Scuff and Mar Resistant Coating Composition with Rounded Extenders
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Solution Overview
Problem
Conventional architectural coatings, particularly those with high amounts of inorganic mineral extenders, are susceptible to scratches and scuffs due to the irregular shapes of these extenders, which can snag and damage the coating surface, while maintaining high extender content is necessary for desired properties like matte appearance and opacity.
Innovation Solution
The use of specifically designed first and second extender particles with rounded shapes, narrow particle size distribution, and high hardness, combined with a polysiloxane dispersible in water, to create a coating composition that provides improved scuff and mar resistance without compromising other coating properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional inorganic mineral extenders with irregular shapes are used to achieve matte appearance and opacity, then the coating achieves desired aesthetic properties, but the coating becomes more susceptible to scratch and mar damage
Solution Approach 1:
The patent applies spheroidality by using extender particles with rounded shapes instead of irregular angular shapes. The extender particles are specified to have rounded shapes that lack sharp edges and points, which prevents snagging and reduces scratch and mar damage while maintaining the matte appearance and opacity properties through light scattering.
2Quantity of substance
If high amounts of inorganic mineral extenders are added to achieve desired opacity and matte finish, then the coating achieves aesthetic goals, but the coating surface becomes rough and more susceptible to damage
Solution Approach 1:
The patent applies parameter changes by modifying the shape parameter of extender particles from irregular angular shapes to rounded shapes. This parameter change allows the coating to maintain high extender content for opacity and matte finish while the rounded shapes prevent surface roughness and reduce susceptibility to scratch and mar damage.
3Ease of manufacture
If conventional extender particles with irregular shapes are used, then the coating achieves cost-effective formulation, but the coating requires higher polymer content to achieve adequate scuff resistance
Solution Approach 1:
The patent applies parameter changes by modifying the shape parameter of extender particles to rounded shapes, which inherently provides scuff and mar resistance without requiring increased polymer content. This maintains cost-effective formulation while achieving the desired reliability.
Data Source
AI summary
Coating compositions and extender packages for coating compositions that include first polymeric or inorganic extender particles, second polymeric or inorganic extender particles, and a polysiloxane dispersible in water. Both the first and second extender particles are relatively hard and have a narrow particle size distribution.