Mar-Resistant Aqueous Polymer Dispersion Coatings
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Solution Overview
Problem
High traffic area coatings, such as hallways and stairwells, require mar resistance while maintaining desired gloss levels, but existing satin or semi-gloss paints with inorganic extenders like nepheline syenite and calcium carbonate exacerbate marring issues.
Innovation Solution
An aqueous dispersion of specific acrylic, styrene-acrylic, or vinyl ester polymer particles and polymeric organic crosslinked microspheres, with controlled particle sizes and phosphorus acid monomer content, is used to create a mar-resistant coating without inorganic extenders, achieving improved gloss retention and resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If inorganic extenders (nepheline syenite, diatomaceous earth, calcium carbonate) are incorporated to control gloss to desired finish, then gloss control is improved, but mar resistance deteriorates
Solution Approach 1:
The patent removes inorganic extenders (nepheline syenite, diatomaceous earth, calcium carbonate) from the coating formulation entirely, replacing them with organic crosslinked microspheres that provide both gloss control and mar resistance without the marring problems of inorganic particles
Solution Approach 2:
The patent uses a composite system combining acrylic polymer particles, styrene-acrylic or vinyl ester polymer particles, and polymeric organic crosslinked microspheres to achieve both desired gloss and superior mar resistance simultaneously, eliminating the need for problematic inorganic extenders
2Illumination intensity
If higher sheen (satin) paints are used to control gloss, then gloss control is improved, but marring is exacerbated
Solution Approach 1:
The patent extracts and eliminates inorganic extenders that cause marring in satin paints, replacing them with organic microspheres that maintain gloss control without exacerbating marring issues
Solution Approach 2:
The patent changes the fundamental material composition from inorganic to organic particles, altering the interaction with surfaces and eliminating the marring problem while maintaining desired gloss levels
Data Source
AI summary
The present invention is a composition comprising an aqueous dispersion of first and second polymer particles; and polymeric organic crosslinked microspheres; wherein, the weight-to-weight ratio of second polymer particles to first polymer particles is in the range of from 50:50 to 80:20; and wherein the weight-to-weight ratio of the microspheres to the first and second polymer particles is in the range of from 3:97 to 20:80. The composition of the present invention is useful semi-gloss or satin paint formulations with excellent mar resistance.