Polymer Dispersion Viscosity Stability in High PVC Paints
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Solution Overview
Problem
Existing high pigment volume concentration (PVC) paints with phosphorus-containing monomers face a trade-off between improved scrub resistance, stain resistance, corrosion resistance, and durability, and paint viscosity stability, where increased phosphorus content compromises viscosity stability.
Innovation Solution
A polymer dispersion comprising 85% to 99.9% ethylenically unsaturated nonionic monomers, 0.01% to 4% phosphorous-containing (meth)acrylate monomers, and neutralizers with a final pH above 6, where 50% to 100% of the neutralizers are alcohol amines, is used to create a paint with balanced viscosity stability and enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phosphorus-containing monomers are increased to improve scrub resistance, stain resistance, corrosion resistance and durability, then paint performance is improved, but paint viscosity stability deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the polymer dispersion by incorporating phosphorus-containing (meth)acrylate monomers at controlled levels (0.01-4% by weight) within a specific monomer composition framework. This parameter adjustment improves paint performance (scrub resistance, stain resistance, corrosion resistance, durability) while the controlled concentration and specific monomer selection maintain paint viscosity stability, resolving the contradiction between enhanced performance and viscosity stability.
Solution Approach 2:
The patent creates a composite polymer dispersion system combining multiple monomer types: ethylenically unsaturated nonionic monomers (85-99.9%), phosphorus-containing (meth)acrylate monomers (0.01-4%), and optionally carboxylic acid monomers (0.1-5%). This composite material approach allows the phosphorus-containing components to provide enhanced paint performance while the dominant nonionic monomer matrix and balanced composition maintain viscosity stability, thus resolving the technical contradiction.
2Strength
If phosphorus-containing monomer content is increased, then scrub resistance and durability are improved, but paint viscosity stability decreases
Solution Approach 1:
The patent optimizes the concentration parameter of phosphorus-containing monomers to a specific range (0.01-4% by weight of total polymer particles) where sufficient scrub resistance and durability are achieved while viscosity stability is maintained. This precise parameter control resolves the contradiction by identifying the optimal phosphorus content level that balances performance enhancement with viscosity stability.
Data Source
AI summary
Provided is a dispersion of polymer particles comprising, as polymerized units, by dry weight based on total dry weight of the polymer particles, from 85％ to 99.9％ ethylenically unsaturated nonionic monomers, from 0.01％ to 4％ phosphorous-containing (meth) acrylate monomers, and at least one neutralizer. The final pH of the polymer dispersion is above 6, and from 50％ to 100％ by mole of the total neutralizers are alcohol amines. It further provides a paint comprising said dispersion. The paint has both satisfactory paint viscosity stability and improved paint performances such as scrub resistance, stain resistance, corrosion resistance and durability.