Method for preserving polished inorganic glass and method for preserving article obtained by using the same

• US 5,853,662 A
• Filed: 04/17/1996
• Issued: 12/29/1998
• Est. Priority Date: 04/17/1996
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Gas Chemical Company Incorporated (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Gas Chemical Company Incorporated (Mitsubishi Electric Corporation)
• Inventors: Watanabe, Takayuki
• Primary Examiner(s): JASTRZAB, KRISANNE MARIE
• Application Number:
  US08/634,061
• Time in Patent Office: 986 Days
• Field of Search: 422/1, 422/40, 252/387, 252/397
• US Class Current: 422/40
• CPC Class Codes: B65D 81/24 Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants with thermal insulation B65D81/38
• CPC Class Codes: B65D 81/266 for absorbing gases, e.g. oxygen absorbers or desiccants B65D51/244, B65D51/30 take precedence
• CPC Class Codes: B65D 85/38 for delicate optical, measuring, calculating or control apparatus

Abstract

Disclosed is a method for preserving a polished inorganic glass or an article obtained by using the same by enclosing the polished inorganic glass or the article obtained by using the same in a container having a gas barrier property, and then, sealing the container to remove substantially both oxygen and moisture from the container.

Claims

1. A compact and easy method for preserving a polished inorganic glass which comprises:

enclosing a polished inorganic glass in a container having a gas barrier property with an oxygen permeability of 10 ml/² •

Day•

atm or below at 25°

C. at 60% RH and a water vapor permeability of 1 g/m² •

Day or below at 40°

C. at 90% RH together with an oxygen absorbent requiring no moisture for absorption of oxygen and a drying agent, and

then, sealing the container to remove substantially both oxygen and moisture from the container, thereby preventing weathering of the polished glass.

2. The method for preserving according to claim 1, wherein the polished inorganic glass is enclosed together with an oxygen absorbent requiring no moisture for absorption of oxygen, a drying agent and an acidic gas absorbent.

3. The method for preserving according to claim 1, wherein the oxygen absorbent contains at least one compound selected from the group consisting of unsaturated fatty acid compounds, linear hydrocarbon polymers having an unsaturated group(s) and thermoplastic polymers as the main ingredient and a substance to promote oxygen absorption.

4. The method for preserving according to claim 1, wherein the interior of the container is maintained at an oxygen concentration of 5% or below and a relative humidity of 10% or below.

5. The method for preserving according to claim 3, wherein the oxygen absorbent further contains a carrier substance.

6. The method for preserving according to claim 1, wherein the oxygen absorbent, the drying agent, or a mixture of the oxygen absorbent and the drying agent is covered with a gas-permeable packing material to form a parcel.

7. The method for preserving according to claim 6, wherein the parcel is further covered with a material releasing no dust to form a double-packed parcel.

8. The method for preserving according to claim 1, wherein the polished inorganic glass is a glass substrate.

9. The method for preserving according to claim 1, wherein the polished inorganic glass is an optical glass.

10. A compact and easy method for preserving an article obtained by using a polished inorganic glass which comprises:

enclosing an article obtained by using a polished inorganic glass in a container having a gas barrier property with an oxygen permeability of 10 ml/m² •

Day•

atm or below at 25°

C. at 60% RH and a water vapor permeability of 1 g/m² •

Day or below at 40°

C. at 90% RH together with an oxygen absorbent requiring no moisture for absorption of oxygen and a drying agent, and

then, sealing the container to remove substantially both oxygen and moisture from the container, thereby preventing weathering of the polished glass.

11. The method for preserving according to claim 10, wherein the article obtained by using a polished inorganic glass is enclosed together with an oxygen absorbent requiring no moisture for absorption of oxygen, a drying agent and an acidic gas absorbent.

12. The method for preserving according to claim 10, wherein the oxygen absorbent contains at least one compound selected from the group consisting of unsaturated fatty acid compounds, linear hydrocarbon polymers having an unsaturated group(s) and thermoplastic polymers as the main ingredient and a substance to promote oxygen absorption.

13. The method for preserving according to claim 10, wherein the interior of the container is maintained at an oxygen concentration of 5% or below and a relative humidity of 10% or below.

14. The method for preserving according to claim 12, wherein the oxygen absorbent further contains a carrier substance.

15. The method for preserving according to claim 10, wherein the oxygen absorbent, the drying agent, or a mixture of the oxygen absorbent and the drying agent is covered with a gas-permeable packing material to form a parcel.

16. The method for preserving according to claim 15, wherein the parcel is further covered with a material releasing no dust to form a double-packed parcel.

17. The method for preserving according to claim 10, wherein the article obtained by using a polished inorganic glass is composed of an optical glass.

18. The method for preserving according to claim 10, wherein the article obtained by using a polished inorganic glass is composed of a glass substrate.

19. The method for preserving according to claim 18, wherein the glass substrate is a master board of an optical disk.

20. The method for preserving according to claim 18, wherein the glass substrate is an optical disk substrate.

21. The method for preserving according to claim 10, wherein the the article obtained by using a polished inorganic glass is an optical instrument.

22. The method for preserving according to claim 21, wherein the the optical instrument is one member selected from the group consisting of cameras, microscopes, telescopes, copying machines and laser printers.