IP Library › Granted Patent US 12,291,008
Granted Patent B2
US 12,291,008 · App. 17/677,685 · Granted May 6, 2025

Burn-off protective coating

Inventors: Farzad Fareed (Gibsonia, PA); Adam D. Polcyn (Pittsburgh, PA); Erin A. Casci (Pittsburgh, PA)
Assignee: Vitro Flat Glass LLC
B32B27/06B32B43/006C03C17/32B32B2255/26C03C2217/78C03C2218/11C03C2218/328Y10T428/19
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Quick Facts
Patent No.
US 12,291,008
App. No.
17/677,685
Granted
May 6, 2025
Kind
B2
Abstract

A protected substrate includes a planar substrate having a surface and a burn-off temporary protective layer positioned over at least a portion of the surface. The burn-off temporary protective layer includes a wax, a polyolefin, a polyester, a polycarbonate, a polyether, or some combination thereof. The burn-off temporary protective layer is removable by a heat treatment process that does not substantially damage the surface. Various other protected substrates and methods for protecting a substrate are also disclosed.

Claims (25)

1. A protected glass substrate, comprising:

a planar glass substrate comprising a surface; and

a burn-off temporary protective layer positioned over at least a portion of the glass surface,

wherein the burn-off temporary protective layer comprises a polylactic acid, a polypropylene carbonate, a polycaprolactone, an amorphous polypropylene, an isotactic polypropylene, a stearic acid-containing wax, a paraffin wax, a carnauba wax, a microcrystalline wax, a polyethylene wax, a polyamide emulsion, or some combination thereof, and

wherein the burn-off temporary protective layer is removable by a heat treatment process that does not substantially damage the glass surface or leave behind any substantial residue.

2. The protected glass substrate of claim 1 , wherein at least one protective layer is present over at least a portion of the burn-off temporary protective layer and the at least one protective layer is formed from a polyethylene, polypropylene, polyester, polyethylene terephthalate, nylon, polyvinyl chloride, vinyl, polylactic acid, polyoxymethylene, or some combination thereof.

3. The protected glass substrate of claim 1 , wherein the burn-off temporary protective layer comprises a thickness of at least 10 nm and at most 5,000 μm.

4. The protected glass substrate of claim 1 , wherein the protected substrate does not include a temporary protective sheet positioned over the glass surface.

5. The protected glass substrate of claim 1 , wherein the burn-off temporary protective layer is an outermost layer of the planar glass substrate.

6. The protected glass substrate of claim 1 , wherein the burn-off temporary protective layer is positioned over the entire glass surface and at least a portion of an edge of the glass substrate.

7. The protected glass substrate of claim 1 , wherein the burn-off temporary protective layer is removable by burning at a temperature of at most 1000° C.

8. The protected glass substrate of claim 1 , wherein the heat treatment process does not cause the glass surface to have a color change (DECMC) of more than 3 units compared to a color of the glass surface before the heat treatment process.

9. The protected glass substrate of claim 1 , further comprising a functional coating positioned between the glass surface and the burn-off temporary protective layer.

10. The protected glass substrate of claim 9 , wherein the functional coating comprises a low-E coating layer.

11. The protected glass substrate of claim 1 , wherein the burn-off temporary protective layer comprises a material having a melting point of at least 60° C. and at most 350° C.

12. The protected glass substrate of claim 1 , wherein the burn-off temporary protective layer comprises a solvent.

13. A method for protecting a glass substrate, comprising:

providing a protected substrate according to claim 1 , wherein the burn-off temporary protective layer is removable by a heat treatment process that does not substantially damage the glass surface or leave behind any substantial residue.

14. The method of claim 13 , wherein at least one protective layer is present over at least a portion of the burn-off temporary protective layer and the at least one protective layer is formed from a polyethylene, polypropylene, polyester, polyethylene terephthalate, nylon, polyvinyl chloride, vinyl, polylactic acid, polyoxymethylene, or some combination thereof.

15. The method of claim 13 , further comprising:

forming the burn-off temporary protective layer by curtain coating.

16. A method of removing a burn-off temporary protective layer from a coated glass substrate, comprising:

providing a protected substrate according to claim 1 ; and

removing the burn-off temporary protective layer from the surface by burning the burn-off temporary protective layer to form an unprotected substrate without substantially damaging the glass surface or leave behind any substantial residue.

17. The method of claim 16 , wherein at least one protective layer is present over at least a portion of the burn-off temporary protective layer and the at least one protective layer is formed from a polyethylene, polypropylene, polyester, polyethylene terephthalate, nylon, polyvinyl chloride, vinyl, polylactic acid, polyoxymethylene, or some combination thereof.

Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Feb 27, 2023
From: FAREED, FARZAD
To: VITRO FLAT GLASS LLC
Reel/Frame 062805/0943 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Feb 22, 2022
From: FAREED, FARZAD; POLCYN, ADAM D.; CASCI, ERIN A.
To: VITRO FLAT GLASS LLC
Reel/Frame 059068/0733 →
Continuity (3)
Continuation 16456230 · Jun 28, 2019
Provisional Application 62691814 · Jun 29, 2018
Related Publication 20220176683A1 · Jun 9, 2022
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