Method for packing quartz glass cloth

Patent metadata

Field	Value
Publication number	US-12116304-B2
Application number	US-202318573215-A
Country	US
Kind code	B2
Filing date	Nov 28, 2023
Priority date	Dec 23, 2022
Publication date	Oct 15, 2024
Grant date	Oct 15, 2024

Abstract

A method for packing quartz glass cloth includes the step of packing quartz glass cloth that is at least 99.5 wt % comprised of SiO2 with packaging film to form a package, wherein the package has a volumetric absolute humidity therein of 10.0 g/m3 or less.

First claim

The invention claimed is:

1. A method for packing quartz glass cloth, comprising the step of packing quartz glass cloth that is at least 99.5 wt % comprised of SiO 2 with packaging film to form a package, wherein the package has a volumetric absolute humidity therein of 10.0 g/m 3 or less.

2. The packing method of claim 1 , wherein the package has a volumetric absolute humidity therein of 5.0 g/m 3 or less.

3. The packing method of claim 1 , wherein the packaging film has a water vapor transmission rate at 40° C. and 90% RH of 20 g/(m 2 ·day) or less.

4. The packing method of claim 1 , wherein the packaging film is a film selected from the group consisting of films made of an organic resin such as polyethylene, polypropylene, polyester, nylon (PA), ethylene-vinyl alcohol copolymer or vinylidene chloride, organic resin multilayer films and metallized films.

5. The packing method of claim 1 , wherein a desiccant is included within the packaging film.

6. The packing method of claim 5 , wherein the desiccant has a maximum moisture absorption at 90% relative humidity of 20 wt % or more.

7. The packing method of claim 5 , wherein the desiccant is selected from the group consisting of silica gel, bentonite, zeolite, calcium chloride, calcium oxide and phosphorus pentoxide.

8. The packing method of claim 1 , wherein the volumetric absolute humidity within the packaging film at packing onset is 10.0 g/m 3 or less.

9. The packing method of claim 8 , wherein the volumetric absolute humidity within the packaging film at packing onset is 5.0 g/m 3 or less.

10. The packing method of claim 1 , wherein the package contains a gas which is dry air.

11. The packing method of claim 1 , wherein the package contains a gas which is an inert gas.

12. The packing method of claim 1 wherein the quartz glass cloth, when removed from the package after being packaged for a period of from 1 day to 3 years, has a dielectric loss tangent at 10 GHz of 0.0005 or less.

13. The packing method of claim 1 , wherein the quartz glass cloth that is at least 99.5 wt % comprised of SiO 2 is a silane coupling agent-treated quartz glass cloth that is at least 99.5 wt % comprised of SiO 2 .

14. A method for packing quartz glass cloth, comprising the step of packing quartz glass cloth that is at least 99.5 wt % comprised of SiO 2 with packaging film to form a package, wherein the package has a volumetric absolute humidity therein within 5 minutes just prior to opening of the package, as measured by including a battery-operated thermometer/hygrometer within the packaging film, which is 9.8 g/m 3 or less.

15. The packing method of claim 14 , wherein the packaging film has a water vapor transmission rate at 40° C. and 90% RH of 20 g/(m 2 ·day) or less.

16. The packing method of claim 14 , wherein the packaging film is a film selected from the group consisting of films made of an organic resin such as polyethylene, polypropylene, polyester, nylon (PA), ethylene-vinyl alcohol copolymer or vinylidene chloride, organic resin multilayer films and metallized films.

17. The packing method of claim 14 , wherein a desiccant is included within the packaging film.

18. The packing method of claim 17 , wherein the desiccant has a maximum moisture absorption at 90% relative humidity of 20 wt % or more.

19. The packing method of claim 17 , wherein the desiccant is selected from the group consisting of silica gel, bentonite, zeolite, calcium chloride, calcium oxide and phosphorus pentoxide.

20. The packing method of claim 14 , wherein the volumetric absolute humidity within the packaging film at packing onset is 10.0 g/m 3 or less.

21. The packing method of claim 20 , wherein the volumetric absolute humidity within the packaging film at packing onset is 5.0 g/m 3 or less.

22. The packing method of claim 14 , wherein the package contains a gas which is dry air.

23. The packing method of claim 14 , wherein the package contains a gas which is an inert gas.

24. The packing method of claim 14 wherein the quartz glass cloth, when removed from the package after being packaged for a period of from 1 day to 3 years, has a dielectric loss tangent at 10 GHz of 0.0005 or less.

25. The packing method of claim 14 , wherein the quartz glass cloth that is at least 99.5 wt % comprised of SiO 2 is a silane coupling agent-treated quartz glass cloth that is at least 99.5 wt % comprised of SiO 2 .

26. A method for packing quartz glass cloth, comprising the step of packing quartz glass cloth that is at least 99.5 wt % comprised of SiO 2 with packaging film to form a package, wherein the packaging film has a water vapor transmission rate at 40° C. and 90% RH of 20 g/(m 2 ·day) or less and includes therein a desiccant.

27. The packing method of claim 26 wherein the quartz glass cloth, when removed from the package after being packaged for a period of from 1 day to 3 years, has a dielectric loss tangent at 10 GHz of 0.0005 or less.

28. The packing method of claim 26 , wherein the quartz glass cloth that is at least 99.5 wt % comprised of SiO 2 is a silane coupling agent-treated quartz glass cloth that is at least 99.5 wt % comprised of SiO 2 .

Assignees

• Shinetsu Chemical Co

Inventors

• Shiobara Toshio
• Itokawa Hajime
• Nomura Ryunosuke

Classifications

• C03C3/06

  with more than 90% silica by weight, e.g. quartz {(C03C3/045 takes precedence)} · CPC title

• C03B2201/02

  Pure silica glass, e.g. pure fused quartz · CPC title

• B65D81/266

  for absorbing gases, e.g. oxygen absorbers or desiccants (B65D51/244, B65D51/30 take precedence) · CPC title

• B65D81/2084

  in a flexible container · CPC title

• B65D81/2069

  in a special atmosphere · CPC title