Stock material or miscellaneous articles – Magnetic recording component or stock – Magnetic recording media substrate
Reexamination Certificate
2011-06-21
2011-06-21
Bernatz, Kevin M. (Department: 1785)
Stock material or miscellaneous articles
Magnetic recording component or stock
Magnetic recording media substrate
C428S064100, C501S069000, C065S033400
Reexamination Certificate
active
07964298
ABSTRACT:
A glass for use in chemical reinforcement for use in a substrate of an information recording medium, having a composition comprising, denoted as mol %:SiO247 to 70% Al2O31 to 10%(where the total of SiO2and Al2O3is 57 to 80%)CaO2 to 25%BaO1 to 15%Na2O1 to 10%K2O0 to 15%(where the total of Na2O and K2O is 3 to 16%)ZrO21 to 12%MgO0 to 10%SrO0 to 15%(where the ratio of the content of CaO to the total of MgO, CaO,SrO, and BaO is greater than or equal to 0.5)ZnO0 to 10%(where the total of MgO, CaO, SrO, BaO, and ZnO is 3 to 30%)TiO20 to 10%and the total content of the above-stated components is greaterthan or equal to 95%.A glass for use in chemical reinforcement for use in the substrate of an information recording medium employed in a perpendicular magnetic recording system, in which the glass exhibits the glass transition temperature is greater than or equal to 600° C. A substrate for use in an information recording medium consisting of the above glass and being chemically reinforced. A substrate for an information recording medium consisting of a chemically reinforced glass having a glass transition temperature of greater than or equal to 600° C. and exhibiting a bending strength following heating for two hours at 570° C. of greater than or equal to 15 kgf/mm2. An information recording medium comprising an information recording layer on the above substrate for an information recording medium. The present invention provides glass having both high thermal resistance and high strength, a substrate for use in information recording media comprised of this glass, and an information recording medium employing such a substrate.
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JA 10-72238 Abstact Speit.
JA 10-72238 Translation.
Ikenishi Mikio
Zou Xuelu
Bernatz Kevin M.
Falasco Louis
Hoya Corporation
Sughrue & Mion, PLLC
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