Method of reducing the emissivity of a coated glass article

Patent metadata

Field	Value
Publication number	US-2022204397-A1
Application number	US-202017611289-A
Country	US
Kind code	A1
Filing date	May 20, 2020
Priority date	May 20, 2019
Publication date	Jun 30, 2022
Grant date	—

Abstract

A method of reducing the emissivity of a coated glass article includes the following steps in sequence: (a) forming a coated glass article, the coated glass article comprising a glass substrate and a coating formed on the glass substrate, the coating having a first layer deposited over the glass substrate and a second layer, the second layer being provided between the first layer and the glass substrate, wherein the coated glass article exhibits a first emissivity; and (b) heating the coated glass article in an environment set to a predetermined temperature and for a predetermined period of time. After step (b), the coated glass article exhibits a second emissivity, the second emissivity being less than the first emissivity.

First claim

1 .- 16 . (canceled)

17 . A method of reducing the emissivity of a coated glass article, comprising the following steps in sequence:
(a) forming a coated glass article, the coated glass article comprising a glass substrate and a coating formed on the glass substrate, the coating having a first layer deposited over the glass substrate and a second layer, the second layer being provided between the first layer and the glass substrate, wherein the coated glass article exhibits a first emissivity; and (b) heating the coated glass article in an environment set to a predetermined temperature and for a predetermined period of time, wherein, after step (b), the coated glass article exhibits a second emissivity, the second emissivity being less than the first emissivity.

18 . The method according to claim 17 , wherein the coating is formed on a first major surface of the glass substrate and wherein a second major surface of the glass substrate and an opposite side of the coated glass article is uncoated.

19 . The method according to claim 17 , wherein the coating further comprises an iridescence-suppressing interlayer provided between the second layer and the glass substrate.

20 . The method according to claim 17 , wherein the coating is pyrolytic.

21 . The method according to claim 17 , wherein the coating is formed in conjunction with the manufacture of the glass substrate.

22 . The method according to claim 17 , wherein the glass substrate is formed utilizing a float glass manufacturing process.

23 . The method according to claim 17 , wherein at least one layer of the coating is deposited on the glass substrate by atmospheric pressure chemical vapor deposition (APCVD).

24 . The method according to claim 17 , wherein the first layer comprises silicon dioxide (SiO 2 ) or another suitable oxide of silicon.

25 . The method according to claim 17 , wherein the thickness of the first layer is 40-70 nm.

26 . The method according to claim 17 , wherein the second layer comprises a transparent conductive metal oxide.

27 . The method according to claim 17 , wherein the second layer comprises fluorine doped tin oxide (SnO 2 :F).

28 . The method according to claim 17 , wherein the second layer has a thickness of at least 250 nm, preferably at least 290 nm, even more preferably at least 300 nm, but at most 380 nm, more preferably at most 340 nm, even more preferably at most 330 nm.

29 . The method according to claim 17 , wherein after step (a) and before step (b) the coated glass article ( 10 ) is cooled to a temperature of less than 35° C., preferably cooled to a temperature of less than 30° C., more preferably cooled to a temperature of less than 25° C.

30 . The method according to claim 17 , wherein step (b) is carried out in an environment set to a predetermined temperature of 550-675° C., preferably 550-650° C., more preferably 575-650° C., most preferably 600-650° C.

31 . The method according to claim 17 , wherein the predetermined period of time for heating the coated glass article is 3-8 minutes.

32 . The method according to claim 17 , wherein the predetermined period of time for heating the coated glass article is 4-6 minutes.

33 . The method according to claim 17 , wherein after step (b) the article is laminated to a second glass article to form a laminated glass article, and the laminated glass article is bent by way of a shaping process.

34 . The method according to claim 17 , wherein after step (b) the article is laminated to a second coated glass article to form a laminated glass article, and the laminated glass article is bent by way of a shaping process.

35 . The method according to claim 17 , wherein the coated glass article ( 10 ) is utilized in a window for a vehicle.

36 . The method according to claim 17 , wherein the first major surface of the glass substrate and the coating face into the passenger cabin of the vehicle.

Assignees

• Pilkington Group Ltd

Inventors

• Varanasi Srikanth
• Strickler David Alan
• Ranjan Vikash

Classifications

• C03C1/04

  Opacifiers, e.g. fluorides or phosphates; Pigments · CPC title

• C03C2217/94

  Transparent conductive oxide layers [TCO] being part of a multilayer coating · CPC title

• C03C2218/1525

  by atmospheric CVD · CPC title

• C03C17/3417 Primary

  all coatings being oxide coatings · CPC title

• C03C2217/213

  SiO2 · CPC title