USRE49530EActiveUtilityPatentIndex 62
Crack and scratch resistant glass and enclosures made therefrom
Est. expiryAug 21, 2029(~3.1 yrs left)· nominal 20-yr term from priority
Y10T225/12Y10T428/315C03B 33/0222C03C 3/091Y02P40/57C03C 21/002C03C 21/00Y10T428/24777C03B 33/04C03C 3/097C03B 33/091
62
PatentIndex Score
0
Cited by
169
References
33
Claims
Abstract
A glass and an enclosure, including windows, cover plates, and substrates for mobile electronic devices comprising the glass. The glass has a crack initiation threshold that is sufficient to withstand direct impact, has a retained strength following abrasion that is greater than soda lime and alkali aluminosilicate glasses, and is resistant to damage when scratched. The enclosure includes cover plates, windows, screens, and casings for mobile electronic devices and information terminal devices.
Claims
exact text as granted — not AI-modifiedThe invention claimed is:
1. A glass comprising:
at least 58 mol % SiO 2 ; at least 8 mol % Na 2 O; 5.5-12 mol % B 2 O 3 ; and Al 2 O 3 ; wherein a ratio
Al
2
O
3
(
mol
%
)
+
B
2
O
3
(
mol
%
)
∑
modifiers
(
mol
%
)
>
1
,
the modifiers are one or more alkali metal oxide (R 2 O) and one or more alkaline earth oxide (RO);
wherein Al 2 O 3 (mol %)>B 2 O 3 (mol %) and 0.9<R 2 O/Al 2 O 3 <1.3, wherein the glass is substantially free of Li 2 O.
2. The glass of claim 1 , wherein the glass is ion exchanged and has a layer under a compressive stress of at least about 600 MPa, the layer extending from a surface of the glass into the glass to a depth of layer of at least about 30 μm.
3. The glass of claim 2 , wherein the compressive stress is at least about 800 MPa.
4. The glass of claim 2 , wherein the glass has a Vickers crack initiation threshold of at least about 30 kgf.
5. The glass of claim 1 , wherein the glass is defined by the equation
Al
2
O
3
(
mol
%
)
+
B
2
O
3
(
mol
%
)
∑
modifiers
(
mol
%
)
≥
1.45
.
6. The glass of claim 1 , wherein the glass comprises from about 60 to 72 mol % SiO 2 , about 9 mol % to about 17 mol % Al 2 O 3 , and about 8 mol % to about 20 mol % Na 2 O.
7. The glass of claim 1 , wherein the glass comprises at least one of MgO, ZnO, CaO, SrO, and BaO.
8. The glass of claim 1 , wherein the glass comprises 5.5-10 mol % B 2 O 3 .
9. The glass of claim 1 , wherein the glass comprises from 0 mol % to about 4 mol % K 2 O.
10. The glass of claim 1 , wherein the glass is defined by the following equation −5.7 mol %<Σ modifiers−Al 2 O 3 <2.99 mol %.
11. The glass of claim 1 , wherein the glass is defined by the following equation 1.0<R 2 O/Al 2 O 3 <1.3.
12. The glass of claim 1 , wherein the glass has a Young's modulus of less than about 69 GPa.
13. A glass comprising:
at least 58 mol % SiO 2 ; at least 8 mol % Na 2 O; 2-12 mol % B 2 O 3 ; and Al 2 O 3 ;
wherein a ratio
Al
2
O
3
(
mol
%
)
+
B
2
O
3
(
mol
%
)
∑
modifiers
(
mol
%
)
>
1
,
the modifiers are one or more alkali metal oxide (R 2 O) and one or more alkaline earth oxide (RO);
wherein 0.9<R 2 O/Al 2 O3<1.3, Al 2 O 3 (mol %)>B 2 O 3 (mol %), and wherein the glass is defined by the following equation −5.7 mol %<Σ modifiers−Al 2 O 3 <2.17 mol %.
14. The glass of claim 13 , wherein the glass is defined by the equation
Al
2
O
3
(
mol
%
)
+
B
2
O
3
(
mol
%
)
∑
modifiers
(
mol
%
)
≥
1.45
.
15. The glass of claim 13 , wherein the glass comprises from about 60 to 72 mol % SiO 2 , about 9 mol % to about 17 mol % Al 2 O 3 , and about 8 mol % to about 20 mol % Na 2 O.
16. The glass of claim 13 , wherein the glass comprises at least one of MgO, ZnO, CaO, SrO, and BaO.
17. The glass of claim 13 , wherein the glass comprises 3-10 mol % B 2 O 3 .
18. The glass of claim 13 , wherein the glass is defined by the following equation 1.0<R 2 O/Al 2 O 3 <1.3.
19. The glass of claim 13 , wherein the glass has a Young's modulus of less than about 69 GPa.
20. A glass comprising:
at least 58 mol % SiO 2 ; at least 8 mol % Na 2 O; 2-10 mol % B 2 O 3 ; Al 2 O 3 ; and wherein a ratio
Al
2
O
3
(
mol
%
)
+
B
2
O
3
(
mol
%
)
∑
modifiers
(
mol
%
)
>
1
,
the modifiers are one or more alkali metal oxide (R 2 O) and one or more alkaline earth oxide (RO);
wherein 0.9<R 2 O/Al 2 O 3 <1.3, and wherein the glass is defined by the following equation −5.7 mol %<Σ modifiers−Al 2 O 3 <2.17 mol %.
21. The glass of claim 20 , wherein the glass is defined by the equation
Al
2
O
3
(
mol
%
)
+
B
2
O
3
(
mol
%
)
∑
modifiers
(
mol
%
)
≥
1.45
.
22. The glass of claim 20 , wherein the glass comprises from about 60 to 72 mol % SiO 2 , about 9 mol % to about 17 mol % Al 2 O 3 , and about 8 mol % to about 20 mol % Na 2 O.
23. The glass of claim 20 , wherein the glass comprises at least one of MgO, ZnO, CaO, SrO, and BaO.
24. The glass of claim 20 , wherein the glass comprises 3-10 mol % B 2 O 3 .
25. The glass of claim 20 , wherein the glass is defined by the following equation 1.0<R 2 O/Al 2 O 3 <1.3.
26. An aluminoborosilicate glass comprising:
at least 58 mol % SiO 2 ; 9-17 mol % Al 2 O 3 ; 2-12 mol % B 2 O 3 ; 8-16 mol % Na 2 O; >0-2 mol % SnO 2 ; and 0 mol % P 2 O 5 , wherein
Al
2
O
3
(
mol
%
)
+
B
2
O
3
(
mol
%
)
Σ
modifiers
(
mol
%
)
>
1
,
wherein the modifiers are one or more alkali metal oxide (R 2 O) and one or more alkaline earth metal oxide (RO),
wherein Al 2 O 3 (mol %)>B 2 O 3 (mol %),
wherein 1<R 2 O (mol %)/Al 2 O 3 (mol %)<1.3,
wherein the glass has a Vickers crack initiation threshold of greater than 500 gf, and
wherein the glass is substantially free of lithium.
27. The glass of claim 26, wherein the glass comprises from 60 to 72 mol % SiO 2 .
28. The glass of claim 26, wherein the glass is defined by the equation wherein B 2 O 3 (mol %)>(R 2 O (mol %)−Al 2 O 3 (mol %)).
29. The glass of claim 26, wherein the glass is defined by the equation
1
<
Al
2
O
3
(
mol
%
)
+
B
2
O
3
(
mol
%
)
Σ
modifiers
(
mol
%
)
<
1.45
.
30. The glass of claim 26, wherein the glass has a molar volume of at least 27 cm 3 /mol.
31. The glass of claim 26, wherein the glass is free of at least one of arsenic, antimony, and barium.
32. The glass of claim 26, wherein the glass has a Vickers crack initiation threshold of at least 1000 gf.
33. The glass of claim 26, wherein the glass, when ion exchanged, has a Vickers crack initiation threshold of at least 30 kgf.Cited by (0)
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