Aqueous Ink Composition for Abrasion Resistance and Gloss Stability
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Solution Overview
Problem
Existing inkjet technologies struggle to achieve abrasion resistance comparable to offset printing on coated papers and maintain the glossy feeling when images are loaded and rubbed against each other, as current dispersants cause uneven wax distribution leading to changes in surface glossiness.
Innovation Solution
An aqueous inkjet ink using a combination of a nonionic dispersant with a HLB value of 9.0 to 18.0 and an anionic dispersant, such as sulfonic acid, carboxylic acid, or phosphoric acid groups, to disperse wax particles, preventing sea-island structures and ensuring uniform distribution, thereby maintaining glossiness and enhancing abrasion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a water-soluble resin is added to improve abrasion resistance, then the image abrasion resistance increases, but the ink layer peels when rubbed with strong force on coated paper
Solution Approach 1:
The patent changes the chemical composition parameters of the ink by incorporating specific dispersants (nonionic with HLB 3-13 and anionic) that modify how wax particles interact with the coating layer, enabling the ink to penetrate and bond with the coating rather than sitting on top, thus preventing peeling while maintaining abrasion resistance
Solution Approach 2:
The patent creates a composite ink formulation combining water-soluble resin, wax particles, and specific dispersants that work synergistically - the dispersants control particle distribution while the resin provides binding, achieving both adhesion and abrasion resistance simultaneously
2Strength
If wax is added to improve sliding property and abrasion resistance, then the image abrasion resistance increases, but the glossy feeling changes when recorded matters are loaded and rubbed
Solution Approach 1:
The patent controls the particle size distribution of wax particles (D50: 0.5-5 μm, D90: 10 μm or less) and uses specific dispersants to achieve uniform distribution, preventing the formation of sea-island structures that cause gloss variation while maintaining the lubricating effect for abrasion resistance
Solution Approach 2:
The patent achieves homogeneous distribution of wax particles throughout the ink and on the recorded surface through the use of specific nonionic and anionic dispersants, eliminating uneven gloss appearance while maintaining consistent abrasion resistance across the entire printed area
3Strength
If conventional dispersants are used to disperse wax, then the wax distribution becomes uneven forming sea-island structures, but the glossy feeling changes and abrasion resistance is insufficient
Solution Approach 1:
The patent specifies precise parameter ranges for dispersants (nonionic with HLB 3-13, specific anionic dispersants) and wax particle size (D50: 0.5-5 μm, D90: 10 μm or less) to achieve optimal dispersion, transforming the uneven sea-island structure into a homogeneous distribution that provides both gloss stability and abrasion resistance
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 achieves high abrasion resistance and suppresses changes in glossy feeling by uniformly dispersing wax particles, ensuring stable image quality even under rubbing conditions.
Implementation Method 1
a nonionic dispersant for dispersing the wax and an anionic dispersant for dispersing the wax
Data Source
AI summary
Provided is an aqueous ink for ink jet capable of recording an image, which has abrasion resistance required in a commercial printing field and an industrial printing field and which is suppressed from being changed in glossy feeling when recorded matters are loaded and their recorded surfaces are rubbed against each other. The aqueous ink for ink jet includes a wax, (i) a nonionic dispersant for dispersing the wax and (ii) an anionic dispersant for dispersing the wax. The nonionic dispersant is a compound represented by the general formula (1) and has a HLB value of 9.0 or more to 18.0 or less. The anionic dispersant is a compound having at least one kind of anionic group selected from the group consisting of: a sulfonic acid group; a carboxylic acid group; and a phosphoric acid group.