilicity are used to improve color reproduction and resistance to environmental stimuli, then color strength and resistance to ozone and water are improved, but the ink jet head is prone to clogging
Solution Approach 1:
The patent modifies the chemical structure of yellow dyes by introducing specific substituents (e.g., at positions 2, 4, or 6 of the pyridine ring) to change their hydrophilicity parameters. This allows the dyes to maintain environmental resistance while reducing excessive hydrophilicity that causes clogging. The patent also adjusts the water content in the ink formulation to optimize both color performance and nozzle flow characteristics.
2Reliability
If yellow or yellowish dyes are used to achieve superior color reproduction, then color strength is improved, but the solubility in ink becomes more sensitive to water content changes causing clogging
Solution Approach 1:
The patent systematically modifies the chemical parameters of yellow dyes by introducing specific substituents at defined positions on the pyridine ring structure. This changes the dye's solubility characteristics and water content sensitivity. The patent also optimizes the ink formulation's water content and uses surfactants to maintain stable solubility across varying water concentrations, preventing clogging while preserving color reproduction quality.
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 set achieves improved color strength (gamut volume) and reduced clogging, maintaining image quality and resistance to environmental factors.
Implementation Method 1
a first yellow ink containing a specific sulfonic acid group-bearing dye
Implementation Method 2
along with surfactants and organic solvents, to enhance color reproduction and prevent clogging
Implementation Method 3
along with surfactants and organic solvents, to enhance color reproduction and prevent clogging
Data Source
AI summary
An ink set includes a first ink containing the compound represented by formula (y-1) or its salt, a second ink containing one or two or more of the compound represented by formula (m-1) or its salt, the compound represented by formula (m-2) or its salt, a compound represented by formula (m-3) or its salt, and the compound represented by formula (m-4) or its salt, and a third ink containing one or two or more of a compound represented by formula (c-1) or its salt, the compound represented by formula (c-2) or its salt, the compound represented by formula (c-3) or its salt, a compound represented by formula (c-4) or its salt, and the compound represented by formula (c-5) or its salt.