Ink Composition Dye Structure for Color Density and Light Resistance
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Solution Overview
Problem
Existing ink compositions used in inkjet recording methods often fail to achieve a balance between color developing density and light resistance, leading to reduced image quality and storage stability due to dye decomposition from light and atmospheric exposure.
Innovation Solution
An ink composition comprising specific compounds represented by general formulas (1) and (21) or their salts, which include a first dye and a second dye, providing excellent light resistance and gas resistance, and improving storage stability by maintaining color balance and density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a dye is added to improve color developing density, then the color quality deteriorates due to poor light resistance and gas resistance
Solution Approach 1:
The patent changes the chemical parameters of the dye by specifying precise structural formulas (general formulas 1 and 21) with defined substituents and molecular characteristics. This parameter change enables the dye to simultaneously achieve high color developing density and excellent light/gas resistance, resolving the contradiction between color quality and reliability.
Solution Approach 2:
The patent employs a composite dye system where the dye molecules incorporate multiple functional groups (azo groups, heterocyclic structures, specific substituents) within a single molecular framework. This composite structure allows the dye to exhibit both high color density and superior resistance to light and atmospheric gases, effectively resolving the technical contradiction.
2Reliability
If a dye with good light resistance is added to improve durability, then the color developing density deteriorates
Solution Approach 1:
The patent optimizes the molecular parameters of the dye by defining specific structural features in general formulas 1 and 21, including the arrangement ofazo groups, heterocyclic moieties, and substituents. These parameter adjustments enable the dye to achieve both high light/gas resistance and high color developing density, eliminating the trade-off between durability and color quality.
Solution Approach 2:
The patent utilizes a composite molecular structure where multiple functional components (azo chromophores, heterocyclic stabilizing groups, electron-donating/withdrawing substituents) are integrated into a single dye molecule. This composite design allows simultaneous achievement of excellent light resistance, gas resistance, and high color developing density.
3Manufacturing precision
If conventional dyes are used to achieve color balance, then storage stability deteriorates due to dye decomposition
Solution Approach 1:
The patent modifies the chemical parameters of the dye structure by specifying particular molecular architectures in general formulas 1 and 21, including stable heterocyclic rings and resilient azo linkages. These structural parameter changes enhance the dye's resistance to decomposition during storage while maintaining excellent color balance, thereby resolving the contradiction between color quality and storage stability.
Solution Approach 2:
The patent employs a composite dye structure incorporating stabilizing heterocyclic frameworks and robust azo bonds that protect the chromophoric centers from degradation. This composite molecular design ensures both superior color balance and enhanced storage stability by preventing dye decomposition over time.
Data Source
AI summary
An ink composition includes: water, a compound represented by the following general formula (1) or a salt thereof, and a compound represented by the following general formula (21) or a salt thereof. (in the formula (1), n represents 0 or 1, each of R1, R2, R3, and R4 represents a substituent, Group A represents a substituted heterocyclic group represented by the following general formula (2) or (3): in the formula (2), R5 represents a substituent. in the formula (3), each of R6, R7, and R8 represents a substituent, and Group B has a substituted phenyl group or naphthyl group). (in the formula (21), each of R21, R22, R23, R24, R25, R26, R27, and R28 represents a substituent, and X represents a divalent crosslinking group).