Polyester Dispersant with Carboxy and Sulfo Groups for Inkjet Stability
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Solution Overview
Problem
Existing dispersants struggle to simultaneously achieve high dispersion stability and drying resistance in water-based dispersions, particularly in inkjet applications, due to inadequate water solubility and solvation properties.
Innovation Solution
A dispersant-containing liquid comprising a polyester with carboxy and sulfo groups, along with a polyol solvent having a log P of −2.0 to 0.0, which enhances water solubility and solvation, thereby improving dispersion stability and drying resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a conventional dispersant is used to improve dispersion stability, then the dispersoid remains stable in the dispersion medium, but the drying resistance of the dispersion deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the dispersant by introducing both carboxy groups (which form no ester bond) and sulfo groups into the polyester molecule. This dual functional group configuration allows the dispersant to simultaneously provide dispersion stability through hydrophilic interaction and drying resistance through controlled water solubility and hydrogen bonding capabilities.
Solution Approach 2:
The patent creates a composite dispersant system combining polyester backbone with multiple functional groups (carboxy and sulfo groups) and integrates this with a specific polyol solvent system. This composite approach enables simultaneous achievement of dispersion stability and drying resistance that cannot be obtained with single-functional dispersants.
2Stability of the object's composition
If a dispersant with high water solubility is used to ensure dispersion stability, then the dispersoid remains well-dispersed, but the drying resistance deteriorates due to excessive water retention
Solution Approach 1:
The patent precisely controls the water solubility parameter of the dispersant by using a polyester with specific functional groups (carboxy groups that form no ester bond and sulfo groups) and combining it with a polyol having a log P of −2.0 to 0.0. This parameter optimization allows the dispersant to provide sufficient water solubility for stability while limiting excessive water retention that would harm drying performance.
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 effectively stabilizes dispersions and enhances drying resistance, allowing for efficient preparation and long-term stability of inkjet compositions by ensuring excellent water solubility and solvation properties of the polyester dispersant.
Implementation Method 1
a polyester having a carboxy group which forms no ester bond and a sulfo group
Implementation Method 2
the solvent includes a polyol having a log P of −2.0 to 0.0
Data Source
AI summary
A dispersion of the present disclosure includes a polyester functioning as a dispersant, water, a dispersoid, and a solvent, the polyester has a carboxy group which forms no ester bond and a sulfo group, and the solvent includes a polyol having a log P of −2.0 to 0.0. In the polyester, a rate of a content of a monomer having the carboxy group to a content of a monomer having the sulfo group is preferably 50% to 200% on a molar basis.