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US 9,156,724 B2Granted
Ion exchangeable glass with high crack initiation threshold
AssigneeCorning Incorporated
InventorTimothy Michael Gross
Life of this patent
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Abstract
Alkali aluminosilicate glasses that are resistant to damage due to sharp impact and capable of fast ion exchange are provided. The glasses comprise at least 4 mol % P2O5 and, when ion exchanged, have a Vickers indentation crack initiation load of at least about 7 kgf.
Claims21
An alkali aluminosilicate glass comprising at least about 4% P2O5 and from 0 mol % to about 4 mol % B2O3, wherein the alkali aluminosilicate glass is Li2O-free and wherein:
- 1.3<[(P2O5+R2O)/M2O3]≦2.3;
- ii.
- where M2O3=Al2O3+B2O3, and R2O is the sum of monovalent cation oxides present in the alkali aluminosilicate glass.
Dependencies are inferred from the claim text.