Chemically resistant glass

Patent metadata

Field	Value
Publication number	US-10336646-B2
Application number	US-201615273857-A
Country	US
Kind code	B2
Filing date	Sep 23, 2016
Priority date	Sep 23, 2015
Publication date	Jul 2, 2019
Grant date	Jul 2, 2019

Abstract

A glass is disclosed that is particularly suitable as pharmaceutical packing medium and as a chemically pre-stressable glass comprising at least the following components (in mol-% on oxide basis): 64-77 SiO2, 5-14 Al2O3, 4-12 Na2O, 1-12 CaO, 0-14 MgO, 0 -2 ZrO2, 0-4.5 TiO2, wherein the ratio Al2O3/Na2O≥1, wherein the ratio Al2O3/CaO≥1.5, and wherein the total content SiO2+Al2O3<82 mol-%. Preferably, a working temperature T4 of less than 1350° C. and a hydrolytic resistance according to DIN ISO 719 HGB1 and according to ISO 720 HGA are obtained.

First claim

What is claimed is:

1. A glass comprising at least the following components (given in mol-% on oxide basis):

SiO 2
64-77

Al 2 O 3
 5-14

Na 2 O
 4-12

CaO
 1-12

MgO
 0-14

ZrO 2
 0-2

TiO 2
 0-4.5;

wherein the ratio Al 2 O 3 /Na 2 O≥1 and ≤3;
wherein the ratio Al 2 O 3 /CaO≥1.5 and ≤5.2;
wherein the total content SiO 2 +Al 2 O 3 <82 mol-%;
wherein the content of K 2 O is >0.5 mol-%; and
wherein the glass has a working temperature of less than 1350° C.

2. The glass of claim 1 , which does not contain B 2 O 3 , apart from unavoidable contaminations.

3. The glass of claim 1 , wherein the content of K 2 O is a maximum of 3 mol-%.

4. The glass of claim 1 , further comprising up to 3.5 mol-% SrO.

5. The glass of claim 1 , further comprising at least 0.1 mol-% of SrO.

6. The glass of any of the preceding claims, wherein the total content SiO 2 +Al 2 O 3 +ZrO 2 <82 mol-%.

7. The glass of claim 1 , wherein the Al 2 O 3 content is at least 9 mol-%.

8. The glass of claim 1 , comprising up to 3 mol-% of Li 2 O.

9. The glass of claim 1 , which does not contain ZnO, apart from unavoidable impurities.

10. The glass of claim 1 , wherein the content of magnesium oxide is a maximum of 4 mol-%.

11. The glass of claim 1 , wherein the hydrolytic resistance according to DIN ISO 719 is HGB 1.

12. The glass of claim 1 , wherein the hydrolytic resistance according to DIN ISO 720 is HGA1.

13. The glass of claim 1 , further comprising at least 0.1 mol-% of ZrO 2 .

14. The glass of claim 1 , further comprising at least 0.1 mol-% of TiO 2 .

15. The glass of claim 1 , further comprising 0.5 mol-% to 1.5 mol-% of TiO 2 .

16. The glass of claim 1 , wherein the total content of ZrO 2 +TiO 2 is at least 0.1 mol-%.

17. The glass of claim 1 , wherein the total content of ZrO 2 +TiO 2 is a maximum of 4.5 mol-%.

18. A glass container made of a glass according to claim 1 , being chemically pre-stressed by means of ion-exchange, comprising a compressive stress layer with a layer depth of at least 10 μm and a compressive stress of at least 500 MPa.

19. A glass comprising at least the following components (given in mol-% on oxide basis):

SiO 2
64-77

Al 2 O 3
 5-14

Na 2 O
 4-12

CaO
 1-12

MgO
 0-14

ZrO 2
 0-2

TiO 2
 0-4.5;

wherein the ratio Al 2 O 3 /Na 2 O≥1 and ≤3;
wherein the ratio Al 2 O 3 /CaO≥1.5 and ≤5.2;
wherein the total content SiO 2 +Al 2 O 3 <82 mol-%; and
wherein the glass has a hydrolytic resistance according to DIN ISO 719 that is HGB 1 and/or according to DIN ISO 720 that is HGA1.

Assignees

• Schott Ag

Inventors

• Schwall Michael
• Pawlowski Edgar

Classifications

• C03C21/002

  to perform ion-exchange between alkali ions (C03C21/005 takes precedence) · CPC title

• C03C4/20

  for chemical resistant glass · CPC title

• C03C4/18

  for ion-sensitive glass · CPC title

• C03C3/087 Primary

  containing calcium oxide, e.g. common sheet or container glass · CPC title

• C03C2204/00

  Glasses, glazes or enamels with special properties · CPC title