COVER GLASS AND METHOD FOR PRODUCING SAME
First Claim
1. A cover glass comprising a compressive-stress layer on the principal surfaces thereof, the cover glass having a glass composition containingto 70% by mole of SiO2,to 20% by mole of Al2O3,to 25% by mole of Na2O,more than 0% by mole and less than or equal to 2.5% by mole of Li2O,to 5.5% by mole of K2O, andto less than 3% by mole of B2O3.
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Accused Products
Abstract
A cover glass having a compressive-stress layer on the principal surfaces thereof, and having a glass composition containing 50% to 70% by mole of SiO2, 3% to 20% by mole of Al2O3, 5% to 25% by mole of Na2O, more than 0% by mole and less than or equal to 2.5% by mole of Li2O, 0% to 5.5% by mole of K2O, and 0% to less than 3% by mole of B2O3. Also disclosed is a method for producing a cover glass which includes: (i) preparing molten glass by melting a glass raw material; (ii) forming the prepared molten glass into a plate-like shape by a down-draw process and thereby obtaining a glass substrate; and (iii) forming a compressive-stress layer on the surface of the glass substrate.
82 Citations
16 Claims
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1. A cover glass comprising a compressive-stress layer on the principal surfaces thereof, the cover glass having a glass composition containingto 70% by mole of SiO2,to 20% by mole of Al2O3,to 25% by mole of Na2O,
more than 0% by mole and less than or equal to 2.5% by mole of Li2O, to 5.5% by mole of K2O, andto less than 3% by mole of B2O3.
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6. A method for producing a cover glass, comprising:
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(i) preparing molten glass by melting a glass raw material; (ii) forming the prepared molten glass into a plate-like shape by a down-draw process and thereby obtaining a glass substrate having a glass composition containing 50% to 70% by mole of SiO2, 3% to 20% by mole of Al2O3, 5% to 25% by mole of Na2O, more than 0% by mole and less than or equal to 2.5% by mole of Li2O, 0% to 5.5% by mole of K2O, and 0% to less than 3% by mole of B2O3; and (iii) forming a compressive-stress layer on the surface of the glass substrate.
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7. A strengthened glass comprising a compressive-stress layer on the principal surfaces thereof, the strengthened glass having a glass composition containingto 70% by mole of SiO2,to 20% by mole of Al2O3,to 25% by mole of Na2O,
more than 0% by mole and less than or equal to 2.5% by mole of Li2O, to 5.5% by mole of K2O, andto less than 3% by mole of B2O3.
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8. A cover glass comprising a compressive-stress layer on the principal surfaces thereof, the cover glass having a glass composition containingto 70% by mass of SiO2,to 25% by mass of Al2O3,to 25% by mass of Na2O,
more than 0% by mass and less than or equal to 2.5% by mass of Li2O, to 3% by mass of B2O3, andmore than 0% by mass and less than or equal to 10% by mass of MgO.
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15. A method for producing a cover glass, comprising:
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(i) preparing molten glass by melting a glass raw material; (ii) forming the prepared molten glass into a plate-like shape by a down-draw process and thereby obtaining a glass substrate having a glass composition containing 45% to 70% by mass of SiO2, 5% to 25% by mass of Al2O3, 9% to 25% by mass of Na2O, more than 0% by mass and less than or equal to 2.5% by mass of Li2O, 0% to 3% by mass of B2O3, and more than 0% by mass and less than or equal to 10% by mass of MgO; and (iii) forming a compressive-stress layer on the surface of the glass substrate. - View Dependent Claims (16)
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Specification
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- Resources
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Current AssigneeHoya Corporation, Avanstrate, Inc. (Volcan Investments Ltd.)
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Original AssigneeHoya Corporation, Avanstrate, Inc. (Volcan Investments Ltd.)
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InventorsKOYAMA, Akihiro, AMI, Satoshi, HASHIMOTO, Kazuaki, TAKANO, Tetsuo
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current428/428
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CPC Class CodesC03C 21/002 to perform ion-exchange bet...C03C 3/085 containing an oxide of a di...Y10T 428/315 Surface modified glass [e.g...
