Glass substrate for information recording medium and...

Details Glass substrate for information recording medium and... Glass substrate for information recording medium and...

2006-08-15

2006-08-15

Chaney, Carol (Department: 1773)

Stock material or miscellaneous articles

Magnetic recording component or stock

Magnetic recording media substrate

C428S848800, C501S011000, C501S065000

Reexamination Certificate

active

07090937

ABSTRACT:
Disclosed are a glass substrate for an information recording medium, having excellent scratch resistance and a light weight and having high fracture toughness, the glass substrate having a fragility index value, measured in water, of 12 μm−1/2or less or having a fragility index value, measured in an atmosphere having a dew point of −5° C. or lower, of 7 μm−1/2or less, or the glass substrate comprising, by mol %, 40 to 75% of SiO2, 2 to 45% of B2O3and/or Al2O3and 0 to 40% of R′2O in which R′ is at least one member selected from the group consisting of Li, Na and K), wherein the total content of SiO2, B2O3, Al2O3and R′2O is at least 90 mol %, and a magnetic information recording medium comprising a magnetic recording layer formed on the glass substrate.

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Translation of Japan Patent Publication 09-052729.

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