Benzylic Polyacrylate Composition to Minimize Coating Discoloration
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Solution Overview
Problem
Existing low molecular weight acrylic polymers used as dispersants and levelling agents in coatings exhibit undesirable yellowish discoloration, and previous solutions to mitigate this issue, such as changing process conditions or adding stabilizers, lead to increased costs and unwanted side effects.
Innovation Solution
Polyacrylate homopolymers and copolymers derived from benzyl alcohol, covalently bonded to the polyacrylate backbone, are used as levelling agents, minimizing discoloration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If low molecular weight acrylic polymers are produced by free radical solution polymerization in high boiling point aromatic solvents, then production cost is reduced, but discoloration (yellowish tint) occurs
Solution Approach 1:
The patent removes the harmful aromatic solvent from the polymerization system and replaces it with water as the continuous phase and surfactant as the dispersing agent, thereby extracting the source of discoloration while maintaining the economic benefits of the process
Solution Approach 2:
The patent changes the physical state of the polymerization system from homogeneous solution polymerization to emulsion polymerization, transforming the continuous phase from aromatic solvent to water, which fundamentally alters the reaction environment to prevent discoloration
2Object-generated harmful factors
If stabilizers are added to prevent discoloration, then discoloration is reduced, but costs increase and unwanted side effects occur
Solution Approach 1:
The patent eliminates the need for stabilizers by removing the root cause of discoloration (aromatic solvents) from the system, thereby extracting both the harmful factor and the costly additive simultaneously
Solution Approach 2:
The patent employs a surfactant that serves dual functions: as a dispersing agent for the polymer particles and as a protective colloid that prevents discoloration inherently, making the system self-protecting without additional stabilizers
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 polyacrylate polymers effectively reduce discoloration while maintaining their dispersant and levelling properties, offering a cost-effective solution without the drawbacks of previous methods.
Implementation Method 1
at least one moiety derived from the compound of the general formula (I) is covalently bonded to at least one of the ends of the polyacrylate backbone
Data Source
AI summary
The present invention relates to a polymer comprising a polyacrylate homo- or co-polymer backbone incorporating at least one benzylic derivative which is covalently bonded to at least one end of the homo- or co-polymer backbone and its use as a flow and levelling agent, additive, dispersant etc.