Aqueous Black Ink Composition for High Density and Stability
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Solution Overview
Problem
Current inkjet printing technologies face challenges in producing a stable black ink with neutral hues, high density, and excellent resistance to moisture, ozone gas, and light, particularly in maintaining color fidelity and resistance across various environments.
Innovation Solution
An aqueous black ink composition containing a specific combination of coloring matters represented by a particular formula, which includes various substituents such as sulfo groups, carboxy groups, and hydroxy groups, enhancing the ink's stability and resistance properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pigment ink is used to improve color development properties and water resistance, then image density and fastness are improved, but storage stability and nozzle clogging resistance deteriorate
Solution Approach 1:
The patent changes the chemical parameters of the coloring matter by using specific compound structures (formula 1 with defined R1-R7 groups and n=0 or 1) to achieve both high image fastness and storage stability. The molecular structure design allows the ink to maintain stability in storage while providing excellent water and light resistance in the printed image.
Solution Approach 2:
The patent creates a composite ink formulation combining the specific coloring matter (formula 1) with carefully selected solvents and additives. This composite approach achieves synergistic effects where the coloring matter provides both durability and stability without the drawbacks of traditional pigment or dye inks.
2Stability of the object's composition
If dye ink is used to improve storage stability and nozzle clogging resistance, then storage stability is improved, but color development properties and light resistance deteriorate
Solution Approach 1:
The patent modifies the chemical parameters by designing a specific molecular structure (formula 1) that bridges the gap between dye and pigment properties. The compound features aromatic rings with specific substituents that provide both the solubility characteristics of dyes and the light resistance of pigments.
3Productivity
If printing speed is enhanced to improve productivity, then output speed is improved, but image quality and color fidelity may deteriorate
Solution Approach 1:
The patent optimizes the physical parameters of the ink including viscosity and surface tension to enable high-speed droplet ejection while maintaining image quality. The specific compound structure provides appropriate flow characteristics that allow rapid printing without compromising color fidelity or image sharpness.
Data Source
AI summary
An aqueous black ink composition that contains a colorant represented by formula (1) and one or more colorants (B-a) to (B-t). The ink composition is stable even when stored for a long period of time, has a low chroma and tint-free neutral black-to-gray color even when printing a deep color or light color, has a high printed image density, exhibits no change in hue when printed on different media, and produces a black recorded image having particularly excellent recorded image color development properties, light resistance, ozone gas resistance and moisture resistance.