Invention Grant
- Patent Title: Glass composition, glass composition for chemical strengthening, strengthened glass article, and cover glass for display
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Application No.: US14766353Application Date: 2014-02-06
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Publication No.: US09783451B2Publication Date: 2017-10-10
- Inventor: Aya Nakamura , Junji Kurachi
- Applicant: Nippon Sheet Glass Company, Limited
- Applicant Address: JP Tokyo
- Assignee: NIPPON SHEET GLASS COMPANY, LIMITED
- Current Assignee: NIPPON SHEET GLASS COMPANY, LIMITED
- Current Assignee Address: JP Tokyo
- Agency: Hamre, Schumann, Mueller & Larson, P.C.
- Priority: JP2013-022113 20130207
- International Application: PCT/JP2014/000647 WO 20140206
- International Announcement: WO2014/122935 WO 20140814
- Main IPC: C03C3/085
- IPC: C03C3/085 ; C03C3/087 ; C03C21/00 ; C03C3/093
Abstract:
Provided is a glass composition containing, in mol %: 56 to 66% SiO2; 6 to 12% Al2O3; 5 to 14% MgO; 0 to 1% CaO; 17 to 24% Na2O; and 0 to 3% K2O. The total content of Li2O, Na2O, and K2O is in a range of 18.5 to 24%. This glass composition is suitable for production by a float process and for introduction of a compressive stress layer with a high crack initiation load, a high surface compressive stress, and a large thickness by chemical strengthening.
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