Deep Base Paint Viscosity Stability via Associative Thickener
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Solution Overview
Problem
Deep base paints, especially high gloss and semi-gloss varieties, experience significant viscosity changes when colorants are added, affecting application properties such as sag resistance, leveling, and film build, making it challenging for formulators to maintain consistent product quality and performance.
Innovation Solution
A deep base paint composition comprising an aqueous dispersion of 10-60 weight percent acrylic-based polymer particles, 2-20 weight percent colorant, 0.05-2 weight percent associative thickener with a hydrophobic portion having a calculated log P of 2.7-4.8, and a substantial absence of extenders, which reduces viscosity sensitivity to colorant addition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If colorant is added to deep base paint, then coloration is achieved, but viscosity changes significantly affecting application properties
Solution Approach 1:
The patent introduces an intermediary substance - a specifically designed thickener - that mediates between the colorant addition and the paint's viscosity. This thickener acts as a buffer that absorbs the viscosity changes caused by colorant addition, maintaining stable rheology while allowing coloration to proceed. The thickener's molecular structure interacts with both the polymer particles and colorant, creating a stabilizing effect that prevents extreme viscosity fluctuations.
Solution Approach 2:
The patent applies parameter changes by carefully controlling the concentration ranges of key components: polymer particles (10-60 wt%), colorant (2-20 wt%), and thickener (0.05-2 wt%). By optimizing these parameters and their interactions, the formulation achieves viscosity stability across different colorant loadings. The specific parameter ranges are designed to maintain the paint's rheological properties while allowing for color variation.
2Ease of manufacture
If high levels of colorant are used in deep base paint, then desired color depth is achieved, but paint rheology becomes overly sensitive to colorant addition
Solution Approach 1:
The thickener serves as a protective intermediary that shields the paint system from the destabilizing effects of high colorant levels. It creates a buffered environment where even significant colorant additions (2-20 wt%) do not cause extreme rheological changes. This mediator ensures reliable performance across the full range of color depths achievable in deep base paints.
Solution Approach 2:
The patent creates a composite paint system combining polymer particles, colorant, and thickener in specific proportions. This composite formulation leverages the synergistic effects of the components: the polymer provides the base structure, the colorant provides coloration, and the thickener provides rheological control. The composite approach allows high colorant loading while maintaining stable paint behavior through the combined properties of all components.
3Stability of the object's composition
If viscosity is made insensitive to colorant addition, then application properties are maintained, but formulation complexity increases
Solution Approach 1:
The patent achieves viscosity insensitivity through parameter optimization rather than complex formulation. By adjusting the concentration ranges of polymer particles (10-60 wt%), colorant (2-20 wt%), and thickener (0.05-2 wt%), the formulation naturally resists viscosity changes. This parameter-based approach provides stability without requiring complex interaction mechanisms or multiple functional additives.
Solution Approach 2:
The thickener is applied at a relatively low concentration (0.05-2 wt%) compared to the other components, indicating that only a small amount of this specific functional material is needed to achieve the desired viscosity stability. This localized quality approach - using a small amount of specialized thickener within a broader matrix of polymer and colorant - provides effective rheological control without proportionally increasing overall formulation complexity.
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 composition exhibits improved viscosity stability upon tinting, minimizing adverse changes in paint rheology and ensuring consistent application properties and product quality.
Implementation Method 1
an associative thickener with a hydrophobic portion having a calculated log P in the range of from 2.7 to 4.8
Data Source
AI summary
The present invention relates to a deep base paint composition comprising a binder (an aqueous dispersion of polymer particles), an associative thickener with a hydrophobic portion having a calculated log P in the range of from 2.7 to 4.8. The composition of the present invention provides a mechanism for decreasing the viscosity sensitivity of a base paint to colorant addition.