Scuff-Resistant Coating Composition With Rounded Extender Particles
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Solution Overview
Problem
Conventional architectural coatings, particularly those with high amounts of inorganic mineral extenders, are susceptible to scratch and mar damage due to the irregular shapes of these extenders, which can snag and dislodge, compromising the coating's durability and appearance.
Innovation Solution
The use of first and second extender particles with narrow particle size distribution and rounded shapes, combined with a polysiloxane dispersible in water, to create a smooth coating surface that resists scuffing and marring, while maintaining other coating properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional inorganic mineral extenders with irregular shapes are used to achieve flat or matte finish, then the coating obtains the desired appearance, 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 shapes. The extender particles are specified to have a roundness factor of at least 0.5, meaning they are substantially spherical or rounded rather than angular. This curvature prevents the particles from snagging and dislodging under stress, thereby maintaining scratch and mar resistance while still achieving the desired flat or matte appearance through light scattering.
2Quantity of substance
If high amounts of inorganic mineral extenders are added to achieve deep base and ultra deep base formulations, then the coating obtains the desired color depth and finish, but the coating surface becomes rough and more susceptible to damage
Solution Approach 1:
The patent applies parameter changes by modifying the physical parameters of the extender particles, specifically their shape (roundness factor ≥ 0.5) and size distribution (narrow span). These parameter changes allow the use of high amounts of extenders for deep base formulations while maintaining a smooth surface. The rounded shape and controlled size distribution prevent particle aggregation and surface roughness, thereby preserving surface durability even at high extender concentrations.
3Ease of manufacture
If inorganic mineral extenders are used as fillers in deep base coatings, then the coating achieves the desired pigment volume concentration, but the coating becomes more vulnerable to scuff and mar damage
Solution Approach 1:
The patent applies local quality by ensuring uniform distribution of extender particles with specific properties (roundness factor ≥ 0.5, narrow size span) throughout the coating matrix. This local uniformity prevents clustering of irregular particles that would create weak points susceptible to damage. The consistent local quality of rounded particles throughout the coating provides uniform scuff and mar resistance across the entire surface.
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.