Inkjet Ink Composition for Stable Dispersion and Glossy Images
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Solution Overview
Problem
Existing inkjet inks struggle to achieve high glossiness and stability due to issues with pigment dispersion, drying properties, and dot size, leading to decreased smoothness and glossiness.
Innovation Solution
An inkjet ink formulation containing a pigment, a pigment dispersant with specific acid and amine values, a binder resin, water, and an organic solvent, where the water content is 3.0-10.0% by mass, and the pigment dispersant is soluble in both water and the organic solvent, ensuring stable pigment dispersion and optimal drying properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional inkjet ink formulations are used, then the ink can be jetted from the nozzle, but the image glossiness and smoothness are insufficient
Solution Approach 1:
The patent changes the chemical parameters of the pigment dispersant by specifying precise ranges for acid value (5-25 mgKOH/g) and amine value (10-30 mgKOH/g), along with controlling water content (3.0-10.0% by mass). These parameter adjustments optimize the balance between pigment dispersion stability and image glossiness, resolving the contradiction between reliability and illumination intensity.
Solution Approach 2:
The patent employs a composite dispersant system that combines water-soluble and organic solvent-soluble components with specific acid-base properties. This composite approach enables simultaneous improvement of pigment dispersion stability and image glossiness by leveraging the complementary characteristics of different material components.
2Stability of the object's composition
If the water content is increased to improve pigment dispersion, then the ink becomes more stable, but the drying properties and dot size are adversely affected
Solution Approach 1:
The patent optimizes the water content parameter to a specific range of 3.0-10.0% by mass, which provides sufficient pigment dispersion stability while preventing excessive water that would adversely affect drying properties and dot size. This precise parameter control resolves the contradiction between stability and manufacturing precision.
Solution Approach 2:
The patent introduces an organic solvent as an intermediary component that works synergistically with water to provide both pigment dispersion stability and appropriate drying properties. The organic solvent mediates between the conflicting requirements of high water content for stability versus low water content for good drying performance.
3Stability of the object's composition
If the pigment dispersant has high acid value to improve dispersion, then the pigment stability increases, but the solubility in organic solvent decreases
Solution Approach 1:
The patent specifies a balanced range for acid value (5-25 mgKOH/g) and amine value (10-30 mgKOH/g) for the pigment dispersant. This dual-parameter control ensures sufficient pigment stability while maintaining solubility in both water and organic solvents, resolving the contradiction between stability and adaptability.
Solution Approach 2:
The patent employs a composite dispersant formulation that combines components with different acid-base characteristics. This composite approach enables the dispersant to achieve both high pigment stability through acid-base interactions and broad solubility in both water and organic solvents, eliminating the trade-off between these properties.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The formulation enables the formation of images with excellent glossiness, smoothness, and stability, with improved dot size and drying properties, enhancing storage stability and adhesion to various substrates.
Implementation Method 1
the pigment dispersant is soluble in water and in the organic solvent S
Implementation Method 2
The solvent ink dries on a substrate mainly by evaporation of the organic solvent
Data Source
AI summary
Disclosed is an inkjet ink including: a pigment; a pigment dispersant; a binder resin; water; and an organic solvent S, in which the amount of the water is in a range from 3.0 to 10.0% by mass, relative to the total amount of the ink, the pigment dispersant has an acid value of 5 to 25 mgKOH/g and an amine value of 10 to 30 mgKOH/g, and the pigment dispersant is soluble in water and in the organic solvent S.