Glass substrate for display and display
View Patent ↗A glass substrate for a display, which is formed of a glass having a light weight and having high refinability with decreasing environmental burdens, the glass comprising, by mass %, 50 to 70% of SiO 2 , 5 to 18% of B 2 O 3 , 10 to 25% of Al 2 O 3 , 0 to 10% of MgO, 0 to 20% of CaO, 0 to 20% of SrO, 0 to 10% of BaO, 5 to 20% of RO (in which R is at least one member selected from the group consisting of Mg, Ca, Sr and Ba), and over 0.20% but not more than 2.0% of R′ 2 O (in which R′ is at least one member selected from the group consisting of Li, Na and K), and containing, by mass %, 0.05 to 1.5% of oxide of metal that changes in valence number in a molten glass, and substantially containing none of As 2 O 3 , Sb 2 O 3 and PbO.
1. A glass substrate for a display, which is formed of a glass comprising, by mass %,
50 to 70% of SiO 2 ,
5 to 18% of B 2 O 3 ,
10 to 25% of Al 2 O 3 ,
0 to 10% of MgO,
0 to 20% of CaO,
0 to 20% of SrO,
0 to 10% of BaO,
5 to 20% of RO (in which R is at least one member selected from the group consisting of Mg, Ca, Sr and Ba), and
0.20% or more but not more than 2.0% of R′ 2 O (in which R′ is at least one member selected from the group consisting of Li, Na and K),
the glass containing, by mass %, 0.05 to 1.5% of an oxide of a metal that changes in valence number in a molten glass, and
substantially containing none of As 2 O 3 , Sb 2 O 3 and PbO.
2. The glass substrate for a display as recited in claim 1 , wherein the glass comprises, by mass %,
55 to 65% of SiO 2 ,
10 to 14% of B 2 O 3 ,
15 to 19% of Al 2 O 3 ,
1 to 3% of MgO,
4 to 7% of CaO,
1 to 4% of SrO,
0 to 2% of BaO,
6 to 16% of RO in which R is at least one member selected from the group consisting of Mg, Ca, Sr and Ba, and
0.20% or more but not more than 2.0% of R′ 2 O in which R′ is at least one member selected from the group consisting of Li, Na and K,
the glass containing, by mass %, of 0.1 to 1.5% of an oxide of a metal that changes in valence number in a molten glass, and
substantially containing none of As 2 O 3 , Sb 2 O 3 and PbO.
3. The glass substrate for a display as recited in claim 1 , wherein the content of R 2 ′O is 0.20% or more but not more than 0.5%.
4. The glass substrate for a display as recited in claim 1 , wherein the glass contains K 2 O as R′ 2 O and substantially contains none of Li 2 O and Na 2 O.
5. The glass substrate for a display as recited in claim 1 , wherein the glass contains at least one member selected from the group consisting of tin oxide, iron oxide and cerium oxide as an oxide of a metal that changes in valence number in a molten glass.
6. The glass substrate for a display as recited in claim 5 , wherein the glass has a tin oxide content in the range of 0.01 to 0.5%.
7. The glass substrate for a display as recited in claim 5 , wherein the glass has an iron oxide content in the range of 0.05 to 0.2%.
8. The glass substrate for a display as recited in claim 5 , wherein the glass has a cerium oxide content in the range of 0 to 1.2%.
9. The glass substrate for a display as recited in claim 1 , wherein a content of sulfur oxide in the glass is limited to, as SO 3 , 0 mass % or more but less than 0.010 mass %.
10. The glass substrate for a display as recited in claim 1 , wherein a content of whole halide ion in the glass is limited to 0 mass % or more but less than 0.05 mass %.
11. The glass substrate for a display as recited in claim 1 , wherein the glass has a density of 2.49 g/cm 3 or less.
12. The glass substrate for a display as recited in claim 1 , wherein the glass has a linear thermal expansion coefficient of 28×10 −7 to 39×10 −7 /° C. at a temperature between 50° C. and 300° C.
13. A display having the glass substrate for a display as recited in claim 1 .
14. The display of claim 13 , which is a liquid crystal display.