Anionic Polyester Dispersant for Ink Wettability and Stability
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Solution Overview
Problem
Resin type dispersants in ink dispersion liquids have low initial wettability with coloring materials, leading to increased dispersion time and stress on the material, resulting in insufficient dispersion stability and storage stability of the ink.
Innovation Solution
A dispersant-containing liquid with anionic water-soluble polyester containing carboxylate and/or sulfonate, polyalkylene glycols, and water is used to improve wettability and reduce dispersion time, enhancing the stability and storage stability of the aqueous coloring material dispersion liquid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resin type dispersant is used in aqueous dispersion liquid, then affinity for coloring material and low odor are improved, but initial wettability with coloring material is insufficient
Solution Approach 1:
The patent uses a composite dispersant system combining water-soluble polyester (providing affinity and low odor) with carboxylic acid or sulfonic acid (providing wettability). This composite approach allows the dispersant to simultaneously achieve both high affinity for coloring materials and good initial wettability, resolving the contradiction between these two properties.
Solution Approach 2:
The patent modifies the chemical parameters of the dispersant by introducing carboxylic acid or sulfonic acid groups to the water-soluble polyester structure. This parameter change enhances the surface activity and wettability of the dispersant while maintaining its affinity for coloring materials, thereby resolving the contradiction.
2Reliability
If resin type dispersant is used, then affinity for coloring material is improved, but dispersion time increases
Solution Approach 1:
The composite dispersant system combines the high affinity of water-soluble polyester with the rapid wetting capability of carboxylic acid or sulfonic acid. This synergistic combination allows the dispersant to quickly wet the coloring material surface and initiate dispersion, reducing dispersion time while maintaining high affinity.
Solution Approach 2:
The carboxylic acid or sulfonic acid acts as an intermediary that bridges the water-soluble polyester and the coloring material. It facilitates rapid interaction and wetting between the dispersant and coloring material, thereby reducing dispersion time while preserving the affinity provided by the polyester.
3Reliability
If resin type dispersant is used, then affinity for coloring material is improved, but dispersion stability is insufficient
Solution Approach 1:
The patent employs a composite dispersant where water-soluble polyester provides sustained affinity and low odor, while carboxylic acid or sulfonic acid contributes to rapid wetting and dispersion stability. This composite structure ensures both high affinity and adequate dispersion stability simultaneously.
Solution Approach 2:
By modifying the dispersant parameters to include carboxylic acid or sulfonic acid groups, the patent enhances the surface activity and electrostatic interactions that stabilize the dispersion. This parameter change maintains high affinity while improving dispersion stability through enhanced surface coverage and repulsion effects.
4Reliability
If resin type dispersant is used, then affinity for coloring material is improved, but stress on coloring material during dispersion increases
Solution Approach 1:
The composite dispersant system distributes the interaction with coloring material across two components: water-soluble polyester provides gentle, sustained affinity binding, while carboxylic acid or sulfonic acid provides rapid wetting. This distribution reduces the stress concentration on any single dispersant molecule during the dispersion process.
Solution Approach 2:
The carboxylic acid or sulfonic acid serves as an intermediary that rapidly establishes surface coverage and reduces stress on the coloring material by providing immediate wetting action. This intermediary component protects the coloring material from excessive stress during the dispersion process while maintaining affinity.
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 solution improves the wettability and dispersion efficiency of organic coloring materials, reducing stress during dispersion and enhancing the dispersion and storage stability of the ink, while maintaining the affinity and adsorptivity of the dispersant, thus improving the overall performance of the ink jet composition.
Implementation Method 1
a dispersant for improving wettability and dispersibility of the coloring material
Implementation Method 2
improve wettability and reduce dispersion time
Implementation Method 3
an ink in which a coloring material is dispersed in a dispersion medium containing water
Implementation Method 4
dispersion medium containing water
Implementation Method 5
the stress on the organic coloring material during dispersion
Data Source
AI summary
A dispersant-containing liquid of the present disclosure contains anionic water-soluble polyester containing a carboxylate and/or a sulfonate, polyalkylene glycols, and water. When a content of the water-soluble polyester in the dispersant-containing liquid is defined as XPEs [mass %] and a content of the polyalkylene glycols in the dispersant-containing liquid is defined as XPAG [mass %], it is preferable that Expression (4) be satisfied.0.01≤XPAG/XPEs≤2.(4)