Durable antimicrobial coating composition

Patent metadata

Field	Value
Publication number	US-9957396-B2
Application number	US-201414555596-A
Country	US
Kind code	B2
Filing date	Nov 27, 2014
Priority date	Jul 31, 2014
Publication date	May 1, 2018
Grant date	May 1, 2018

Abstract

The presently claimed invention provides a coating composition for an antimicrobial coating, and a method for synthesizing the coating composition. A coating method for deposition of the antibacterial coating is also provided. The antimicrobial coating of the present invention is effective in providing antimicrobial function, easy to be manufactured, stable and durable.

First claim

The invention claimed is:

1. A method of preparing a coating composition, comprising the steps of: providing a silver nanoparticle dispersion and chlorhexidine;
dissolving chitosan in an acidic organic solvent to form a chitosan solution; incubating a chitosan cross-linker with the chitosan solution to form a solution of crosslinked chitosan; and
mixing the silver nanoparticle dispersion and chlorhexidine with the solution of crosslinked chitosan to form said coating composition,
wherein the acidic organic solvent is acetic acid and the chitosan cross-linker is glutaraldehyde; and
wherein said coating composition comprises 0.0002%-0.001% w/v of silver nanoparticles, 0.48%-1.9% w/v chitosan, 0.48-1.9% v/v acetic acid, 0.05%-0.2% v/v chlorhexidine and 0.06%-0.35% glutaraldehyde v/v.

2. A coating composition that forms a durable, stable and antimicrobial coating on a surface and air dries at room temperature without curing, wherein the coating composition is prepared by the method of claim 1 .

3. The coating composition of claim 2 , wherein the coating composition comprises 0.001% w/v of silver nanoparticles, 0.80% w/v chitosan, 0.80% v/v acetic acid, 020% v/v chlorhexidine, 0.24% v/v glutaraldehyde and 97.96% v/v water.

4. A method for depositing an antimicrobial coating onto at least a surface of an object comprising the steps of: providing an object, applying one or more layers of the coating composition prepared by the method of claim 1 onto said surface and, air drying the coating composition at room temperature without curing.

5. The method of claim 4 , wherein said air drying the coating composition takes less than 60 mins.

6. The method of claim 4 , wherein the antimicrobial coating has antimicrobial property comprising inhibiting growth of virus, fungi, gram-positive bacteria, gram-negative bacteria, MRSA and ESBL-type bacteria and endospore of bacteria.

7. The method of claim 4 , wherein the surface comprises glass, wood, plastic, ceramic or metal.

8. The method of claim 4 , wherein the applying comprises spraying or spreading.

9. A durable, stable and antimicrobial surface formed by the method of claim 4 .

Assignees

• Nano & Advanced Materials Inst Ltd

Inventors

• Huen Ngar Yee
• Kwok Connie Sau Kuen
• Cheuk Wah Kit

Classifications

• C04B2111/2092

  Resistance against biological degradation · CPC title

• C04B41/5116

  Ag or Au · CPC title

• C04B41/009

  characterised by the material treated · CPC title

• B05B7/00

  Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas (B05B3/00, B05B5/00 {, B05B11/06} take precedence) · CPC title

• A01N47/44

  Guanidine; Derivatives thereof · CPC title