Method for producing a glass article

Patent metadata

Field	Value
Publication number	US-11292744-B2
Application number	US-202016886886-A
Country	US
Kind code	B2
Filing date	May 29, 2020
Priority date	Nov 30, 2017
Publication date	Apr 5, 2022
Grant date	Apr 5, 2022

Abstract

A process for producing a glass article is provided that includes, in order, a first process step in which a surface of the glass article has a temperature of at least 400° C. for at least some of the time, a second process step in which the surface of the glass article has a temperature of more than 10° C. and less than 100° C. and the surface is brought into contact with water or water vapor and the surface of the glass article is supplied with an amount of water which corresponds to a water layer thickness of from 1 to 100 μm, and a third process step in which the glass article is processed further with contact of the surface with foreign materials or other glass articles.

First claim

What is claimed is:

1. A process for producing a glass article, comprising, in this order:
a first process step in which a surface of the glass article has a temperature of at least 400° C. for at least some of the time;
a second process step in which the surface of the glass article has a temperature of more than 5° C. and less than 100° C. and the surface is brought into contact with water or water vapor and the surface of the glass article is supplied with an amount of the water or water vapor that corresponds to a water layer thickness of from 1 to 100 μm; and
a third process step in which the glass article is processed further with contact of the surface with foreign materials or other glass articles,
wherein the surface has a coefficient of sliding friction before the second process step has a first value (μ 1 ) and has a second value (μ 2 ) directly after the second process where (μ 1 −μ 2 )/μ 1 >0.1.

2. The process of claim 1 , wherein the surface of the glass article has a temperature of less than 60° C. in the second process step.

3. The process of claim 1 , wherein the second process step is carried out for a period of time of less than 60 s.

4. The process of claim 1 , wherein the second process step is carried out for a period of time of less than 10 s.

5. The process of claim 1 , wherein the third process step is carried out within 4 hours after conclusion of the second process step.

6. The process of claim 1 , wherein the third process step is carried out within 1 hour after conclusion of the second process step.

7. The process of claim 1 , where (μ 1 −μ 2 )/μ 1 >0.3.

8. The process of claim 1 , wherein, after the second process step, chemical change induced in the glass article is limited to a surface layer having a thickness of <50 nm.

9. The process of claim 1 , wherein, after the second process step, chemical change induced in the glass article is limited to a surface layer having a thickness of <10 nm.

10. The process of claim 1 , wherein the second process step does not lead to chemical changes in a layer of the glass article that is located deeper down and extends from a distance of 50 nm underneath the surface of the glass article.

11. The process of claim 1 , wherein the second process step induces reversible changes in the surface, the process further comprising reversing the reversible changes in the surface by heat treatment at 400° C.

12. The process of claim 1 , wherein the second process step consists of contacting the surface with the water or water vapor.

13. The process of claim 12 , wherein the water or water vapor consists of distilled water or water for injection.

14. The process of claim 1 , wherein the water layer thickness is from 5 to 50 μm.

15. The process of claim 1 , wherein the bringing of the surface into contact with the water or water vapor of the second process step comprises spraying-on humid air that has a higher temperature than the glass article.

16. The process of claim 1 , wherein the bringing of the surface into contact with the water or water vapor of the second process step comprises contacting with atomized water.

17. The process of claim 1 , wherein the glass article is a hollow body comprising a glass selected from a group consisting of: a type I borosilicate glass according to the European Pharmacopeia 8.4, section 3.2.1; a type II borosilicate glass according to the European Pharmacopeia 8.4, section 3.2.1; and an aluminosilicate glass that has an Al 2 O 3 content in the range from 8 to 23% by weight.

18. The process of claim 1 , wherein the glass article is a pharmaceutical primary packaging selected from a group consisting of a vial, a syringe, a cartridge, and an ampoule.

19. The process of claim 1 , wherein the foreign materials or other glass articles are materials selected from a group consisting of metal, glass, polymers, and ceramics.

20. The process of claim 1 , wherein the first value (μ 1 ) is less than 0.7 and the second value (μ 2 ) is greater than 0.5.

Assignees

• Schott Ag

Inventors

• Glacki Alexander
• Henze Inka
• Moseler Doris
• Stohr Ulrike
• Brack Heike

Classifications

• C03C21/006

  to perform an exchange of the type Xn+ ----> nH+ · CPC title

• C03C23/007 Primary

  by thermal treatment · CPC title

• C03C23/008 Primary

  comprising a lixiviation step · CPC title