Glass plate for display devices
First Claim
1. A glass plate for display devices, which is obtained by chemically tempering a glass plate comprising, as represented by mol % based on the following oxides,from 50 to 74% of SiO2,from 1 to 10% of Al2O3,from 6 to 14% of Na2O,from 4.0 to 15% of K2O,at most 15% of MgO,from 0 to 0.5% of CaO andfrom 0 to 5% of ZrO2,whereinthe total content of SiO2 and Al2O3 is at most 75%,the total content of Na2O and K2O is from 12 to 25%,the total content of MgO and CaO is at most 15%,the content of MgO is at least 6.5 mass %,said glass plate is chemically tempered, andsaid glass plate has a thickness of 0.2 to 1.0 mm.
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Abstract
To provide a glass plate for display devices wherein without carrying out a post treatment, the depth of a compression stress layer is increased, while the surface compression stress is prevented from being excess only by chemical tempering. A glass plate for display devices, which is obtained by chemically tempering a glass plate comprising, as represented by mol % based on the following oxides, from 50 to 74% of SiO2, from 1 to 10% of Al2O3, from 6 to 14% of Na2O, from 3 to 15% of K2O, from 2 to 15% of MgO, from 0 to 10% of CaO and from 0 to 5% of ZrO2, wherein the total content of SiO2 and Al2O3 is at most 75%, the total content of Na2O and K2O, i.e. Na2O+K2O, is from 12 to 25%, and the total content of MgO and CaO, i.e. MgO+CaO, is from 7 to 15%.
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Citations
22 Claims
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1. A glass plate for display devices, which is obtained by chemically tempering a glass plate comprising, as represented by mol % based on the following oxides,
from 50 to 74% of SiO2, from 1 to 10% of Al2O3, from 6 to 14% of Na2O, from 4.0 to 15% of K2O, at most 15% of MgO, from 0 to 0.5% of CaO and from 0 to 5% of ZrO2, wherein the total content of SiO2 and Al2O3 is at most 75%, the total content of Na2O and K2O is from 12 to 25%, the total content of MgO and CaO is at most 15%, the content of MgO is at least 6.5 mass %, said glass plate is chemically tempered, and said glass plate has a thickness of 0.2 to 1.0 mm.
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11. A glass plate for display devices, wherein the glass plate comprises, as represented by mol % based on the following oxides,
from 60 to 70% of SiO2, from 2 to 8% of Al2O3, from 6 to 14% of Na2O, from 3.5 to 8% of K2O, at most 15% of MgO, from 0 to 0.5% of CaO and from 0 to 5% of ZrO2, wherein the total content of SiO2 and Al2O3 is at most 75%, the total content of Na2O and K2O is at most 18%, the total content of MgO and CaO is at most 15%, the sum of the content of K2O multiplied by 1.7 and the content of Na2O is less than 19%, the content of MgO is at least 6.5 mass %, said glass plate is chemically tempered, and said glass plate has a thickness of 0.2 to 1.0 mm.
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20. A glass plate for display devices, wherein in the glass plate comprises, as represented by mol % based on the following oxides,
SiO2 is from 63% to 74%, Al2O3 is from 3% to 10%, Na2O is from 8% to 12%, K2O is from 4 to 8%, MgO is at most 14%, CaO is from 0 to 1%, ZrO2 is from 1 to 4%, and wherein the total content of SiO2 and Al2O3 is at most 75%, Na2O+K2O is from 14 to 17%, the difference obtained by deducting the content of Al2O3 from Na2O+K2O is at least 10%, the total content of MgO and CaO is at most 15%, the content of MgO is at least 6.5 mass %, said glass plate is chemically tempered, and said glass plate has a thickness of 0.2 to 1.0 mm.
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22. A glass plate for display devices, wherein said glass plate comprises, as represented by mol % based on the following oxides,
from 50 to 74% of SiO2, from 1 to 10% of Al2O3, from 6 to 12% of Na2O, from 4 to 15% of K2O, MgO is at most 14%, from 0 to 10% of CaO and from 0 to 5% of ZrO2, B2O3 in a non-zero amount and the amount of B2O3 is less than 1% wherein the total content of SiO2 and Al2O3 is at most 75%, the total content of Na2O and K2O is from 14 to 25%, the difference obtained by deducting the content of Al2O3 from Na2O+K2O is at least 10%, the total content of MgO and CaO is at most 15%, the content of MgO is at least 6.5 mass %, said glass plate is chemically tempered, and said glass plate has a thickness of 0.2 to 1.0 mm.
Specification
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- Resources
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Current AssigneeAGC, Inc.
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Original AssigneeAsahi Glass Company, Limited (AGC, Inc.)
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InventorsAkiba, Shusaku, Hayashi, Kazutaka, Maeda, Kei
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Primary Examiner(s)Group, Karl
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Assistant Examiner(s)Bolden, Elizabeth A
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Application NumberUS12/474,667Publication NumberTime in Patent Office1,803 DaysField of Search501/69, 501/70, 428/410, 428/426US Class Current428/410CPC Class CodesC03C 3/085 containing an oxide of a di...C03C 3/087 containing calcium oxide, e...Y10T 428/315 Surface modified glass [e.g...
