Water-Based Ink Composition for Enhanced Light and Ozone Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional yellow inks for ink-jet recording fail to simultaneously achieve good clearness, color development, storage stability, light resistance, and ozone resistance.
Innovation Solution
A water-based ink composition comprising a specific dye (1) and dye (2), such as C. I. Direct Yellow 86, C. I. Direct Yellow 132, C. I. Direct Yellow 142, or C. I. Direct Yellow 173, with a weight ratio between 6:4 to 9:1, along with a water-soluble organic solvent like glycerin, to enhance preservation stability and light resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional yellow dyes (C.I. Direct Yellow 86, 132, 142, or 173) are used for ink-jet recording, then color development is improved, but preservation stability and light resistance deteriorate
Solution Approach 1:
The patent uses a composite dye system combining two different yellow dyes (C.I. Direct Yellow 86, 132, 142, or 173 with another yellow dye) in specific weight ratios (9:1 to 4:6). This composite approach allows the ink to achieve both good color development and improved preservation stability, as each dye contributes different properties that complement each other.
Solution Approach 2:
The patent optimizes the weight ratio parameter of the composite dye system and controls the total dye concentration (0.1-7 wt%) to achieve the desired balance between color development and preservation stability. By adjusting these parameters, the ink formulation achieves simultaneous improvement in both performance aspects.
2Illumination intensity
If conventional yellow dyes are used for ink-jet recording, then color development is improved, but light resistance deteriorates
Solution Approach 1:
The composite dye system combines two yellow dyes with different light resistance characteristics. The specific combination (C.I. Direct Yellow 86, 132, 142, or 173 with another yellow dye in 9:1 to 4:6 weight ratio) creates synergistic effects that improve overall light resistance while maintaining good color development.
Solution Approach 2:
The patent introduces a water-soluble organic solvent as an intermediary substance that mediates between the dye molecules and the recording material. This solvent system (containing polyalcohol and/or carboxylic acid) helps protect the dye from light degradation while maintaining color development properties.
3Manufacturing precision
If conventional yellow dyes are used for ink-jet recording, then clearness is improved, but ozone resistance deteriorates
Solution Approach 1:
The composite dye system provides both clearness and ozone resistance through the synergistic combination of two yellow dyes. The specific dye combination and weight ratio optimization ensure that the ink maintains good clearness while achieving improved ozone resistance that exceeds the average performance of individual dyes.
Solution Approach 2:
The water-soluble organic solvent acts as a protective intermediary between the dye and ozone. The solvent system (with polyalcohol and/or carboxylic acid) forms a protective environment that reduces ozone attack on the dye molecules while maintaining the clearness of the recorded image.
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 dye (1) and dye (2). The water-based ink is good in clearness, color development, and preservation stability as well as good in toughness of a recording material recorded using the water-based ink.Dye (1): dye represented by the following general formula (1)Dye (2): at least one dye selected from the group consisting of C. I. Direct Yellow 86, C. I. Direct Yellow 132, C. I. Direct Yellow 142, and C. I. Direct Yellow 173.