Glass for information recording media substrate, glass...

Details Glass for information recording media substrate, glass... Glass for information recording media substrate, glass...

2008-10-22

2010-11-23

Bernatz, Kevin M. (Department: 1785)

Stock material or miscellaneous articles

Magnetic recording component or stock

Magnetic recording media substrate

C428S410000, C065S030140

Reexamination Certificate

active

07838136

ABSTRACT:
To provide a glass for an information recording media substrate, which is excellent in weather resistance.A glass for an information recording media substrate, which comprises, as represented by mol % based on oxide, from 61 to 66% of SiO2, from 11.5 to 17% of Al2O3, from 8 to 16% of Li2O, from 2 to 8% of Na2O, from 2.5 to 8% of K2O, from 0 to 6% of MgO, from 0 to 4% of TiO2and from 0 to 3% of ZrO2, provided that Al2O3+MgO+TiO2is at least 12%, and Li2O+Na2O+K2O is from 16 to 23%, wherein in a case of where B2O3is contained, its content is less than 1%. The above glass for an information recording media substrate, wherein when the glass is left under steam atmosphere at 120° C. at 0.2 MPa for 20 hours, and the amount of Li, the amount of Na and the amount of K, which precipitate on a surface of the glass are represented as CLi, CNaand CKrespectively, CNais at most 0.7 nmol/cm2, and CLi+CNa+CKis at most 3.5 nmol/cm2.

REFERENCES:
patent: 4944986 (1990-07-01), Zuel
patent: 5846278 (1998-12-01), Jantzen et al.
patent: 6132843 (2000-10-01), Kuroda et al.
patent: 6251812 (2001-06-01), Koyama et al.
patent: 6313052 (2001-11-01), Nakashima et al.
patent: 6387510 (2002-05-01), Nakashima et al.
patent: 6818576 (2004-11-01), Ikenishi et al.
patent: 6949485 (2005-09-01), Nakashima et al.
patent: 2003/0109370 (2003-06-01), Ikenishi et al.
patent: 2009/0137379 (2009-05-01), Nagai et al.
patent: 2000-351649 (2000-12-01), None
patent: 2002-358626 (2002-12-01), None
patent: 2006-290704 (2006-10-01), None
patent: WO 2008/062847 (2008-05-01), None
Translation Nakaima et al Dec. 2000, JP 2000-351649.

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