Coating with infrared and ultraviolet blocking characterstics

• US 20070065670A1
• Filed: 09/20/2005
• Published: 03/22/2007
• Est. Priority Date: 09/20/2005
• Status: Active Grant

• Current Assignee: Guardian Glass LLC (KOCH Industries Incorporated)
• Original Assignee: Guardian Industries Corporation (KOCH Industries Incorporated)
• Inventors: Varaprasad, Desaraju
• Granted Patent: US 7,659,001 B2
• Time in Patent Office: Days
• US Class Current: 428/432
• CPC Class Codes: C03C 17/04 by fritting glass powder
• CPC Class Codes: C03C 17/3411 with at least two coatings of inorganic materials C03C17/36, C03C17/42 take precedence
• CPC Class Codes: C03C 17/3417 all coatings being oxide coatings
• CPC Class Codes: C03C 2217/452 Glass
• CPC Class Codes: C03C 2217/475 Inorganic materials
• CPC Class Codes: C03C 2217/74 UV-absorbing coatings
• CPC Class Codes: C03C 2218/365 Coating different sides of a glass substrate
• CPC Class Codes: C03C 8/14 Glass frit mixtures having non-frit additions, e.g. opacifiers, colorants, mill-additions
• CPC Class Codes: G02B 5/021 the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
• CPC Class Codes: G02B 5/0278 used in transmission
• CPC Class Codes: G02B 5/0294 adapted to provide an additional optical effect, e.g. anti-reflection or filter
• CPC Class Codes: G02B 5/208 for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation

Abstract

A composite oxide coating is provided that efficiently blocks both ultraviolet (UV) and infrared (IR) radiation. Certain embodiments of this invention relate to a coating having IR and UV blocking characteristics. In certain example embodiments, the coating includes a silica matrix, zinc antimonite, and a UV blocking material such as cerium oxide, thereby permitting the coating after application to block significant amounts of both IR and UV radiation.

Claims

1. A coated article formed by applying a coating sol to a glass substrate to form a coating on the glass substrate, the coating for blocking significant amounts of infrared (IR) and ultraviolet (UV) radiation, the coating comprising:

silicon oxide;

from about 5-35%

cerium oxide;

from about 10-50%

zinc antimonate;

from about 30-70%.

2. The coated article of claim 1, wherein the coated article has a transmission at 2300 nm of less than 10%.

3. The coated article of claim 1, wherein the coating comprises:

silicon oxide;

from about 10-30%

cerium oxide;

from about 20-45%

zinc antimonate;

from about 35-65%.

4. The coated article of claim 1, wherein the coating comprises:

silicon oxide;

from about 10-30%

cerium oxide;

from about 30-40%

zinc antimonate;

from about 40-55%.

5. The coated article of claim 1, wherein the coated article has a transmission at 600 nm of at least about 60%.

6. The coated article of claim 1, wherein the coated article has a transmission at 600 nm of at least about 70%.

7. The coated article of claim 1, wherein the coated article has a transmission at 1700 nm of no greater than 30%.

15. The coated article of claim 1, wherein the coating is electrically conductive.

16. The coated article of claim 1, wherein the coated article has an average transmission in the range of 300-380 nm of no more than about 10%.

17. The coated article of claim 1, wherein the coating is provided directly on and contacting the glass substrate.

8. A coated article comprising a coating applied to a substrate, the coating comprising:

silicon oxide;

from about 5-35%

nanoparticles of a UV absorbing material;

from about 10-50% zinc antimonate;

from about 30-70%.

9. The coated article of claim 8, wherein the coated article has an average transmission in the range of 300-380 nm of less than 20%.

10. The coated article of claim 8, wherein the UV absorbing material comprises cerium oxide and wherein the coating comprises:

silicon oxide;

from about 10-30%

cerium oxide;

from about 20-45%

zinc antimonate;

from about 35-65%.

11. The coated article of claim 10, wherein the coating comprises:

silicon oxide;

from about 10-30%

cerium oxide;

from about 30-40%

zinc antimonate;

from about 40-55%.

12. The coated article of claim 8, wherein the coated article has a transmission at 600 nm of at least about 60%.

13. The coated article of claim 8, wherein the coated article has a transmission at 600 nm of at least about 70%.

14. The coated article of claim 8, wherein the coated article has a transmission at 1700 nm of no greater than 30%.

18. A coated article comprising a ion applied to a substrate to form a coating for blocking significant amounts of IR and UV radiation, the coating comprising at least one IR blocking material and at least one UV blocking material.

19. The coated article of claim 18, wherein the coating comprises zinc antimonite, cerium oxide, and silicon oxide such as SiO₂.

20. A method of making a coated article, the method comprising:

mixing a zinc compound, cerium oxide and a colloidal antimony oxide; and

calcining the mixture in a gas to produce an electrically conductive coating.

21. The method of claim 20, wherein the zinc compound and colloidal antimony oxide has a ZnO/Sb₂O₃ molar ratio of from about 0.8 to 1.2.

22. The method of claim 20, wherein the gas comprises air and/or nitrogen.