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Title:
METHOD FOR PRODUCING MAGNETIC DISK AND GLASS SUBSTRATE FOR INFORMATION RECORDING MEDIA
Document Type and Number:
WIPO Patent Application WO/2013/183569
Kind Code:
A1
Abstract:
The present invention provides a method for producing a magnetic disk, which is capable of forming a magnetic recording layer at high temperature. The present invention relates to a method for producing a magnetic disk, which comprises a step wherein a magnetic recording layer is formed on a glass substrate that is at a temperature of 550°C or more, and in which the glass substrate contains, in mol%, 60-75% of SiO2, 7-17% of Al2O3, 0% or more but less than 2% of B2O3, and one or more substances selected from among MgO, CaO, SrO and BaO in an amount of more than 18% but 26% or less in total, with the total of the above-mentioned seven components being 95% or more, while containing one or more substances selected from among Li2O, Na2O and K2O in an amount of less than 1% or not containing any of these three substances.

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Inventors:
NAKASHIMA TETSUYA (JP)
TSUJIMURA TOMOYUKI (JP)
NISHIZAWA MANABU (JP)
KOIKE AKIO (JP)
Application Number:
PCT/JP2013/065285
Publication Date:
December 12, 2013
Filing Date:
May 31, 2013
Export Citation:
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Assignee:
ASAHI GLASS CO LTD (JP)
International Classes:
C03C3/085; C03C3/087; C03C3/091; G11B5/73; G11B5/84
Domestic Patent References:
WO2011136027A12011-11-03
Foreign References:
JPH0912333A1997-01-14
JPS61261232A1986-11-19
JPS61236631A1986-10-21
Attorney, Agent or Firm:
HAMADA Yuriko et al. (JP)
Yuriko Hamada (JP)
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