Asymmetrically structured thin glass sheet that is chemically strengthened on both surface sides, method for its manufacture as well as use of same

Patent metadata

Field	Value
Publication number	US-2017015584-A1
Application number	US-201615208942-A
Country	US
Kind code	A1
Filing date	Jul 13, 2016
Priority date	Jul 13, 2015
Publication date	Jan 19, 2017
Grant date	—

Abstract

A thin glass sheet includes a first and a second surface side, wherein the thin glass sheet is asymmetrically structured in that the two surface sides differ from one another, wherein both surface sides are chemically strengthened and wherein respectively a depth of layer exists of the alkali ions that are introduced through chemical strengthening, whereby the depth of layer of the first surface side (DoL 1 ) and the depth of layer of the second surface side (DoL 2 ) are coordinated with each other in such a way that they are equal or are adapted on both surface sides, and that on both surface sides respectively a coating consisting of one or several layers is provided, wherein the coating on the first surface side differs from the coating on the second surface side in at least one property or characteristic.

First claim

What is claimed is:

1 . A thin glass sheet, comprising:
a first surface side which is chemically strengthened, said first surface side having a first depth of layer of alkali ions (DoL 1 ) introduced through chemical strengthening; at least one layer of a first coating provided on said first surface side; a second surface side differing from said first surface side in at least one property or characteristic and which is chemically strengthened, said second surface side having a second depth of layer of alkali ions (DoL 2 ) introduced through chemical strengthening, said DoL 2 and said DoL 1 being coordinated with each other in such a way that DoL 2 and DoL 1 are equal or are adapted on both surface sides; and at least one layer of a second coating provided on said second surface side, said second coating differing from said first coating in at least one property or characteristic.

2 . The thin glass sheet according to claim 1 , wherein said at least one differing property or characteristic between said first coating and said second coating is at least one of a thickness, a porosity, a number of coating layers, a structure, a composition of layer(s), and a manufacturing process of the layer(s).

3 . The thin glass sheet according to claim 1 , further comprising at least one layer of tin atoms diffused into said second surface.

4 . The thin glass sheet according to claim 1 , wherein said thin glass sheet comprises at least one of a silicate glass, a soda-lime-silica glass, a crown glass, and a borosilicate glass and said DoL 1 and said DoL 2 are adapted such that a difference between said DoL 1 and said DoL 2 (ΔDoL) is less than or equal to 15% of the lesser depth of layer.

5 . The thin glass sheet according to claim 4 , wherein said ΔDoL is less than or equal to 5% of the lesser depth of layer.

6 . The thin glass sheet according to claim 1 , wherein said thin glass sheet comprises an alumino-silicate glass and said DoL 1 and said DoL 2 are adapted such that a difference between said DoL 1 and said DoL 2 (ΔDoL) is less than or equal to 10% of the lesser depth of layer.

7 . The thin glass sheet according to claim 6 , wherein said ΔDoL is less than or equal to 3.5% of the lesser depth of layer.

8 . The thin glass sheet according to claim 1 , wherein said DoL 1 and said DoL 2 are adapted to one another such that said thin glass sheet has a maximum deviation from flatness of less than 300 μm.

9 . The thin glass sheet according to claim 1 , wherein said thin glass sheet has a thickness of less than 3 mm.

10 . The thin glass sheet according to claim 1 , wherein said thin glass sheet is a silicate glass having a composition comprising, in weight-%:

SiO 2
10-90; 

AI 2 O 3
0-40;

B 2 O 3
0-80;

Na 2 O
1-30;

K 2 O
0-30;

CoO
0-20;

NiO
0-20;

Ni 2 O 3
0-20;

MnO
0-20;

CaO
0-40;

BaO
0-60;

ZnO
0-40;

ZrO 2
0-10;

MnO 2
0-10;

CeO
0-3; 

SnO 2
0-2; 

Sb 2 O 3
0-2; 

TiO 2
0-40;

P 2 O 5
0-70;

MgO
0-40;

SrO
0-60;

Li 2 O
0-30;

Li 2 O + Na 2 O + K 2 O
1-30;

SiO 2 + B 2 O 3 + P 2 O 5
10-90; 

Nd 2 O 5
0-20;

V 2 O 5
0-50;

Bi 2 O 3
0-50;

SO 3
      0-50; and

SnO
0-70,

wherein a content of SiO 2 +P 2 O 5 +B 2 O 3 is 10-90 weight-%.

11 . The thin glass sheet according to claim 10 , wherein said silicate glass is a soda-lime-silica glass having a composition comprising, in weight-%:

SiO 2
40-80;

Al 2 O 3
0-6;

B 2 O 3
0-5;

Sum Li 2 O + Na 2 O + K 2 O
 5-30;

Sum MgO + CaO + SrO + BaO + ZnO
 3-30;

Sum TiO 2 + ZrO 2
      0-7; and

P 2 O 5
0-2.

Assignees

• Schott Ag

Inventors

• Krzyzak Marta
• Apitz Dirk
• Brueckner Matthias
• Joerdens Thomas
• Walther Marten

Classifications

• C03C17/00

  Surface treatment of glass, not in the form of fibres or filaments, by coating (optical coatings of optical elements G02B1/10) · CPC title

• C03C17/23

  Oxides (C03C17/02 takes precedence) · CPC title

• C03C21/002 Primary

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

• C03C2217/73

  Anti-reflective coatings with specific characteristics · CPC title

• C03C3/064

  containing boron · CPC title