Polycarboxylic Acid Coating for Effect Pigment Alignment
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Solution Overview
Problem
Existing multicoat paint systems face challenges in achieving a high flop index without using polyamides and/or metal silicates, while maintaining good optical and coloristic properties, leveling, and storage stability, especially when processed by the 'wet-on-wet' method.
Innovation Solution
An aqueous coating composition comprising anionically stabilized binder, effect pigment, polycarboxylic acid, and solvent, which allows for a high flop index without polyamides and/or metal silicates, by ensuring homogeneous incorporation of the polycarboxylic acid and effective orientation of metallic pigments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If polyamides and/or metal silicates are used to achieve high flop index, then metallic pigment orientation is improved, but device complexity and formulation complexity increase
Solution Approach 1:
The patent removes polyamides and metal silicates from the formulation and replaces them with a polycarboxylic acid-based system. This extraction of unnecessary components simplifies the formulation while maintaining the high flop index effect through the essential polycarboxylic acid mechanism.
Solution Approach 2:
The invention changes the chemical parameters of the coating system by using polycarboxylic acid with specific molecular weight ranges (100-1000 g/mol) and controlled carboxyl group content. This parameter optimization achieves effective pigment orientation without requiring complex additive packages.
2Manufacturing precision
If polycarboxylic acid is added to aqueous coating composition, then effect pigment orientation is improved, but storage stability may be affected
Solution Approach 1:
The patent specifies precise parameter ranges for the polycarboxylic acid including molecular weight (100-1000 g/mol) and carboxyl group content (1-10 mmol/g) to optimize both pigment orientation and storage stability. These controlled parameters prevent excessive interaction with other formulation components while maintaining effectiveness.
Solution Approach 2:
The invention uses a simplified polycarboxylic acid system that replicates the orientation-effect mechanism of more complex polyamide and metal silicate systems without their associated stability problems. The polycarboxylic acid provides the same functional outcome with better compositional stability.
3Ease of manufacture
If aqueous basecoating compositions are used for economic and environmental reasons, then cost and environmental impact are reduced, but processing stability and defect prevention become more challenging
Solution Approach 1:
The patent employs a self-regulating system where the polycarboxylic acid automatically provides pigment orientation and film stability through its chemical structure. The system is self-sufficient without requiring additional polyamides or metal silicates, thereby maintaining processing stability while preserving the economic and environmental advantages of aqueous formulations.
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 solution achieves a high flop index with good optical and coloristic properties, leveling, and high storage stability, making it suitable for multicoat paint systems processed by the 'wet-on-wet' method.
Implementation Method 1
the at least one polycarboxylic acid PC is homogeneously incorporated into the aqueous coating composition
Implementation Method 2
effective orientation of metallic pigments
Data Source
AI summary
Described herein are an aqueous coating composition including at least one anionically stabilized binder, effect pigment, polycarboxylic acid, and solvent, and a method for producing a multicoat paint system by producing a basecoat directly on a substrate, producing a clearcoat directly on the basecoat, and then jointly curing the basecoat and the clearcoat. At least one of the basecoat materials includes the aqueous coating. Also described herein are multicoat paint system obtainable by this method, and the use of at least one polycarboxylic acid in an aqueous coating composition for improving the effect pigment orientation, or for color matching.