US2009325778A1PendingUtilityA1
Silica-soda-lime glass compositions and their applications
Est. expiryMar 13, 2017(expired)· nominal 20-yr term from priority
C03C 3/087C03B 27/00C03C 4/00C03C 3/083C03C 23/007
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Claims
Abstract
The subject of the invention is a glass composition of the silica-soda-lime type, intended for the manufacture of substrates or sheets, the said glass composition having a φ coefficient of between 0.50 and 0.85 N/(mm2·° C.) and a working point of less than 1200° C.
Claims
exact text as granted — not AI-modified1 . A silica-soda-lime glass composition having a φ coefficient of between 0.50 and 0.85 N/(mm 2 ·° C.) and a working point of less than 1200° C.
2 . The glass composition according to claim 1 , wherein it has a softening point of greater than 750° C.
3 . The glass composition according to claim 1 , wherein the working point is less than 1190° C.
4 . The glass composition according to claim 1 , wherein the thermal expansion coefficient α 20-300 is between 60 and 88×10 −7 ° C. −1 .
5 . The glass composition according to claim 1 , wherein, wherein it satisfies the relationship:
φ 2 ·c/a< 2 MPa 2 /° C. 2 .
6 . The glass composition according to claim 1 , wherein it satisfies the relationship:
0.70 MPa 2 /° C. 2 <φ 2 ·c/a.
7 . The glass composition according to claim 1 , wherein it has a strain point of greater than 570° C. and preferably greater than 600° C.
8 . The glass composition according to claim 1 , wherein it comprises the constituents below in the following proportions by weight based on total weight:
SiO 2 —
55-75%
Al 2 O 3
0-7%
ZrO 2
0-8%
Na 2 O
5-10%
K 2 O
0-8%
CaO
8-12%.
9 . The glass composition according to claim 8 , wherein it comprises the constituents below in the following proportions by weight based on total weight:
SiO
69.60%
Al 2 O 3
0.90%
ZrO 2
2.60%
Na 2 O
7.10%
K 2 O
2.90%
CaO
10.50%
MgO
2.00%
SrO
3.90%
Fe 2 O 3
<0.15%
Other oxides
<0.50%.
10 . The glass composition according to claim 8 , wherein it comprises the constituents below in the following proportions by weight based on total weight:
SiO 2
74.40%
Al 2 O 3
0.95%
Na 2 O
9.05%
K 2 O
0.45%
CaO
9.10%
MgO
5.65%
Fe 2 O 3
0.10%
Other oxides
0.30%.
11 . The glass composition according to claim 1 , wherein it comprises the constituents below in the following proportions by weight based on total weight:
SiO 2
55-75%
Al 2 O 3
0-7%
ZrO 2
0-8%
Na 2 O
2-8%
K 2 O
2-8%
CaO
4-11%
MgO
0-4%.
12 . The glass composition according to claim 1 , wherein it has φ coefficient of less than 0.84, a strain point greater than 507° C. and an electrical resistivity such that its log ρ (250° C.) is greater than 6.6.
13 . The glass composition according to claim 12 , wherein the φ coefficient is less than 0.84 and greater than 0.75.
14 . The glass composition according to claim 12 , wherein its strain point is between 530 and 590° C.
15 . The glass composition according to claim 12 , wherein its electrical resistivity is such that log ρ (250° C.) is greater than 8.
16 . The glass composition according to claim 12 , wherein it comprises the constituents below in the following proportions by weight based on total weight:
SiO 2
55-75%
Al 2 O 3
0-5%
ZrO 2
3-8%
Na 2 O
4.5-8%
K 2 O
3.5-7.5%
CaO
7-11%.
17 . The glass composition according to claim 1 , in the form of a monolithic glazing panel resistant to fire according to the G fire resistance classes.
18 . A plasma-screen, electroluminescent-screen or cold-cathode-screen comprising the glass composition according to claim 1 .
19 . The glass composition according to claim 12 , in the form of a monolithic glazing panel resistant to fire according to the G fire resistance classes.
20 . A plasma-screen, electroluminescent-screen or cold-cathode-screen comprising the glass composition according to claim 12 .Join the waitlist — get patent alerts
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