Phosphorus Acid Functionalized Latex Binder for Paint Rheology Control
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Solution Overview
Problem
The increasing cost of titanium dioxide (TiO2) in paint formulations has led to a need for more efficient use of this pigment while maintaining opacity, as traditional thickeners struggle to adjust viscosity effectively with phosphorus acid functionalized emulsion polymer particles that exhibit acorn morphology, affecting rheological responses at high shear rates.
Innovation Solution
A composition comprising an aqueous dispersion of an associative thickener with a hydrophobic portion and phosphorus acid functionalized polymer particles adsorbed to TiO2 particles, featuring a core-shell morphology, allowing for flexible viscosity adjustment and improved paint performance properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If phosphorus acid functionalized emulsion polymer particles with acorn morphology are used to adsorb onto TiO2 particles, then TiO2 efficiency and opacity are improved, but viscosity control capability deteriorates
Solution Approach 1:
The invention changes the physical-chemical parameters of the polymer particles by introducing acorn morphology with protuberances, which alters the adsorption characteristics onto TiO2 particles. This morphological parameter change enables efficient TiO2 spacing while maintaining rheological control through the specific surface area and adsorption density of the protuberance structures.
Solution Approach 2:
The invention creates a composite system consisting of polymer particles with acorn morphology adsorbed onto TiO2 particles. This composite structure combines the opacity-providing TiO2 with the viscosity-modifying polymer, achieving both efficient pigment utilization and controllable rheology through the synergistic interaction between the composite components.
2Quantity of substance
If traditional thickeners are used with phosphorus acid functionalized polymer particles, then TiO2 efficiency is improved, but rheological response at high shear rates deteriorates
Solution Approach 1:
The invention applies local quality by creating protuberances at specific locations on the polymer particle surfaces. These localized protuberance regions provide enhanced adsorption sites onto TiO2 particles while maintaining the bulk polymer's viscosity-modifying properties, thus achieving both TiO2 efficiency and reliable rheological response across different shear rates.
Solution Approach 2:
The polymer particles are segmented into core-shell structures with protuberances, where the core provides bulk viscosity modification and the segmented protuberance regions provide localized adsorption onto TiO2. This segmentation allows independent optimization of TiO2 efficiency and rheological response characteristics.
3Quantity of substance
If volume solids content is increased to improve paint performance, then opacity and coverage are improved, but viscosity adjustment flexibility deteriorates
Solution Approach 1:
The invention utilizes parameter changes in the polymer particle morphology (acorn structure with protuberances) to decouple the relationship between volume solids content and viscosity adjustment flexibility. The specific surface area and adsorption characteristics of the acorn-shaped particles allow efficient TiO2 spacing even at higher solids contents, maintaining rheological control flexibility across a broader range of volume solids.
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 composition enables efficient use of TiO2, balancing paint performance properties by allowing for targeted viscosity adjustments at high shear rates without exceeding targets at low and mid shear rates, enhancing flexibility in using low and mid shear rate thickeners and optimizing sag resistance, flow/leveling, and heat age stability.
Implementation Method 1
adsorbing phosphorus acid functionalized emulsion polymer particles to the surfaces of the TiO 2 particles
Implementation Method 2
an associative thickener having a hydrophobic portion with a calculated log P in the range of from 2.7 to 5.0
Data Source
AI summary
The present invention relates to a composition comprising an aqueous dispersion of an associative thickener having a hydrophobic portion with a calculated log P in the range of from 2.7 to 5.0; and composite particles comprising phosphorus acid functionalized polymer particles adsorbed to the surfaces of TiO2 particles; wherein the phosphorus acid functionalized polymer particles have a core-shell morphology wherein the core protuberates from the shell. The composition of the present invention provides formulators with flexibility in their use of low and mid shear rate thickeners to balance paint performance properties.