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 (JP)
Application Number:
PCT/JP2016/069215
Publication Date:
January 05, 2017
Filing Date:
June 29, 2016
Export Citation:
Assignee:
HOYA CORP (JP)
International Classes:
C03C3/085; C03C3/087; G11B5/73
Domestic Patent References:
| WO2011019010A1 | 2011-02-17 | |||
| WO2011037001A1 | 2011-03-31 | |||
| WO2012057338A1 | 2012-05-03 |
Foreign References:
| JPH1072238A | 1998-03-17 | |||
| JP2005330176A | 2005-12-02 | |||
| JPH09138942A | 1997-05-27 |
Attorney, Agent or Firm:
SIKS & CO. (JP)
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