Glass substrate for magnetic disk, its production method and...

Details Glass substrate for magnetic disk, its production method and... Glass substrate for magnetic disk, its production method and...

2007-06-20

2009-11-17

Tarazano, D. Lawrence (Department: 1794)

Stock material or miscellaneous articles

Magnetic recording component or stock

Magnetic recording media substrate

C428S848600, C065S061000, C510S178000

Reexamination Certificate

active

07618723

ABSTRACT:
A method for producing a glass substrate for a magnetic disk by polishing a circular glass plate, which comprises a step of polishing the principal plane of the circular glass plate by using a slurry containing at least one water-soluble polymer selected from the group consisting of a water-soluble organic polymer having amino groups, a water-soluble organic polymer having amine salt groups and a water-soluble organic polymer having quaternary ammonium salt groups, and colloidal silica.

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U.S. Appl. No. 11/765,702, Jun. 20, 2007, Usui et al.
U.S. Appl. No. 11/739,997, Apr. 25, 2007, Miyatani et al.

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