Ink Set Dye Formulation for Image Fastness and Brightness
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Solution Overview
Problem
Conventional ink sets for ink-jet recording fail to achieve satisfactory hue, brightness, and fastness properties such as water resistance, moisture resistance, gas resistance, and light resistance for full-color images.
Innovation Solution
An ink set composed of a cyan ink composition and a magenta ink composition, where the cyan dye and magenta dye are represented by specific formulas, providing improved solubility, filterability, and storage stability, and when used in ink-jet recording, result in highly brilliant and dense photographic color images with enhanced fastness properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dyes are used in ink-jet recording, then the ink compositions can be formulated with water soluble dyes, but the recorded images exhibit poor fastness properties including gas resistance and light resistance
Solution Approach 1:
The patent applies parameter changes by developing new dye molecules with specific chemical structures (formulae 1-4) that have inherent resistance to oxidation and light degradation. The molecular parameters such as conjugated systems, aromatic rings, and functional groups are optimized to achieve both color brilliance and fastness properties simultaneously
Solution Approach 2:
The patent creates composite ink formulations combining multiple dyes with different chemical structures (formulae 1-4) that work synergistically. Each dye component contributes specific properties: some provide brilliance while others enhance gas resistance and light fastness, achieving overall superior performance through material composition
2Illumination intensity
If conventional dyes are used to achieve brilliant colors, then the recorded images have good hue and brightness, but the storage stability of the ink compositions deteriorates
Solution Approach 1:
The patent modifies molecular parameters of the dye structures in formulae 1-4 to balance color intensity with chemical stability. Specific structural features such as electron-donating groups and aromatic systems are optimized to maintain brilliant color while preventing degradation during storage, achieving both brightness and long-term stability
3Reliability
If conventional dyes are used for ink-jet recording, then the ink compositions can be formulated, but the recorded images show poor water resistance and moisture resistance
Solution Approach 1:
The patent changes the hydrophobic parameters of the dye molecules in formulae 1-4 by incorporating non-polar aromatic rings and hydrophobic functional groups. This structural modification enables the dyes to resist water and moisture penetration while maintaining solubility in the ink vehicle, achieving water resistance without sacrificing color quality
Data Source
AI summary
An ink set is provided which, when used in color ink-jet printing, can give a full-color printed image having a satisfactory hue and brightness and excellent in various fastness properties. More specifically, an ink set for ink-jet recording is provided that is an ink set of at least two colors which includes at least two ink compositions, i.e., a cyan ink composition and a magenta ink composition. The cyan ink composition contains a cyan dye which is a dye represented by the following formula (7) or a salt thereof. The magenta ink composition contains a magenta dye which is a dye represented by the following formula (6) or a salt thereof.