Toughenable glass article with negative relative thermal length change potential

Patent metadata

Field	Value
Publication number	US-12497327-B2
Application number	US-202217715663-A
Country	US
Kind code	B2
Filing date	Apr 7, 2022
Priority date	Apr 7, 2021
Publication date	Dec 16, 2025
Grant date	Dec 16, 2025

Abstract

A toughenable glass article includes a glass and has a thickness of less than 100 μm and a cooling state which is such that, after chemical toughening to a depth of 30% of the thickness, the glass article has a relative thermal length change potential in a range from −1500 ppm to ≤0 ppm.

First claim

What is claimed is:

1 . A toughenable glass article comprising a glass and having a thickness of less than 100 μm and a cooling state which is such that, after chemical toughening to a characteristic penetration depth (x c ) of 30% of the thickness, the glass article has a relative thermal length change potential in a range from −1500 ppm to ≤0 ppm.

2 . The toughenable glass article of claim 1 , wherein the thickness is in a range from 15 μm to 70 μm.

3 . The toughenable glass article of claim 1 , wherein the glass article has at least one fire-polished surface.

4 . The toughenable glass article of claim 1 , wherein the glass article has a surface roughness RMS of at most 5 nm.

5 . The toughenable glass article of claim 1 , wherein the glass article is not toughened.

6 . The toughenable glass article of claim 1 , wherein the glass article has a threshold diffusivity of at least 10 μm 2 per hour.

7 . The toughenable glass article of claim 1 , wherein the glass of the glass article is selected from the group consisting of aluminosilicate glass, boroaluminosilicate glass, silicate glass and borosilicate glass and wherein the glass comprises Na 2 O in a proportion of at least 9 wt. %.

8 . The toughenable glass article of claim 1 , wherein a rate of change of the relative thermal length change potential as a function of characteristic penetration depth (x c ) lies in a range from 30 ppm per μm x c to 1000 ppm per μm x c .

9 . The toughenable glass article of claim 1 , wherein a surface compressive stress (CS) after chemical toughening to the characteristic penetration depth (x c ) of 30% of the article thickness lies in a range from 600 MPa to 1000 MPa.

10 . The toughenable glass article of claim 1 , wherein a rate of change of the relative thermal length change potential as a function of a relative penetration depth is in a range from 20 ppm per % of the thickness of the glass article to 100 ppm per % of the thickness of the glass article.

11 . The toughenable glass article of claim 1 , wherein the glass has the following components:

(Wt.-%)

SiO 2
40-75 

Al 2 O 3
10-30 

B 2 O 3
0-20

Na 2 O + K 2 O
>0-30 

MgO + CaO + SrO + BaO + ZnO
0-25

TiO 2 + ZrO 2
0-15

P 2 O 5
 0-10.

12 . The toughenable glass article of claim 1 , wherein the toughenable glass article has a rate of change of the relative thermal length change potential as a function of characteristic penetration depth (x c ) in a range from 30 ppm per μm x c to 1000 ppm per μm x c and a threshold diffusivity (D) of at least 10 μm 2 per hour, wherein the glass is selected from the group consisting of aluminosilicate glass, boroaluminosilicate glass, silicate glass and borosilicate glass and wherein the glass comprises Na 2 O in a proportion of at least 9 wt. %.

13 . The toughenable glass article of claim 1 , wherein a roughness depth (R 1 ) of the glass article is at most 6 nm.

14 . A toughenable glass article, comprising a glass and having a rate of change of a relative thermal length change potential as a function of characteristic penetration depth (x c ) in a range from 30 ppm per μm x c to 1000 ppm per μm x c .

15 . The toughenable glass article of claim 14 , wherein the glass article has a thickness in a range from 15 μm to 70 μm.

16 . The toughenable glass article of claim 14 , wherein the glass article has at least one fire-polished surface.

17 . The toughenable glass article of claim 14 , wherein the glass article has a surface roughness RMS of at most 5 nm.

18 . The toughenable glass article of claim 14 , wherein the glass article is not toughened.

19 . The toughenable glass article of claim 14 , wherein the glass article has a threshold diffusivity of at least 10 μm 2 per hour.

20 . The toughenable glass article of claim 14 , wherein the glass is selected from the group consisting of aluminosilicate glass, boroaluminosilicate glass, silicate glass and borosilicate glass and wherein the glass comprises Na 2 O in a proportion of at least 9 wt. %.

Assignees

• Schott Ag

Inventors

• Langsdorf Andreas
• Heiss Markus
• Glässer Vanessa

Classifications

• C03C3/087

  containing calcium oxide, e.g. common sheet or container glass · CPC title

• C03C3/083

  containing aluminium oxide or an iron compound · CPC title

• C03C3/078

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

• C03B29/00

  Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins · CPC title

• C03C3/097 Primary

  containing phosphorus, niobium or tantalum · CPC title