Glass with high frictive damage resistance

Patent metadata

Field	Value
Publication number	US-10155689-B2
Application number	US-201615134569-A
Country	US
Kind code	B2
Filing date	Apr 21, 2016
Priority date	May 5, 2011
Publication date	Dec 18, 2018
Grant date	Dec 18, 2018

Abstract

A glass article exhibiting improved resistance to frictive surface damage and a method for making it, the method comprising removing a layer of glass from at least a portion of a surface of the article that is of a layer thickness at least effective to reduce the number and/or depth of flaws on the surface of the article, and then applying a friction-reducing coating to the portion of the article from which the layer of surface glass has been removed.

First claim

What is claimed is:

1. A glass article comprising:
a. a glass substrate comprising at least one surface portion having a surface compressive stress and a chemically etched surface, wherein the chemically etched surface is free of surface flaws of a depth exceeding 2 μm; and
b. a friction-reducing coating disposed on the etched surface, wherein the friction reducing coating is a coating selected from the group consisting of (a) coatings comprising an amphiphobic fluorine-based surface layer chemically bonded to the surface of the glass substrate; (b) hydrophobic coatings deposited from heat-vaporized aqueous surface solutions; (c) covalently bonded coatings comprising at least one organic species selected from the group of silanes, siloxanes, silanols, and cationic phosphonium compounds; (d) self-assembled monolayer coatings comprising hydrocarbon-functional or fluorocarbon-functional silane monomers or oligomers; and (e) organic polymeric coatings bonded to the chemically etched surface via van der Waal forces, wherein the organic polymeric coatings comprise at least one of acrylate polymer, polyvinyl alcohol and ethylenebissteramide;
wherein the glass article suffers no frictive damage following sliding surface contact by a 2 mm ball point stylus under a 20 kilogram load.

2. The glass article in accordance with claim 1 wherein the friction-reducing coating comprises an amphiphobic fluorine-based surface layer chemically bonded to the surface of the glass substrate.

3. The glass article in accordance with claim 2 wherein the fluorine-based surface layer is selected from the group consisting of:
a. silica —OH group-terminated active surface sites exchanged with a fluorine-based monomer;
b. an assembled monolayer of a fluorine-terminating molecular chain;
c. a thin, fluoro-polymeric coating;
d. a silicon compound of general formula (RF)nSiX4−n, where RF is a perfluorocarbon moiety, X is selected from the group consisting of a non-fluorine halogen and a C2-C6 alkoxy group, and n is in the range of 1-3; and
e. silica soot particles derived from or treated to incorporate fluorine termination groups.

4. The glass article in accordance with claim 1 wherein the glass substrate comprises an alkali aluminosilicate glass sheet.

5. The glass article in accordance with claim 4 wherein the surface compressive stress is at least about 200 MPa and has surface compressive layer depth in the range of 20-80 μm.

6. The glass article in accordance with claim 5 wherein the surface compressive stress is at least about 600 MPa.

7. The glass article in accordance with claim 6 wherein the surface compressive layer depth is at least 40 μm, and wherein the glass sheet has a thickness in the range of 0.7−1.1 mm.

8. The glass article in accordance with claim 1 wherein the glass article has a kinetic coefficient of friction less than or equal to 0.05.

Assignees

• Corning Inc

Inventors

• Gross Timothy Michael

Classifications

• Y10T428/31544

  Addition polymer is perhalogenated · CPC title

• C03C2218/31

  Pre-treatment · 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

• C03C17/28 Primary

  with organic material (C03C17/34, C03C17/44 take precedence) · CPC title