Water-Based Ink Dye Formulation for Ozone and Light Resistance
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Solution Overview
Problem
Magenta inks for ink-jet recording, particularly those containing dyes like C. I. Acid Red 52 and C. I. Acid Red 289, lack sufficient ozone resistance and light resistance, which affects the durability and quality of printed images.
Innovation Solution
A water-based ink formulation comprising a specific dye (1) and dye (2), where dye (1) is represented by a general formula with sodium or ammonium salts and a monoalkylamino group, and dye (2) is selected from specific structures or C. I. Acid Red 1 and C. I. Acid Red 254, improving ejection stability, ozone resistance, and light resistance when combined in specific weight ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional magenta dyes (C. I. Acid Red 52, C. I. Acid Red 289) are used to achieve higher color developing properties, then color developing properties are improved, but ozone resistance and light resistance deteriorate
Solution Approach 1:
The patent uses a composite dye system combining two different dye structures (Formula 1 dye with triphenylmethane core and Formula 2 dye with azo group) to achieve both high color developing properties and improved environmental resistance. The synergistic combination allows the ink to exhibit superior color strength while simultaneously improving ozone and light resistance compared to single-dye formulations.
Solution Approach 2:
The patent optimizes the weight ratio parameters of the two dyes (Formula 1 dye: 5-20 wt%, Formula 2 dye: 80-75 wt%) to achieve the desired balance between color developing properties and environmental resistance. By carefully controlling these compositional parameters, the ink formulation achieves both high color strength and improved stability against ozone and light degradation.
2Reliability
If dyes with higher color strength are used, then color developing properties are improved, but image durability under environmental conditions deteriorates
Solution Approach 1:
The patent employs a composite dye formulation where Formula 1 dye (5-20 wt%) provides excellent color developing properties with high color strength, while Formula 2 dye (80-75 wt%) contributes superior environmental stability. This composite approach ensures that printed images maintain both vibrant color development and long-term durability against environmental degradation.
Solution Approach 2:
The patent assigns different functional roles to each dye component: Formula 1 dye is optimized for color development and strength, while Formula 2 dye is optimized for environmental resistance and stability. This division of functional qualities within the dye system allows the ink to simultaneously achieve high color strength and long-lasting image durability.
Data Source
AI summary
A water-based ink for ink-jet recording includes a coloring agent, water, and a water-soluble organic solvent. The coloring agent includes the following a dye (1) and a dye (2).dye (1): a dye represented by the general formula (1)dye (2): at least one dye selected from the group consisting of dyes represented by the general formula (2a), dyes represented by the general formula (2b), C. I. Acid Red 1, and C. I. Acid Red 254.