Polyurethane Dispersant with Solvent-Solubilizing Side Chains
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Solution Overview
Problem
Existing polyurethane dispersants for non-aqueous systems lack effective solubilizing properties and stability for particulate solids in organic media, particularly in non-contact printing processes like Drop-on-demand printing, due to limitations in solvent solubilizing side chains and cross-linking issues.
Innovation Solution
A non-aqueous composition comprising a particulate solid, an organic medium, and a polyurethane dispersant with an essentially linear backbone and laterally attached solvent-solubilizing polyester or polyether side chains, including pendant tertiary amine groups, which are optimized for the polarity of the medium to enhance dispersion stability and solubility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polyurethane dispersants with polyalkylene oxide side-chains are used, then foam stabilization and emulsion control are achieved, but effective solubilizing properties for particulate solids in non-aqueous organic media are insufficient
Solution Approach 1:
The patent applies local quality by attaching specific solvent-solubilizing side chains (polyester, polyacrylic, polyether, or polyolefin) to the polyurethane backbone at strategic locations. These side chains are selected based on their compatibility with the specific organic medium, creating localized regions of enhanced solubility and dispersion stability without compromising the overall dispersant structure.
Solution Approach 2:
The patent creates composite dispersant molecules combining polyurethane backbone with multiple types of solvent-solubilizing side chains. This composite structure integrates the foam stabilization capability of polyurethane with the solubilizing properties of various polymer side chains, achieving both dispersion stability and adaptability to different organic media.
2Reliability
If polyurethane dispersants with solvent-solubilizing side chains are used, then dispersion stability improves, but cross-linking issues arise during preparation
Solution Approach 1:
The patent incorporates cross-linking inhibitors during the preparation stage to prevent premature cross-linking reactions. This preliminary action allows the dispersant to be synthesized and stabilized before cross-linking occurs, enabling controlled formation of the dispersant structure while preventing unwanted cross-linking side reactions that would compromise manufacturing ease.
3Reliability
If existing dispersant structures are used, then basic dispersion stabilization is achieved, but viscosity profiles and coating properties (transparency, color strength) are insufficient
Solution Approach 1:
The patent optimizes the molecular weight, composition, and architecture of the solvent-solubilizing side chains to control the viscosity profile of the dispersion. By adjusting parameters such as the length and composition of polyester, polyacrylic, polyether, or polyolefin side chains, the dispersant achieves optimal balance between dispersion stabilization and controlled viscosity, improving coating properties like transparency and color strength.
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 described composition significantly improves the dispersion stability and solubility of particulate solids in organic media, leading to improved viscosity profiles and coating properties, such as increased transparency and color strength in paint and ink applications.
Implementation Method 1
laterally attached solvent-solubilizing side chains of polyester or polyether
Implementation Method 2
essentially linear backbone with laterally attached solvent-solubilizing side chains
Data Source
Figure 1
AI summary
The present invention provides a non-aqueous composition containing a particulate solid, an organic medium and a polyurethane dispersant having laterally attached pendant groups with tertiary amine group(s), an essentially linear backbone and laterally attached solvent-solubilising side chains of a polyester or polyether including mixtures of such side chains.