Appliance transparency

• US 8,728,634 B2
• Filed: 06/06/2008
• Issued: 05/20/2014
• Est. Priority Date: 06/13/2007
• Status: Active Grant

• Current Assignee: Vitro Flat Glass LLC (Compagnie De Saint-Gobain)
• Original Assignee: PPG Industries Ohio Incorporated (Nouryon BV)
• Inventors: Medwick, Paul A., Thiel, James P., Wagner, Andrew V.
• Primary Examiner(s): Sample, David
• Assistant Examiner(s): COLGAN, LAUREN ROBINSON
• Application Number:
  US12/134,262
• Publication Number:
  US 20090142602A1
• Time in Patent Office: 2,174 Days
• Field of Search: 428/432, 428/544, 428/426, 428/428, 428/446, 428/699, 428/701, 428/702
• US Class Current: 428/701
• CPC Class Codes: C03C 17/36 at least one coating being a metal
• CPC Class Codes: C03C 17/3613 Coatings of type glass/inorganic compound/metal/inorganic compound/metal/other
• CPC Class Codes: C03C 17/3639 Multilayers containing at least two functional metal layers
• CPC Class Codes: C03C 17/3642 the multilayer coating containing a metal layer
• CPC Class Codes: C03C 17/3644 the metal being silver
• CPC Class Codes: C03C 17/3649 made of metals other than silver
• CPC Class Codes: C03C 17/3657 the multilayer coating having optical properties
• CPC Class Codes: C03C 17/3686 the multilayer coating being used for ovens
• CPC Class Codes: C03C 17/3694 one layer having a composition gradient through its thickness
• CPC Class Codes: C03C 2218/365 Coating different sides of a glass substrate

Abstract

A transparency includes a substrate having a first major surface and a second major surface. A first coating is provided over at least a portion of the first major surface, the first coating including one or more metal oxide layers. A second coating is provided over at least a portion of the second major surface, the second coating including one or more metallic layers.

Claims

1. An oven transparency, comprising:

a plurality of uncoated glass substrates;

a single coated glass substrate having a first major surface and a second major surface;

a first coating having a thickness in the range of 4,000 Å

to 5,000 Å

provided over at least a portion of the first major surface of the coated glass substrate, the first coating comprising;

a first coating layer comprising a gradient layer comprising silica and tin oxide having a thickness in the range of 1,000 Å

to 1,200 Å

, where said gradient layer has a continuously changing composition as distance increases from an interface of said gradient layer and said single coated glass substrate; and

a second coating layer comprising fluorine doped tin oxide having a thickness in the range of 3,000 Å

to 4,000 Å

; and

a second coating provided over at least a portion of the second major surface, of the coated glass substrate the second coating comprising;

a first dielectric layer having a thickness less than or equal to 500 Å

comprising a zinc stannate layer and a zinc oxide layer;

a first metallic layer having a thickness in the range of 70 Å

to 110 Å

over the first dielectric layer;

a second dielectric layer having a thickness in the range of 500 Å

to 1,000 Å

over the first metallic layer and comprising a first zinc oxide layer, a zinc stannate layer, and a second zinc oxide layer;

a second metallic layer having a thickness in the range of 80 Å

to 200 Å

over the second dielectric layer; and

a topcoat over the second metallic layer consisting of a single layer comprising zinc oxide; and

a protective coating over the topcoat,

wherein the oven transparency has a transmitted color selected from blue and greenish blue,

wherein said first coating defines a first side of said coated glass substrate, and said second coating defines a second side of said coated glass substrate,

wherein the first side has a reflected color defined by −

10 ≦

a*≦

0 and −

30 ≦

b*≦

−

5,

wherein the second side has a reflected color defined by −

10 ≦

a*≦

0 and −

30 ≦

b*−

5, and

wherein at least one of the first side and the second side has an L* greater than or equal to 40.

2. The oven transparency of claim 1, wherein the protective coating comprises 15 wt. % to 70 wt. % alumina and 85 wt. % to 30 wt. % silica.

3. The oven transparency of claim 1, wherein the protective coating comprises a first layer and a second layer formed over the first layer, wherein the first layer comprises 50 wt. % to 100 wt. % alumina and 50 wt. % to 0 wt. % silica, and the second layer comprises a mixture of silica and alumina.

4. The oven transparency of claim 1, wherein said topcoat has a thickness of from 40 Å

to 500 Å

.

5. The oven transparency of claim 1, wherein for the second dielectric layer the zinc stannate film is deposited over the first zinc oxide film, and the second zinc oxide film is deposited over the zinc stannate film.

6. The oven transparency of claim 1, wherein said second coating layer has a thickness in the range of 3,500 Å

to 4,000 Å

.