IP Library › Granted Patent US 6,992,031
Granted Patent B2
US 6,992,031 · App. 10/333,213 · Granted Jan 31, 2006

Method for producing aluminosilicate glass

Assignee: Schott Glas
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Quick Facts
Patent No.
US 6,992,031
App. No.
10/333,213
Granted
Jan 31, 2006
Kind
B2
Abstract

The invention relates to a method for producing aluminosilicate glass that is devoid of alkali and that has a B 2 O 3 content of between 0 and <5 wt.-% and a BaO content in excess of 5.5 wt.-%. Said method is characterised by the addition of between 0.05 wt.-% and 1.0 wt.-% SnO 2 during the preparation of the mixture.

Claims (324)

1. A process for producing an alkali-free aluminosilicate glass comprising charging an alkali-free aluminosilicate glass batch comprising, in % by weight based on oxide,

B 2 O 3 <5,

BaO>5.5, and

SnO 2 , 0.05–1.0;

and subsequently melting and hot forming a resultant alkali-free aluminosilicate glass.

2. A process according to claim 1 ,

wherein the alkali-free aluminosilicate glass batch (in % by weight based on oxide) comprises:

SiO 2

46+14 64

Al 2 O 3

12+14 26

B 2 O 3

+12 +12 0+14 +21 5

MgO

0+14 7

CaO

+11 3+14 14

SrO

+11 0+14 11

BaO

+11 6+14 25

ZrO 2

0+14 5

TiO 2

+11 +12 0+14 0.6

P 2 O 5

0+14 9

SnO 2

0.05+14 1.+10

3. A process according to claim 2 ,

wherein the alkali-free aluminosilicate glass batch (in % by weight based on oxide) comprises:

SiO 2

+22 55+14 64+12 +12

Al 2 O 3

13+14 18

B 2 O 3

+12 +12 0+14 +21 5

MgO

0+14 7

CaO

+11 5+14 14

SrO

0+14 8

BaO

+11 6+14 17

ZrO 2

0+14 2

TiO 2

+11 +12 0+14 0.5

SnO 2

0.05+14 1.+10

4. process according to claim 3 ,

wherein the alkali-free aluminosilicate glass batch (in % by weight based on oxide) comprises:

SiO 2

59+14 62

Al 2 O 3

13.5+14 15.5

B 2 O 3

+12 +12 3+14 +21 5

MgO

2.5+14 5+11 +12

CaO

+11 8.2+14 10.5

BaO

8.5+14 9.5

ZrO 2

+11 +12 0+14 1.5

TiO 2

+11 +12 0+14 0.5

SnO 2

0.05+14 1.+10

5. A process according to claim 3 ,

wherein the alkali-free aluminosilicate glass batch (in % by weight based on oxide) comprises:

SiO 2

+22 58+14 62+12 +12

Al 2 O 3

+11 +12 14+14 17.5

B 2 O 3

0+14 1

MgO

0+14 7

CaO

5.5+14 14+12

SrO

0+14 8

BaO

+11 6+14 17

ZrO 2

+11 +12 0+14 1.5

TiO 2

+11 +12 0+14 0.5

SnO 2

0.05+14 1.+10

6. A process according to claim 5 ,

wherein the alkali-free aluminosilicate glass batch (in % by weight based on oxide) comprises:

SiO 2

+22 58+14 62+12 +12

Al 2 O 3

+11 +12 15+14 17.5

B 2 O 3

0.2+14 0.7

MgO

+12 +12 0+14 +21 1

CaO

5.5+14 14+12

SrO

0+14 8

BaO

+11 6+14 10

ZrO 2

0.05+14 1+12 +10

TiO 2

+11 +12 0+14 0.5

SnO 2

0.05+14 1.+10

7. A process according to claim 2 ,

wherein the alkali-free aluminosilicate glass batch (in % by weight based on oxide) comprises:

SiO 2

46+14 63

Al 2 O 3

12+14 25

MgO

0+14 5

CaO

+11 3+14 14

SrO

+11 0+14 11

BaO

+11 6+14 15

with MgO +30 +0 CaO +30 +0 SrO +30 +0 BaO

+23 25

with SrO +30 +0 BaO

+24 10

ZrO 2

0.1+14 5+11 +12

P 2 O 5

0.1+14 9+11 +12

SnO 2

0.05+14 1.+10

8. A process according to claim 1 , wherein the alkali-free aluminosilicate batch comprises 0.1%–0.5% by weight of SnO 2 .

9. A process according to claim 1 , wherein no evaporation fining agents are added.

10. A process according to claim 1 , wherein no decomposition fining agents are added.

11. A process according to claim 1 , wherein the alkali-free aluminosilicate glass batch (in % by weight based on oxide) further comprises:

CeO 2

+11 +12 0+14 0.6

MoO 3

0+14 2

WO 3

0+14 2

V 2 O 5

+11 +12 0+14 0.2

MnO 2

+11 +12 0+14 0.2

Fe 2 O 3

+11 +12 0+14 0.5

where CeO 2 +30 +0 MoO 3 +30 +0 WO 3 +30 +0 V 2 O 5 +30 +0 MnO 2 +30 +0 Fe 2 O 3

+12 0+14 3.

12. A process according to claim 1 , wherein the alkali-free aluminosilicate glass batch is free from As 2 O 3, Sb 2 O 3, CdO, PbO, Bi 2 O 3 , except for unavoidable impurities.

13. Alkali-free aluminosilicate glass having a composition as follows (in % by weight based on oxide)

SiO 2

46+14 64

Al 2 O 3

12+14 26

B 2 O 3

+12 +12 0+14 +21 5

MgO

0+14 7

CaO

+11 3+14 14

SrO

+11 0+14 11

BaO

+11 6+14 25

ZrO 2

0+14 5

TiO 2

+11 +12 0+14 0.6

P 2 O 5

0+14 9

SnO 2

0.05+14 1.+10

14. Alkali-free aluminosilicate glass according to claim 13 ,

having

a composition as follows (in % by weight based on oxide):

SiO 2

+22 55+14 64+12 +12

Al 2 O 3

13+14 18

B 2 O 3

+12 +12 0+14 +21 5

MgO

0+14 7

CaO

+11 5+14 14

SrO

0+14 8

BaO

+11 6+14 17

ZrO 2

0+14 2

TiO 2

+12 +11 0+14 0.5

SnO 2

0.05+14 1.+10

15. Alkali-free aluminosilicate glass according to claim 14 ,

having

a composition as follows (in % by weight based on oxide):

SiO 2

59+14 62

Al 2 O 3

13.5+14 15.5

B 2 O 3

+12 +12 3+14 +21 5

MgO

2.5+14 5+12 +11

CaO

+11 8.2+14 10.5

BaO

8.5+14 9.5

ZrO 2

+11 +12 0+14 1.5

TiO 2

+11 +12 0+14 0.5

SnO 2

0.05+14 1.+10

16. Alkali-free aluminosilicate glass according to claim 14 ,

having

a composition as follows (in % by weight based on oxide):

SiO 2

+22 58+14 62+12 +12

Al 2 O 3

+11 +12 14+14 17.5

B 2 O 3

0+14 1

MgO

0+14 7

CaO

5.5+14 14+12

SrO

0+14 8

BaO

+11 6+14 17

ZrO 2

+11 +12 0+14 1.5

TiO 2

+12 +11 0+14 0.5

SnO 2

0.05+14 1.+10

17. Alkali-free aluminosilicate glass according to claim 16 ,

having

a composition as follows (in % by weight based on oxide):

SiO 2

+22 58+14 62+12 +12

Al 2 O 3

+11 +12 15+14 17.5

B 2 O 3

0.2+14 0.7

MgO

+12 +12 0+14 +21 1

CaO

5.5+14 14+12

SrO

0+14 8

BaO

+11 6+14 10

ZrO 2

0.05+14 1+10 +12

TiO 2

+12 +11 0+14 0.5

SnO 2

0.05+14 1.+10

18. Alkali-free aluminosilicate glass according to claim 13 ,

having

a composition as follows (in % by weight based on oxide):

SiO 2

46+14 63

Al 2 O 3

12+14 25

MgO

0+14 5

CaO

+11 3+14 14

SrO

+11 0+14 11

BaO

+11 6+14 15

where MgO +30 +0 CaO +30 +0 SrO +30 +0 BaO

+23 25

where SrO +30 +0 +0 BaO

+24 10

ZrO 2

0.1+14 5+11 +12

P 2 O 5

0.1+14 9+11 +12

SnO 2

0.05+14 1.+10

19. Alkali-free aluminosilicate glass according to claim 13 , further comprising

CeO 2

+11 +12 0+14 0.6

MoO 3

0+14 2

WO 3

0+14 2

V 2 O 5

+11 +12 0+14 0.2

MnO 2

+11 +12 0+14 0.2

Fe 2 O 3

+11 +12 0+14 0.5

where CeO 2 +0 +30 +0 MoO 3 +0 +30 +0 WO 3 +0 +30 +0 V 2 O 5 +0 +30 +0 MnO 2 +0 +30 +0 Fe 2 O 3

+12 0+14 3.

20. Alkali-free aluminosilicate glass according to claim 13 , which, except for unavoidable impurities, is free from As 2 O 3 , Sb 2 O 3 , CdO, PbO, Bi 2 O 3 .

21. A process for producing an alkali-fre aluminosilicate glass, comprising melting a composition comprising (in % by weight based on oxide):

B 2 O 3

+21 5;

BaO

+22 5.5; and

SnO 2

0.05+14 1.0

and glass components constituting the aluminosilicate glass.

22. A process according to claim 21 , further comprising batch charging the composition wherein the SnO 2 is added during batch charging.

23. A process according to claim 21 , wherein the SnO 2 is added during melting.

24. A process according to claim 22 , further comprising hot forming a glass made after melting.

25. A process according to claim 21 , wherein the composition comprises 0.1%–0.5%, by weight based on oxide of SnO 2 .

Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 14, 2005
From: SCHOTT GLAS
To: SCHOTT AG
Reel/Frame 015766/0926 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 8, 2003
From: NAUMANN, KARIN; OTT, FRANZ; DIEZEL, RALF; BECKER, OTMAR
To: SCHOTT GLAS
Reel/Frame 014477/0092 →
Priority Claims (1)
DE 100 34 985 · Jul 19, 2000 · national
Continuity (1)
Related Publication 20040029702A1 · Feb 12, 2004