Patent ID: 11873417
Assignee: UNIVERSITY OF HOUSTON SYSTEM
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 0:
1. A method for preparing an antibacterial polyurethane coating, 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.