Textured glass articles and methods of making the same

Patent metadata

Field	Value
Publication number	US-2018282201-A1
Application number	US-201815915325-A
Country	US
Kind code	A1
Filing date	Mar 8, 2018
Priority date	Mar 28, 2017
Publication date	Oct 4, 2018
Grant date	—

Abstract

A textured glass article that includes: a glass substrate comprising a thickness, a primary surface and a bulk composition at the midpoint of the thickness; and a textured region defined by the primary surface and comprising a textured region composition. The textured region comprises a sparkle of 2% or less. Further, the bulk composition comprises about 40 mol % to 80 mol % silica and the textured region composition comprises at least about 40 mol % silica.

First claim

What is claimed is:

1 . A textured glass article, comprising:
a glass substrate comprising a thickness, a primary surface and a bulk composition at the midpoint of the thickness; and a textured region defined by the primary surface and comprising a textured region composition, wherein the textured region comprises a sparkle of 2% or less, and further wherein the bulk composition comprises about 40 mol % to 80 mol % silica and the textured region composition comprises at least about 40 mol % silica.

2 . The article according to claim 1 , wherein the textured region further comprises a surface roughness (R a ) from about 10 nanometers to about 500 nanometers.

3 . The article according to claim 1 , wherein the bulk composition is selected from the group consisting of an aluminosilicate glass, a borosilicate glass, and a phosphosilicate glass.

4 . The article according to claim 1 , wherein the textured region composition and the bulk composition each comprise a substantially equivalent amount of silica.

5 . The article according to claim 1 , wherein the textured region composition comprises a higher amount of silica than the silica in the bulk composition.

6 . The article according to claim 1 , wherein the glass substrate further comprises a compressive stress region that extends from the primary surface to a selected depth.

7 . The article according to claim 6 , further comprising an easy-to-clean (ETC) coating disposed over the textured region, the ETC coating comprising a fluorosilane.

8 . The article according to claim 1 , wherein the article is characterized by a haze from greater than 0% to 100%.

9 . A consumer electronic product, comprising:
a housing having a front surface, a back surface and side surfaces; electrical components provided at least partially within the housing, the electrical components including at least a controller, a memory, and a display, the display being provided at or adjacent the front surface of the housing; and a cover glass disposed over the display, wherein at least one of a portion of the housing or the cover glass comprises the article of claim 1 .

10 . A textured glass article, comprising:
a glass substrate comprising a thickness, a primary surface and a bulk composition at the midpoint of the thickness; and a textured region defined by the primary surface and comprising a textured region composition, wherein the textured region comprises a sparkle of 2% or less and a plurality of exposed features having an average maximum dimension of less than 5 microns in a plane defined by the primary surface, and further wherein the bulk composition comprises about 40 mol % to 80 mol % silica and the textured region composition comprises at least about 40% silica.

11 . The article according to claim 10 , wherein the textured region further comprises a surface roughness (R a ) from about 10 nanometers to about 500 nanometers.

12 . The article according to claim 10 , wherein the bulk composition is selected from the group consisting of an aluminosilicate glass, a borosilicate glass, and a phosphosilicate glass.

13 . The article according to claim 10 , wherein the textured region composition and the bulk composition each comprise a substantially equivalent amount of silica.

14 . The article according to claim 10 , wherein the textured region composition comprises a higher amount of silica than the silica in the bulk composition.

15 . The article according to claim 10 , wherein the glass substrate further comprises a compressive stress region that extends from the primary surface to a selected depth.

16 . The article according to claim 15 , further comprising an easy-to-clean (ETC) coating disposed over the textured region, the ETC coating comprising a fluorosilane.

17 . The article according to claim 16 , wherein the article is characterized by a haze from greater than 0% to 100%.

18 . A consumer electronic product, comprising:
a housing having a front surface, a back surface and side surfaces; electrical components provided at least partially within the housing, the electrical components including at least a controller, a memory, and a display, the display being provided at or adjacent the front surface of the housing; and a cover glass disposed over the display, wherein at least one of a portion of the housing or the cover glass comprises the article of claim 15 .

19 . A method of making a textured glass article, comprising:
etching an initial primary surface of a glass substrate having a thickness with a hydrofluoric acid-free etchant having a pH of about 3 or less; and removing the etchant from the glass substrate, wherein the etching is conducted from above ambient temperature to about 100° C. to form a textured region that is defined by a primary surface of the substrate and comprises a sparkle of 2% or less, and further wherein the glass substrate comprises a bulk composition at the midpoint of the thickness comprising about 40 mol % to 80 mol % silica and the textured region comprises a textured region composition comprising at least about 40 mol % silica.

20 . The method according to claim 19 , wherein the textured region composition comprises a higher amount of silica than the silica in the bulk composition.

21 . The method according to claim 20 , wherein the etching step comprises etching the initial primary surface of the glass substrate having a thickness with a hydrofluoric acid-free etchant having a pH of about 3 or less and an additive salt.

22 . The method according to claim 21 , wherein the additive salt comprises one or more cations selected from the group consisting of NH 4 + , Al 3+ , Fe 3+ , Ca 2+ and Mg 2+ .

23 . The method according to claim 21 , wherein the etching step is conducted such that the temperature is from about 90° C. to about 110° C. and the concentration of the additive salt ranges from greater than 0.1M to about 1.5M.

24 . The method according to claim 20 , further comprising:
treating the textured region with a second etchant having a pH of about 10.0 or greater to remove the textured region and form a second leached region that comprises a second textured region composition and is defined by a primary surface of the substrate, wherein the treating is conducted above ambient temperature.

25 . The method according to claim 24 , wherein the second textured region composition and the bulk composition each comprise a substantially equivalent amount of silica.

Assignees

• Corning Inc

Inventors

• Hancock Jr Robert Randall
• Hughes Kelleen Kaye
• Jin Yuhui
• Li Aize

Classifications

• C03C21/002

  to perform ion-exchange between alkali ions (C03C21/005 takes precedence) · CPC title

• C03C17/30 Primary

  with silicon-containing compounds · CPC title

• C03C15/00

  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

• C03C3/093 Primary

  containing zinc or zirconium · CPC title

• C03C3/091

  containing aluminium · CPC title