Process for producing glass substrate for information recording

Glass manufacturing – Processes – With chemically reactive treatment of glass preform

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65 605, 65 6553, 65 61, C03C 2100

Patent

active

061194832

ABSTRACT:
An object of the present invention is to prevent the dhesion of particles such as fine iron powders onto a glass substrate upon the production of a glass substrate for an information recording medium. To attain the above object, any one of the following means is adopted: (1) at least one of the production, inspection, packing and filling steps of the glass substrate for an information recording medium is carried out under a clean atmosphere which does not permit the adhesion of particles; (2) at least a wall surface of a chemical reinforcement tank containing a chemical reinforcement liquid therein and/or said retaining means which is contact with the chemical reinforcement liquid is formed of a stainless alloy having corrosion resistance in a high-temperature region as high as the heating temperature of the chemical reinforcement liquid; (3) a means for trapping fine particles existing in the chemical reinforcement liquid used in the chemical reinforcement step is provided; and (4) the glass substrate is washed with hydrochloric acid.

REFERENCES:
patent: 3661545 (1972-05-01), Bartholomew
patent: 3773489 (1973-11-01), Forker, Jr. et al.
patent: 5654057 (1997-08-01), Kitayama et al.
patent: 5705273 (1998-01-01), Denry et al.

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