Invention Grant
US08563149B2 Glass for data storage medium substrate, glass substrate for data storage medium and magnetic disk
有权
用于数据存储介质基板的玻璃，用于数据存储介质的玻璃基板和磁盘
- Patent Title: Glass for data storage medium substrate, glass substrate for data storage medium and magnetic disk
- Patent Title (中): 用于数据存储介质基板的玻璃，用于数据存储介质的玻璃基板和磁盘
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Application No.: US12716467Application Date: 2010-03-03
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Publication No.: US08563149B2Publication Date: 2013-10-22
- Inventor: Tatsuo Nagashima , Kensuke Nagai , Tetsuya Nakashima , Kei Maeda
- Applicant: Tatsuo Nagashima , Kensuke Nagai , Tetsuya Nakashima , Kei Maeda
- Applicant Address: JP Tokyo
- Assignee: Asahi Glass Company, Limited
- Current Assignee: Asahi Glass Company, Limited
- Current Assignee Address: JP Tokyo
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2008-016550 20080128
- Main IPC: G11B5/706
- IPC: G11B5/706 ; C03C3/23
Abstract:
To provide glass for a data storage medium substrate, whereby high heat resistance can be obtained.Glass for a data storage medium substrate, which comprises, as represented by mol percentage based on the following oxides, from 55 to 70% of SiO2, from 2.5 to 9% of Al2O3, from 0 to 10% of MgO, from 0 to 7% of CaO, from 0.5 to 10% of SrO, from 0 to 12.5% of BaO, from 0 to 2.5% of TiO2, from 0.5 to 3.7% of ZrO2, from 0 to 2.5% of Li2O, from 0 to 8% of Na2O, from 2 to 8% of K2O and from 0.5 to 5% of La2O3, provided that the total content of Al2O3 and ZrO2 (Al2O3+ZrO2) is at most 12%, and the total content of Li2O, Na2O and K2O (R2O) is at most 12%.
Public/Granted literature
- US20110152058A1 GLASS FOR DATA STORAGE MEDIUM SUBSTRATE, GLASS SUBSTRATE FOR DATA STORAGE MEDIUM AND MAGNETIC DISK Public/Granted day:2011-06-23
Information query
IPC分类:
