Aqueous Inkjet Ink Formulation for High-Gloss Media
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Solution Overview
Problem
Conventional aqueous inks for inkjet printing suffer from image bleeding on low water-absorbing media like coated paper and vinyl chloride sheets, limiting their printability and quality.
Innovation Solution
An aqueous inkjet ink composition containing a pigment, a pigment dispersing resin with an alkyl group of 10 or more carbon atoms, specific organic solvents with controlled boiling points and surface tensions, and a polysiloxane-type surfactant, which improves dispersion stability and prevents bleeding by adjusting the solvent ratio and adding surfactants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional aqueous ink is used for printing on low water absorbing media, then the ink can be applied to the media, but image bleeding occurs and print quality deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the aqueous ink by incorporating specific organic solvents (glycols and glycol ethers) with controlled ratios, adjusting the solvent system to reduce water's aggressive absorption into low water-absorbing media while maintaining ink流动性 and print quality
Solution Approach 2:
The patent creates a composite ink formulation combining water with multiple organic solvents (glycols and glycol ethers) in specific proportions, forming a multi-component solvent system that achieves both bleeding prevention and acceptable printability on challenging media
2Manufacturing precision
If the ink formulation is optimized for high glossiness media, then print quality improves, but printability on other media types deteriorates
Solution Approach 1:
The patent develops a universal ink formulation using a multi-component organic solvent system that can adapt to different media types (high gloss, low water-absorbing, and other substrates), achieving both high print quality and broad media compatibility through the synergistic combination of glycols and glycol ethers
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 ink composition achieves superior printability and high-quality images on high-gloss media by preventing pigment flocculation and ensuring uniform coating, reducing bleeding and enhancing glossiness.
Implementation Method 1
an organic solvent (B) having a boiling point of 200°C or higher and 280°C or lower and having a surface tension of 20 mN/m or more and 30 mN/m or less at 25°C
Implementation Method 2
the pigment dispersing resin has an alkyl group with a carbon atom number of 10 or more
Implementation Method 3
adding surfactants
Implementation Method 4
an organic solvent (B) having a boiling point of 200°C or higher and 280°C or lower
Data Source
AI summary
To provide an aqueous ink for inkjet which has superior printability to typical printing media, particularly media having high glossiness, such as coated paper, art paper, and vinyl chloride sheets, and which is capable of forming a high quality image by printing. An aqueous ink for inkjet, comprising a pigment, a pigment dispersing resin, an organic solvent, and water, wherein: the organic solvent contains (A) a water-soluble organic solvent having a boiling point of 100°C or higher and 180°C or lower, and (B) an organic solvent having a boiling point of 200°C or higher and 280°C or lower, and having a surface tension of 20 mN/m or more and 30 mN/m or less.