Polyester Rheological Additive for Non-Aqueous Systems
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Solution Overview
Problem
Existing rheological additives for non-aqueous systems, such as paints and coatings, often require solvents to maintain a liquid state and are not fully rheologically active, limiting their efficiency and application in thickening various compositions.
Innovation Solution
A polyester composition synthesized from polyols and polycarboxylic acids with basic compounds, which imparts thixotropy to non-aqueous systems without the need for solvents, maintaining a liquid state and providing efficient thickening at low levels, utilizing specific stoichiometric ratios and reaction pathways to prevent cross-linking and achieve desired molecular weights.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing rheological additives are used in non-aqueous systems, then thickening effect is achieved, but solvent is required to maintain liquid state and rheological activity is incomplete
Solution Approach 1:
The invention changes the chemical structure of the rheological additive by using polyester molecules with specific molecular weights and carboxylic acid content. The polyester is designed to be inherently rheologically active without requiring solvent, achieving complete rheological activity while eliminating the need for additional solvent to maintain liquid state.
Solution Approach 2:
The polyester-based rheological additive is self-sufficient and does not require external solvent to maintain its liquid state or rheological activity. The molecule itself provides both the thickening function and the liquid state maintenance, eliminating the need for separate solvent components.
2Productivity
If existing rheological additives are used, then thickening is achieved, but efficiency is limited due to incomplete rheological activity
Solution Approach 1:
The invention optimizes the molecular parameters of the polyester, specifically controlling molecular weight between 1,000-30,000 Daltons and carboxylic acid content between 1-10 mmol/g. These parameter changes enable the additive to achieve nearly complete rheological activity and significantly improve thickening efficiency compared to conventional additives.
3Manufacturing precision
If polyester composition is synthesized with specific stoichiometric ratios, then desired molecular weight and rheological properties are achieved, but cross-linking may occur
Solution Approach 1:
The invention precisely controls the stoichiometric ratio of polyol to polycarboxylic acid during synthesis, maintaining a ratio between 1:1 and 1.5:1.5. This parameter control ensures the polyester achieves desired molecular weight and rheological properties while preventing excessive cross-linking that would compromise composition stability.
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 polyester composition offers nearly complete rheological activity, improved flow and leveling properties, and easy dispersion, allowing for effective thickening of a wide range of organic and solvent-based compositions with reduced solvent usage, maintaining stability at elevated temperatures and during aging.
Implementation Method 1
a rheological additive comprising: one or more polyesters including the reaction products of: one or more polyols having at least two hydroxyl moieties; and one or more polycarboxylic acids having at least two carboxylic acid moieties; and one or more basic compounds, wherein the polyesters have at least two active carboxylic acid moieties as end groups and at least a portion of the carboxylic acid moieties are in the carboxylate anion form; and one or more particulate materials, wherein the rheological additive imparts thixotropy to the system
Data Source
AI summary
A thixotropy imparting composition. The composition comprises the reaction products of: one or more polyesters from one or more polyols having at least two hydroxyl moieties; and one or more polycarboxylic acids having at least two carboxylic acid moieties; and one or more basic compounds, wherein said polyesters have at least two active carboxylic acid moieties as end groups and at least a portion of said carboxylic acid moieties are in the carboxylate anion form. This composition may further comprise one or more diluents. The composition exists as a liquid. The composition may be used in a non-aqueous fluid system as a rheological additive in combination with one or more particulate materials, wherein said rheological additive imparts thixotropy to said system.A thixotropy imparting composition. The composition comprises the reaction products of: one or more polyesters from one or more polyols having at least two hydroxyl moieties; and one or more polycarboxylic acids having at least two carboxylic acid moieties; wherein said polyesters have at least two active carboxylic acid moieties as end groups. This composition may further comprise one or more diluents. The composition may exist as a liquid. The composition may be used in a non-aqueous fluid system as a rheological additive in combination with one or more particulate materials, wherein said rheological additive imparts thixotropy to said system.