Amide-Containing Polymers for Clear Coating Rheology Control
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Solution Overview
Problem
Existing rheology control agents for liquid polymer systems, such as polyamides and polyamide esters, often result in clouding, haze formation, and handling issues due to their solid or paste form, and provide inconsistent performance due to undefined structures and uncontrolled reactions, leading to premature gelation and precipitation.
Innovation Solution
Development of amide-containing polymers with a defined structure, specifically those following the general formula (I) and their salts with carboxylic acids, phosphoric acid esters, and sulfonic acids, which offer improved reproducibility and effectiveness in rheology control by avoiding the limitations of prior agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dry solids or pastes (polyamides, polyamide esters) are used for rheology control, then rheology control effectiveness is improved, but handling difficulty increases and clouding/haze formation occurs
Solution Approach 1:
The invention changes the physical state parameter from solid/paste to liquid by incorporating the polyamide or polyamide ester into a liquid carrier system, maintaining the molecular structure responsible for rheology control while eliminating handling difficulties and clouding issues associated with solid forms
Solution Approach 2:
The invention uses a liquid carrier (such as a polymer solution or solvent system) as an intermediary medium to deliver the rheology-control-active polyamide molecules into the coating system, avoiding direct introduction of solid particles that cause dust and clouding
2Reliability
If modified bentonites with polyamides are used for rheology control, then rheology control effectiveness is improved, but manufacturing complexity increases
Solution Approach 1:
The invention extracts and uses only the essential rheology-control-active polyamide component, separating it from complex composite systems like modified bentonite-polyamide combinations, thereby simplifying the manufacturing process while maintaining effectiveness
3Reliability
If urea urethanes are produced in aprotic solvents with LiCl, then rheology control is achieved, but product stability decreases due to undefined structure
Solution Approach 1:
The invention changes the synthesis parameters by using different solvent systems and reaction conditions that promote formation of well-defined polyamide structures with controlled molecular weights and minimal side products, thereby achieving both rheology control and product stability
4Ease of operation
If polyamide esters are used in liquid form, then handling ease is improved, but rheology control effectiveness decreases
Solution Approach 1:
The invention creates a composite liquid system combining polyamide esters with additional rheology-control-active components or uses specially designed polyamide ester structures that maintain liquid state while preserving or enhancing thixotropic and rheology-modifying properties
Data Source
AI summary
The invention relates to amide-containing polymers of the general formula (I) AX-CO-(CH2)2-NR1-R2-[Y-R3-Y-R4]aB (I) and their salts with carboxylic acids, phosphoric acid esters and sulfonic acids. Furthermore, the invention relates to processes for the production of the amide-containing polymers and their use as rheology control agents.