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Patent Searching and Data


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.

Inventors:
KUROIWA Yutaka (Limited 5-1, Marunouchi 1-chome, Chiyoda-k, Tokyo 05, 〒1008405, JP)
NAKASHIMA Tetsuya (Limited 5-1, Marunouchi 1-chome, Chiyoda-k, Tokyo 05, 〒1008405, JP)
NAGAI Kensuke (Limited 5-1, Marunouchi 1-chome, Chiyoda-k, Tokyo 05, 〒1008405, JP)
Application Number:
JP2017/019244
Publication Date:
November 30, 2017
Filing Date:
May 23, 2017
Export Citation:
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Assignee:
ASAHI GLASS COMPANY, LIMITED (5-1 Marunouchi 1-chome, Chiyoda-ku Tokyo, 05, 〒1008405, JP)
International Classes:
C03C3/083; C03C3/085; C03C3/087; C03C3/091; C03C3/093; G11B5/73; G11B5/84
Attorney, Agent or Firm:
EIKOH PATENT FIRM, P.C. (Toranomon East Bldg. 10F, 7-13 Nishi-Shimbashi 1-chome, Minato-k, Tokyo 03, 〒1050003, JP)
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