Composition and method to form a self decontaminating surface

• US 9,757,769 B2
• Filed: 04/16/2012
• Issued: 09/12/2017
• Est. Priority Date: 04/15/2011
• Status: Active Grant

• Current Assignee: SRFC Bio Incorporated
• Original Assignee: Allied Bioscience, Inc.
• Inventors: Grossman, Craig, Ngo, Mai, Wysocki, Ronald
• Primary Examiner(s): Rodriguez, Michael P
• Application Number:
  US13/448,325
• Publication Number:
  US 20120291667A1
• Time in Patent Office: 1,975 Days
• Field of Search: None
• CPC Class Codes: A01N 55/00 Biocides, pest repellants or attractants, or plant growth regulators, containing organic compounds containing elements other than carbon, hydrogen, halogen, oxygen, nitrogen and sulfur containing organo-phosphorus compounds A01N57/00
• CPC Class Codes: A01N 55/02 containing metal atoms
• CPC Class Codes: B05D 1/02 performed by spraying
• CPC Class Codes: B05D 1/04 involving the use of an electrostatic field B05D1/025 and B05D1/14 take precedence
• CPC Class Codes: B05D 2425/01 top layer/ last layer, i.e. first layer from the top surface
• CPC Class Codes: B05D 2601/24 Titanium dioxide, e.g. rutile
• CPC Class Codes: B05D 5/00 Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
• CPC Class Codes: B05D 7/52 Two layers
• CPC Class Codes: C07F 7/28 Titanium compounds
• CPC Class Codes: C08G 77/26 nitrogen-containing groups
• CPC Class Codes: C08G 79/00 Macromolecular compounds obtained by reactions forming a linkage containing atoms other than silicon, sulfur, nitrogen, oxygen, and carbon with or without the latter elements in the main chain of the macromolecule
• CPC Class Codes: C09D 183/08 containing silicon bound to organic groups containing atoms other than carbon, hydrogen, and oxygen
• CPC Class Codes: C09D 185/00 Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing atoms other than silicon, sulfur, nitrogen, oxygen, and carbon; Coating compositions based on derivatives of such polymers
• CPC Class Codes: C09D 5/00 Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced electrically insulating plastics, resins or waxes H01B3/30; Filling pastes
• CPC Class Codes: C09D 5/14 Paints containing biocides, e.g. fungicides, insecticides or pesticides C09D5/16 takes precedence
• CPC Class Codes: C09D 7/41 Organic pigments; Organic dyes
• CPC Class Codes: D06M 11/46 Oxides or hydroxides of elements of Groups 4 or 14 of the Periodic Table; Titanates; Zirconates; Stannates; Plumbates
• CPC Class Codes: D06M 13/51 Compounds with at least one carbon-metal or carbon-boron, carbon-silicon, carbon-selenium, or carbon-tellurium bond
• CPC Class Codes: D06M 13/513 with at least one carbon-silicon bond
• CPC Class Codes: D06M 15/423 Amino-aldehyde resins
• CPC Class Codes: D06M 23/005 : Applying monomolecular films on textile products like fibres, threads or fabrics

Abstract

A method to prepare a self-decontaminating surface, where that method includes disposing a first coating on a surface, where that first coating comprises an organosilane, and disposing a second coating over the first coating, where the second coating comprises TiO₂.

Claims

1. A method of forming a self-decontaminating coating on a surface, comprising the steps of:

(1) coating a surface with an aqueous mixture comprising 3-(trimethoxysilyl)propyldimethyloctadecyl ammonium chloride; and

(2) subsequently coating the surface with an aqueous colloidal suspension of TiO₂ thus forming said self-decontaminating coating on said surface,

wherein said self-decontaminating coating exhibits a reduction in bacteria after initial inoculation of the coating with bacteria.

2. The method of claim 1, wherein said surface comprises formica.

3. The method of claim 1, wherein said aqueous colloidal suspension further comprises an oxidizable pigment.

4. The method of claim 3, wherein said pigment is oxidizable by TiO₂.

5. The method of claim 3, wherein said pigment comprises methylene blue.

6. The method of claim 1, wherein step (2) follows step (1) by about 15 minutes.

7. The method of claim 1, wherein said aqueous colloidal suspension of TiO₂ comprises a 3 weight percent TiO₂ suspension in water.

8. The method of claim 1, wherein said aqueous mixture comprises a 3.6 weight percent solution of 3-(trimethoxysilyl)propyldimethyloctadecyl ammonium chloride in water.

9. The method of claim 1, wherein said reduction in bacteria comprises an about 2.3 log reduction in Methicillin Resistant Staphylococcus Aureus (MRSA) after initial inoculation of the treated surface with MRSA.

10. The method of claim 1, wherein said reduction in bacteria comprises an about 2.3 log reduction in Methicillin Resistant Staphylococcus Aureus (MRSA) about 3 hours after initial inoculation of the treated surface with MRSA.