Polyvinyl Acetate Dispersion with Phosphorus and Itaconic Acid for Paint Stability
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Solution Overview
Problem
Poly(vinyl acetate) dispersions in paint formulations face challenges in providing competitive washability and early chalking resistance, especially at high pigment volume concentrations (PVC) above 60%, with phosphorus-containing monomers improving washability but introducing stability issues.
Innovation Solution
A polymer dispersion comprising 60-95% vinyl acetate, 0.2-2.5% phosphorus-containing allylic monomer, and 0.2-2.5% itaconic acid, with a specific dry weight ratio, is used to create a paint formulation with improved washability, stability, and early chalking resistance, incorporating suitable ethylenically unsaturated nonionic and stabilizing monomers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phosphorus-containing monomer is added to improve washability, then washability is improved, but paint stability deteriorates
Solution Approach 1:
The patent combines phosphorus-containing allylic monomer (providing washability) with itaconic acid monomer (providing stability) in specific proportions (0.2-2.5% each, with ratio 0.2-0.6) to create a synergistic effect that achieves both improved washability and maintained paint stability, resolving the contradiction between these two properties
Solution Approach 2:
The patent optimizes the concentration parameters of phosphorus-containing monomer (0.2-2.5%) and itaconic acid monomer (0.2-2.5%), and their ratio (0.2-0.6), to achieve the optimal balance between washability improvement and stability maintenance. This parameter optimization allows the system to operate in a regime where both contradictory requirements are satisfied
2Ease of manufacture
If poly(vinyl acetate) dispersion is used to reduce cost and improve hiding efficiency, then cost-efficiency and hiding efficiency are improved, but washability and early chalking resistance deteriorate
Solution Approach 1:
The patent creates a composite polymer dispersion system by incorporating phosphorus-containing allylic monomer and itaconic acid monomer into poly(vinyl acetate) dispersion. This composite approach maintains the cost-efficiency and hiding efficiency of PVA while adding the functional benefits of phosphorus-containing compounds for washability and itaconic acid for stability, thus resolving the contradiction between cost-efficiency and performance
3Ease of manufacture
If poly(vinyl acetate) dispersion is used to reduce cost and improve hiding efficiency, then cost-efficiency and hiding efficiency are improved, but early chalking resistance deteriorates
Solution Approach 1:
The patent combines poly(vinyl acetate) dispersion (providing cost-efficiency and hiding efficiency) with itaconic acid monomer (providing early chalking resistance through crosslinking capability) and phosphorus-containing monomer (providing additional stability). This combination maintains the economic advantages of PVA while adding the durability benefits needed to resist early chalking
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 formulation achieves enhanced washability, stability, and early chalking resistance, as demonstrated by improved performance in tests such as paint drawdown cycles, viscosity stability, and chalk rating, while maintaining paint stability and opacity.
Implementation Method 1
a polymer dispersion of polymer particles comprising by dry weight based on total dry weight of the polymer particles, a) from 60% to 95% a vinyl acetate monomer, b) from 0.2% to 2.5% a phosphorus-containing allylic monomer; and c) from 0.2% to 2.5% an itaconic acid monomer
Data Source
AI summary
The present invention provides a polymer dispersion comprising by dry weight based on total dry weight of the polymer dispersion, a) from 60％ to 95％ a vinyl acetate monomer, b) from0.2％ to 2.5％ a phosphorus-containing allylic monomer； and c) from 0.2％ to 2.5％ an itaconic acid monomer； wherein the total amount of monomers b) and c) is from 0.5％ to 2.5％by dry weight based on total dry weight of the polymer dispersion, and the dry weight ratio of monomer b) to monomers b) and c) is from 0.2 to 0.6. The present invention further provides a paint formulation of PVC higher than 60％ comprising the polymer dispersion.