STRENGTHENED GLASS ARTICLES HAVING IMPROVED SURVIVABILITY
First Claim
1. A strengthened glass article comprising:
- a thickness t≦
1 mm, an inner region under a central tension CT, and at least one compressive stress layer adjacent the inner region and extending within the strengthened glass article from a surface of the strengthened glass article to a depth of layer DOL, wherein the strengthened glass article is under a compressive stress at the surface CSs,wherein the strengthened glass article is an alkali aluminosilicate glass article comprising 0-5 mol % Li2O, and at least 3 mol % Al2O3, andwherein the DOL≧
70 μ
m, and a CSs/DOL ratio≧
2.5 MPa/μ
m.
1 Assignment
0 Petitions
Accused Products
Abstract
Embodiments are directed to strengthened glass articles comprising a thickness t≦1 mm (1000 μm), an inner region under a central tension CT (in MPa), and at least one compressive stress layer adjacent the inner region and extending within the strengthened glass article from a surface of the strengthened glass article to a depth of layer DOL (in μm), wherein the strengthened glass article is under a compressive stress at the surface CSs (in MPa), wherein the strengthened glass article is an alkali aluminosilicate glass article comprising 0-5 mol % Li2O, and at least 3 mol % Al2O3, and wherein the DOL≧70 μm, and a CSs/DOL ratio≧2.5 MPa/μm.
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Citations
64 Claims
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1. A strengthened glass article comprising:
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a thickness t≦
1 mm, an inner region under a central tension CT, and at least one compressive stress layer adjacent the inner region and extending within the strengthened glass article from a surface of the strengthened glass article to a depth of layer DOL, wherein the strengthened glass article is under a compressive stress at the surface CSs,wherein the strengthened glass article is an alkali aluminosilicate glass article comprising 0-5 mol % Li2O, and at least 3 mol % Al2O3, and wherein the DOL≧
70 μ
m, and a CSs/DOL ratio≧
2.5 MPa/μ
m. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A strengthened glass article comprising:
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a thickness t≦
1 mm, an inner region under a central tension CT, and at least one compressive stress layer adjacent the inner region and extending within the strengthened glass article from a surface of the strengthened glass article to a depth of layer DOL, wherein the strengthened glass article is under a compressive stress at the surface CSs,wherein the strengthened glass article is an alkali aluminosilicate glass article comprising 0-5 mol % Li2O, at least 3 mol % Al2O3, and at least 5 mol % Na2O, and wherein the DOL≧
70 μ
m, a CSs/DOL ratio 2.5 MPa/μ
m, and wherein the strengthened glass article, when subjected to a point impact sufficient to break the strengthened glass article, has a frangibility index of less than 3. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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28. A strengthened glass article comprising:
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a thickness t≦
1 mm, an inner region under a central tension CT, and at least one compressive stress layer adjacent the inner region and extending within the strengthened glass article from a surface of the strengthened glass article to a depth of layer DOL, wherein the strengthened glass article is under a compressive stress at the surface CSs,wherein the strengthened glass article is an alkali aluminosilicate glass article comprising 0-5 mol % Li2O, at least 3 mol % Al2O3, and at least 5 mol % Na2O, and wherein the DOL≧
70 μ
m, a CSs/DOL ratio≧
3.0 MPa/μ
m, and the CT≦
150 MPa. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37)
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- 38. A strengthened glass, the strengthened glass having an inner region under a central tension CT, and at least one compressive stress layer under a compressive stress CS, the compressive stress layer extending from a surface of the glass to a depth of compression and being adjacent to the inner region, wherein the strengthened glass has at least a 60% survival rate when dropped in a drop test from a height of at least 100 cm onto a drop surface utilizing a uniform drop testing procedure.
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43. A method of producing a strengthened glass article having a thickness t≦
- 1 mm and at least one compressive stress layer extending from a surface of the strengthened glass article to a depth of layer DOL≧
70 μ
m, the method comprising;conducting a first ion exchange step by immersing an alkali aluminosilicate glass article in a first ion exchange bath at a temperature of greater than 400°
C. for a time sufficient such that the compressive stress layer has a depth of at least 70 μ
m after the first ion exchange step; andoptionally conducting a second ion exchange step by immersing the alkali aluminosilicate glass article in a second ion exchange bath different from the first ion exchange bath at a temperature of at least 350°
C. for a time sufficient to produce the compressive layer having DOL≧
90 μ
m. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59)
- 1 mm and at least one compressive stress layer extending from a surface of the strengthened glass article to a depth of layer DOL≧
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60. A method of performing a glass drop test on a glass product, the method comprising:
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providing a drop surface having an abrasive sandpaper upper surface, the abrasive sandpaper upper surface having a grit of at least 150; dropping the glass product number of times (n) from a drop height, dn=d1+(n−
1)*k, onto the drop surface, wherein d1 is an initial drop height, n refers to the number of repetitions of the glass drop within the glass drop test, and k is an increment for increasing drop heights for successive glass drop repetitions, and wherein the drop surface has an abrasive sandpaper upper surface, the abrasive sandpaper upper surface having a grit of at least 150;determining if there is fracture in the strengthened glass product after each drop; and ending the glass drop test upon detecting a fracture in the glass product or when the glass product is not fractured when dropped from a maximum drop height. - View Dependent Claims (61, 62, 63, 64)
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Specification