Ink Composition Dye Ratio for Color Density and Light Resistance
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Solution Overview
Problem
Current ink compositions for inkjet recording struggle to achieve superior hue and color density, particularly in maintaining high-quality images with excellent light resistance and ozone resistance over time.
Innovation Solution
An ink composition comprising specific dyes, such as dyes (Bk-1) and (Bw-1), with defined chemical structures and content ratios, along with optional dyes (Y-1) and (Y-2), and additives like triethylene glycol monobutyl ether, to enhance color performance and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional black aqueous ink composition is used, then light resistance and ozone resistance are improved, but hue and color density are insufficient
Solution Approach 1:
The invention changes the chemical parameters of the ink composition by introducing specific dye compounds with defined molecular structures (compounds of formula (1) and (2) with specific substituent patterns). The dye content is precisely controlled within 3.5-10 mass% to achieve both durability and color quality. This parameter optimization resolves the contradiction between light/ozone resistance and hue quality.
Solution Approach 2:
The invention uses a composite dye system combining multiple dye compounds with different chemical structures (azo dyes, anthraquinone dyes, and other complementary dyes) to achieve synergistic effects. This composite approach allows the ink to simultaneously exhibit excellent light resistance, ozone resistance, and superior hue quality that cannot be achieved with single dyes alone.
2Manufacturing precision
If higher dye content is used, then color density is improved, but storage stability and bronzing prevention deteriorate
Solution Approach 1:
The invention optimizes the dye content parameter to a specific range of 3.5-10 mass%, with preferred ranges of 4-8 mass% and more preferably 4.5-6.5 mass%. This precise parameter control ensures sufficient color density while preventing excessive dye concentration that would cause bronzing and reduce storage stability. The balanced composition achieves both color quality and compositional stability.
Data Source
AI summary
An ink composition includes, as dyes, a dye (Bk-1) represented by the formula (Bk-1); and a dye (Bw-1) represented by the formula (Bw-1), in which a content ratio A (dye (Bk-1):dye (Bw-1)) of the dye (Bk-1) and the dye (Bw-1) is 100:18 to 100:40.