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US 12,760,201 B2Granted
Scalable inter-diffused zwitterionic polyurethanes for durable antibacterial coatings
AssigneeUniversity of Houston System
InventorsHadi Ghasemi, Zixu Huang
Life of this patent
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Abstract
Durable antibacterial coatings are prepared by inter-diffusing zwitterionic polyurethane in acrylic polyurethane. Bacterial attachment is substantially eliminated from the surface of the coatings due to the hydrophilicity of the zwitterionic polyurethane. Long-term antibacterial properties were observed for both Gram-negative and Gram-positive bacteria even when the coatings were constantly challenged by mechanical abrasion.
Claims6
An antibacterial polyurethane coating prepared by a method comprising:
- depositing an acrylic polyurethane base layer on a surface, wherein the acrylic polyurethane base layer is hydrophobic and comprises a ratio of hydroxyl groups to isocyanate groups of about 1.0/1.5;
- allowing the acrylic polyurethane base layer to partially cure, to produce a semi-cured acrylic polyurethane base layer;
- spraying a zwitterionic polyurethane on the semi-cured acrylic polyurethane base layer, wherein the zwitterionic polyurethane is hydrophilic and comprises a ratio of hydroxyl groups to isocyanate groups of about 1.1/1.0;
- allowing the zwitterionic polyurethane to inter-diffuse into the acrylic polyurethane base layer to form an inter-diffused polyurethane coating;
- and
- allowing the inter-diffused polyurethane coating to cure to form an antibacterial polyurethane coating, wherein the antibacterial polyurethane coating has a coating surface that is hydrophilic and lacks isocyanate groups.
3 more elements
An antibacterial polyurethane coating comprising molecules having a structure of:
Dependencies are inferred from the claim text.