Glare-free glass articles and method for producing glare-free glass articles

Patent metadata

Field	Value
Publication number	US-11873244-B2
Application number	US-202117217982-A
Country	US
Kind code	B2
Filing date	Mar 30, 2021
Priority date	Mar 30, 2020
Publication date	Jan 16, 2024
Grant date	Jan 16, 2024

Abstract

Glare-free glass articles and methods for producing are provided. The glass article includes a surface with an area having a roughness RMS from 10 nm to 1000 nm, a distinctness of image DOI from 30 to 70, a gloss value of less than 40 at a viewing angle of 60°, and a haze value, determined in transmission, of less than 3%. The area also has a ratio of mean height of peaks above core surface (Spk) to mean depth of valleys below core surface (Svk) that is equal to 1±0.1 within a measured surface area of more than 0.1 mm2 and less than 3 mm2.

First claim

What is claimed is:

1. A sheet-like glass article, comprising:
a surface with an area having a roughness RMS from 10 nm to 1000 nm, a distinctness of image DOI from 30 to 70, a gloss value of less than 40 at a viewing angle of 60°, and a haze value, determined in transmission, of less than 3%; and
a ratio of mean height of peaks above core surface (Spk) to mean depth of valleys below core surface (Svk) determined for the area that is equal to 1±0.1 within a measured surface area of more than 0.1 mm 2 and less than 3 mm 2 .

2. The article of claim 1 , wherein the area further comprises a skewness value (Ssk) that is greater than 0 determined within the measured surface area.

3. The article of claim 1 , wherein the area further comprises a root mean square gradient value (Sdq) that is at least 50 μm/mm over a surface area of 0.33 mm*0.33 mm.

4. The article of claim 3 , wherein the root mean square gradient value (Sdq) is at least 75 μm/mm over the surface area of 0.33 mm*0.33 mm.

5. The article of claim 3 , wherein the root mean square gradient value (Sdq) is at least 70 μm/mm over an area of 1.6 mm*1.6 mm.

6. The article of claim 3 , wherein the root mean square gradient value (Sdq) is at least 100 μm/mm over an area of 1.6 mm*1.6 mm.

7. The article of claim 1 , wherein the area has a surface topography configured so that a skewness or asymmetry (Ssk) is greater than 0.

8. The article of claim 7 , wherein the skewness or asymmetry (Ssk) is more than 1.

9. The article of claim 1 , further comprising a sparkle, as determined for a display having 190 DPI, of less than 0.1.

10. The article of claim 9 , wherein the sparkle is at most 0.09.

11. The article of claim 1 , wherein the glass article is toughened.

12. The article of claim 1 , wherein the glass article is chemically toughened.

13. The article of claim 1 , further comprising a thickness between 0.1 mm and 8 mm.

14. The article of claim 1 , wherein the glass article comprises glass comprising, in wt %:
SiO 2 50 to 80,
Al 2 O 3 0 to 30,
B 2 O 3 0 to 20,
Li 2 O 0 to 15,
Na 2 O 0 to 20,
K 2 O 0 to 20,
CaO 0 to 15,
BaO 0 to 10.

Assignees

• Schott Ag

Inventors

• Hahn Andreas
• Gönüllü Yakup
• Rudigier-Voigt Eveline
• Damm Thorsten

Classifications

• C03C15/00 Primary

  Surface treatment of glass, not in the form of fibres or filaments, by etching (etching or surface-brightening compositions, in general C09K13/00) · CPC title

• C03C3/076

  with 40% to 90% silica, by weight {(C03C3/045 takes precedence)} · CPC title

• C03C3/078

  containing an oxide of a divalent metal, e.g. an oxide of zinc · CPC title

• C03C3/083

  containing aluminium oxide or an iron compound · CPC title

• C03C3/085

  containing an oxide of a divalent metal · CPC title