Demonstration kit and method for enhancing and/or demonstrating photoactive properties

• US 7,223,523 B2
• Filed: 09/08/2003
• Issued: 05/29/2007
• Est. Priority Date: 09/18/2002
• Status: Expired due to Fees

• Current Assignee: PPG Industries Ohio Incorporated (Nouryon BV)
• Original Assignee: PPG Industries Ohio Incorporated (Nouryon BV)
• Inventors: Boykin, Cheri M., Lin, Chia-Cheng
• Primary Examiner(s): LEE, SIN J
• Application Number:
  US10/657,350
• Publication Number:
  US 20040096774A1
• Time in Patent Office: 1,359 Days
• Field of Search: 430/270.1, 430/273.1
• US Class Current: 430/273.1
• CPC Class Codes: C03C 17/3405 with at least two coatings of organic materials C03C17/36, C03C17/42 take precedence
• CPC Class Codes: C03C 17/42 at least one coating of an organic material and at least one non-metal coating

Abstract

A method is provided for simulating and/or demonstrating and/or enhancing photoactive properties, such as hydrophilicity, of a surface, such as a photoactive surface. One embodiment includes providing a photoactive surface and applying a peroxide-containing material, such as an aqueous hydrogen peroxide solution, over at least a portion of the surface. An optional resinous layer, such as an at least partly hydrolyzed polymethoxysiloxane layer, can be applied over the surface. A kit to practice the method and an article made using the method are also provided.

Claims

1. A method of simulating photoactive properties on a surface, comprising:

providing a substrate having a surface;

depositing a photoactive coating comprising titania over at least a portion of the surface to provide a photoactive surface, wherein the titania is at least partially crystalline; and

applying at least one peroxide-containing material over at least a portion of the photoactive surface.

2. The method of claim 1, wherein the peroxide-containing material includes hydrogen peroxide.

3. The method of claim 1, wherein the peroxide-containing material is an aqueous solution of hydrogen peroxide.

4. The method of claim 3, wherein the aqueous solution comprises 1 wt. % to 30 wt. % hydrogen peroxide.

5. The method of claim 1, wherein the photoactive coating has a thickness in the range of 10 Å

to 5000 Å

.

6. The method of claim 1, including drying the substrate with the peroxide-containing material.

7. The method of claim 1, wherein the step for applying the peroxide-containing material includes:

applying the peroxide-containing material to an applicator; and

wiping the applicator over the photoactive surface until a substantially uniform layer of the peroxide-containing material is on the photoactive surface.

8. The method of claim 1, including applying an at least partly hydrolyzed polyalkoxysiloxane material over at least a portion of the photoactive surface prior to applying the at least one peroxide-containing material.

9. The method of claim 8, when the polyalkoxysiloxane material comprises at least one at least partly hydrolyzed material selected from polymethoxysiloxane, polyethoxysiloxane, polypropoxysiloxane, polybutoxysiloxane, and mixtures thereof.

10. The method of claim 8, including drying the polyalkoxysiloxane material for 3 minutes to 60 minutes.

11. A method of demonstrating hydrophilicity of a photoactive surface by exposing the surface to electromagnetic radiation having one or more wavelengths of visible light, comprising:

providing a substrate having a photoactive surface comprising titania;

applying at least one at least partly hydrolyzed polyalkoxysiloxane material over at least a portion of the photoactive surface; and

applying at least one peroxide-containing material over at least a portion of the photoactive surface.

12. The method of claim 11, wherein the photoactive surface is a UV photoactive surface.

13. The method of claim 11, including applying the polyalkoxysiloxane material to have a dry film thickness in the range of 1 nm to 5 nm.

14. The method of claim 11, wherein the polyalkoxysiloxane material is an aqueous solution comprising less than or equal to 0.5 wt. % of at least partly hydrolyzed polyalkoxysiloxane.

15. The method of claim 11, wherein the polyalkoxysiloxane material is an aqueous solution comprising about 0.1 wt. % to 0.2 wt. % at least partly hydrolyzed polyalkoxysiloxane.

16. The method of claim 11, wherein the polyalkoxysiloxane material includes at least one at least partly hydrolyzed material selected from polymethoxysiloxane, polyethoxysiloxane, polypropoxysiloxane, polybutoxysiloxane, and mixtures thereof.

17. The method of claim 11, wherein the peroxide material includes hydrogen peroxide.

18. The method of claim 17, wherein the peroxide material is an aqueous solution comprising 1 wt. % to 30 wt. % hydrogen peroxide.

19. The method of claim 11, wherein the photoactive surface comprises crystalline titania.

20. An article, comprising:

a photoactive surface comprising titania;

at least one at least partly hydrolyzed polyalkoxysiloxane material deposited over the photoactive surface; and

at least one peroxide-containing material deposited over the photoactive surface.

21. The article of claim 20, wherein the polyalkoxysiloxane material includes at least one at least partly hydrolyzed material selected from polymethoxysiloxane, polyethoxysiloxane, polypropoxysiloxane, polybutoxysiloxane, and mixtures thereof.

22. The article of claim 20, wherein the peroxide-containing material comprises hydrogen peroxide.