Chemical vapor deposition of a reflective film on the bottom surface of a float glass ribbon

• US 4,900,110 A
• Filed: 12/16/1985
• Issued: 02/13/1990
• Est. Priority Date: 07/30/1984
• Status: Expired due to Fees

• Current Assignee: PPG Industries Incorporated (Nouryon BV)
• Original Assignee: PPG Industries Incorporated (Nouryon BV)
• Inventors: Sleighter, George E.
• Primary Examiner(s): Schwartz, Pamela R.
• Application Number:
  US06/809,646
• Time in Patent Office: 1,520 Days
• Field of Search: 428/432, 350/1.6, 350/164, 350/1.7, 350/163, 350/166
• US Class Current: 359/360
• CPC Class Codes: B05C 9/04 for applying liquid or other fluent material to opposite sides of the work
• CPC Class Codes: C03C 17/002 for flat glass, e.g. float glass
• CPC Class Codes: C03C 17/245 by deposition from the vapour phase
• CPC Class Codes: C03C 2217/211 SnO2
• CPC Class Codes: C03C 2217/212 TiO2
• CPC Class Codes: C03C 2218/152 by cvd
• CPC Class Codes: C23C 16/545 for coating elongated substrates
• CPC Class Codes: Y10S 359/90 Methods

Abstract

A coated glass article is disclosed wherein the interference color infrared-reflective film on one surface of a glass substrate are masked by depositing a uniform higher reflecting metal-containing film on the bottom surface of a glass ribbon by chemical vapor deposition.

Claims

1. A coated glass article produced by a process comprising the steps of:

a. coating a transparent glass substrate on one surface thereof with an infrared reflective film which alone exhibits interference color effects in reflectance; and

b. substantially simultaneously depositing by chemical vapor deposition on the opposite surface of said glass substrate a nonadjacent, nonabsorbing second film with sufficiently uniform visible reflectance sufficiently higher than the visible reflectance of the infrared reflective film to mask the interference color effects of said infrared reflective film.

2. A coated glass article according to claim 1, wherein said infrared reflective film is tin oxide.

3. A coated glass article according to claim 2, wherein said tin oxide film has a luminous reflectance in the range of 8 to 12 percent.

4. A coated glass article according to claim 3, wherein said tin oxide film exhibits a blue interference color effect.

5. A coated glass article according to claim 4, wherein said second film comprises an oxide of a metal selected from the group consisting of tin, titanium, colbalt, iron, chromium and mixtures thereof.

6. A coated glass article according to claim 5, wherein said film comprises a metal oxide selected from the group consisting of tin oxide and titanium oxide.

7. A coated glass article according to claim 6, wherein said film is titanium oxide.

8. A coated glass article according to claim 6 wherein said film comprises tin oxide.

9. A coated article according to claim 8, wherein said tin oxide film has a luminous reflectance of at least about 15 percent.

10. A coated glass article according to claim 9, wherein said film has a luminous reflectance in the range of 18 to 21 percent.

11. A coated glass article according to claim 1, wherein said transparent glass substrate comprises clear glass.

12. A coated glass article according to claim 11, wherein said coated glass article has a luminous transmittance in the range of 68 to 72 percent.