Title:
HDD GLASS SUBSTRATE MANUFACTURING METHOD
Document Type and Number:
WIPO Patent Application WO/2013/099148
Kind Code:
A1
Abstract:
This HDD glass substrate manufacturing method is characterized by involving: a rough polishing step, in which a glass substrate is polished using an abrasive slurry containing an abrasive agent, wherein said abrasive agent contains an abrasive material with cerium oxide as a main component, a dispersant containing anionic polymers having a carboxyl group inside the molecule, and first group element or second group element positive ions having an 80-160pm ionic radius in six-coordinate conversion; a chemical strengthening step performed after the rough polishing step; and a precision polishing step in which the rough-polished glass substrate undergoes precision polishing, wherein the content of the positive ions is 0.05-5 mmol/kg relative to the content of the cerium oxide.
Inventors:
NAKAE HAZUKI (JP)
Application Number:
PCT/JP2012/008057
Publication Date:
July 04, 2013
Filing Date:
December 17, 2012
Export Citation:
Assignee:
KONICA MINOLTA INC (JP)
International Classes:
G11B5/84; C03C19/00
Foreign References:
| JP2004055128A | 2004-02-19 | |||
| JPH06330025A | 1994-11-29 | |||
| JPH03146585A | 1991-06-21 | |||
| JP2011018398A | 2011-01-27 |
Attorney, Agent or Firm:
KOTANI, Etsuji et al. (JP)
Etsuji Kotani (JP)
Etsuji Kotani (JP)
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Claims: