Title:
GLASS FOR MAGNETIC RECORDING MEDIA, GLASS SUBSTRATE FOR MAGNETIC RECORDING MEDIA, AND MAGNETIC DISK
Document Type and Number:
WIPO Patent Application WO/2017/204224
Kind Code:
A1
Abstract:
The present invention provides: a glass for use in magnetic recording media, which enables reduction of heat cracking arising from a temperature distribution in a glass substrate during a process for heating the glass substrate over 600°C even when the glass transition temperature is raised to 650°C or higher; a glass substrate for magnetic recording media, which comprises said glass; and a magnetic disk. The present invention pertains to a glass for use in magnetic recording media, wherein the glass composition falls within a specific range, and an alkaline earth metal oxide and an alkali metal oxide are included in amounts that satisfy a specific relational expression.
More Like This:
Inventors:
KUROIWA YUTAKA (JP)
NAKASHIMA TETSUYA (JP)
NAGAI KENSUKE (JP)
NAKASHIMA TETSUYA (JP)
NAGAI KENSUKE (JP)
Application Number:
PCT/JP2017/019244
Publication Date:
November 30, 2017
Filing Date:
May 23, 2017
Export Citation:
Assignee:
ASAHI GLASS CO LTD (JP)
International Classes:
C03C3/083; C03C3/085; C03C3/087; C03C3/091; C03C3/093; G11B5/73; G11B5/84
Foreign References:
| JP2014088320A | 2014-05-15 | |||
| JP2002201040A | 2002-07-16 | |||
| JP2015028827A | 2015-02-12 | |||
| JP2015027931A | 2015-02-12 | |||
| JP2015054794A | 2015-03-23 | |||
| JP2013028512A | 2013-02-07 | |||
| JP2012256389A | 2012-12-27 | |||
| JP2001291229A | 2001-10-19 |
Attorney, Agent or Firm:
EIKOH PATENT FIRM, P.C. (JP)
Download PDF: