Polymeric Particles with Copolymerized Macromers for Latex Paint Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current polymerizable surfactants used in latex paints are difficult to incorporate into polymeric particles due to their water-soluble nature, leading to insufficient stability and performance issues such as water sensitivity and low incorporation into films.
Innovation Solution
The use of copolymerized macromers with a cloud point below the emulsion polymerization temperature, allowing for improved incorporation and stability by forming an aqueous dispersion of polymeric particles with specific molecular weight and cloud point ranges, enhancing stability and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymerizable surfactants are used to improve stability and performance of latex paints, then divalent ion stability, solvent shock stability, and film properties are improved, but the water-soluble nature of these surfactants makes them difficult to incorporate into polymeric particles, leading to water sensitivity in films
Solution Approach 1:
The patent changes the solubility parameter of the surfactant by using copolymerized macromers with cloud points below the polymerization temperature. This parameter change allows the surfactant to be incorporated into polymeric particles during emulsion polymerization, eliminating water sensitivity while maintaining stability and performance benefits
Solution Approach 2:
The patent creates a composite material system combining copolymerized macromers with specific monomers (such as styrene, butadiene, or vinyl acetate) to form polymeric particles that incorporate surfactant functionality. This composite approach integrates the stability benefits of surfactants with the water-insolubility of polymeric particles
2Ease of manufacture
If copolymerized macromers with cloud point below polymerization temperature are used, then incorporation into polymeric particles is improved and water sensitivity is eliminated, but the process requires precise control of cloud point and molecular weight parameters
Solution Approach 1:
The patent establishes specific parameter ranges (cloud point between 25-90°C, molecular weight between 1,000-50,000) that simplify process control. By defining these ranges, the patent makes the complex copolymerization process more manageable while ensuring proper incorporation and eliminating water sensitivity
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
This approach significantly enhances the incorporation and stability of polymerizable surfactants, improving the stability and performance of latex paints by ensuring the surfactants are not water-soluble during particle formation, resulting in enhanced divalent ion stability, solvent shock resistance, and improved film properties.
Implementation Method 1
a copolymerized macromer, having a number average molecular weight of between 1,000 and 50,000 and a cloud point in water of between 25° C. and 90° C.
Data Source
AI summary
An aqueous dispersion of polymeric particles and process for making the aqueous dispersion are disclosed. The polymeric particles have at least one ethylenically unsaturated monomer and a copolymerized macromer with a number average molecular weight of between 1,000 and 50,000 and a cloud point in water of between 25° C. and 90° C.