Process for producing glass substrate for information recording medium and process for producing recording medium using said glass substrate
US6427489B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 15, 2000 |
| Grant date | Aug 6, 2002 |
| Priority date | — |
| Expiry date | May 15, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/8404
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for producing a glass substrate for an information recording medium comprising: (a) providing a chemical reinforcement tank comprising a chemical reinforcement liquid contained therein, and a holding means for holding a glass substrate; and (b) chemically strengthening the glass substrate by immersing the glass substrate in the chemical reinforcement liquid, wherein ions are exchanged on the surface of the glass substrate with ions in the chemical reinforcement liquid having a diameter larger than that in the glass substrate; wherein at least one of a wall surface of the chemical reinforcement tank and the holding means is made from a stainless alloy which exhibits corrosion resistance in a high temperature region of the chemical reinforcement liquid, the stainless alloy being made from a martensitic stainless alloy or an austenitic stainless alloy. Such process prevents the adhesion of particles, such as fine iron particles onto the glass substrate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.