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Title:
GLASS FOR MAGNETIC RECORDING MEDIUM SUBSTRATE, MAGNETIC RECORDING MEDIUM SUBSTRATE, AND MAGNETIC RECORDING MEDIUM
Document Type and Number:
WIPO Patent Application WO/2017/002835
Kind Code:
A1
Abstract:
In this glass for a magnetic recording medium substrate, the content of SiO2 is 56-75%, the content of Al2O3 is 0.1-10%, the content of Li2O is 0-2%, the total content of Na2O and K2O is 3-15%, the total content of MgO, CaO and SrO is 14-35%, the content of Ti oxides is 0.20-2.50%, the total content of Sn oxides and Ce oxides is 0.10-1.55% and the content of Sb oxides is 0-0.02%, each in terms of mol.%. The molar ratio of the content of Li2O relative to the total content of SiO2 and Al2O3 {Li2O / (SiO2+Al2O3)} is 0.02 or lower, and the glass transition temperature is 600°C or higher.

Inventors:
SHIMOJIMA Shoji (6-10-1 Nishi-Shinjuku, Shinjuku-k, Tokyo 47, 〒1608347, JP)
Application Number:
JP2016/069215
Publication Date:
January 05, 2017
Filing Date:
June 29, 2016
Export Citation:
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Assignee:
HOYA CORPORATION (6-10-1, Nishi-Shinjuku Shinjuku-k, Tokyo 47, 〒1608347, JP)
International Classes:
C03C3/085; C03C3/087; G11B5/73
Domestic Patent References:
2011-02-17
2011-03-31
2012-05-03
Foreign References:
JPH1072238A1998-03-17
JP2005330176A2005-12-02
JPH09138942A1997-05-27
Attorney, Agent or Firm:
SIKS & CO. (8th Floor, Kyobashi-Nisshoku Bldg. 8-7, Kyobashi 1-chome, Chuo-k, Tokyo 31, 〒1040031, JP)
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