Anisotropic glass

Patent metadata

Field	Value
Publication number	US-9758424-B2
Application number	US-201615168613-A
Country	US
Kind code	B2
Filing date	May 31, 2016
Priority date	Jun 11, 2015
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

Abstract

The present invention relates to an anisotropic glass containing, in terms of mol % on the basis of oxides, P 2 O 5 in a content of from 45 mol % to 57 mol %, two or more kinds of alkali metal oxides selected from the group consisting of Li 2 O, Na 2 O, K 2 O, Rb 2 O, and Cs 2 O in a total content of from 30 mol % to 54 mol %, and at least one polyvalent element oxide other than P 2 O 5 in a total content of from 0.1 mol % to 20 mol %, and having a birefringence of 30×10 −6 or more.

First claim

What is claimed is:

1. An anisotropic glass
comprising, in terms of mol % on the basis of oxides,
P 2 O 5 in a content of from 45 mol % to 57 mol %,
three or more alkali metal oxides selected from the group consisting of Li 2 O, Na 2 O, K 2 O, Rb 2 O, and Cs 2 O in a total content of from 30 mol % to 54 mol %, and
at least one polyvalent element oxide other than P 2 O 5 in a total content of from 0.1 mol % to 20 mol %, and

having a birefringence of 30×10 −6 or more.

2. The anisotropic glass according to claim 1 , comprising four or more alkali metal oxides selected from the group consisting of Li 2 O, Na 2 O, K 2 O, Rb 2 O, and Cs 2 O.

3. The anisotropic glass according to claim 1 , wherein the content of an alkali metal oxide having the largest content in the three or more alkali metal oxides selected from the group consisting of Li 2 O, Na 2 O, K 2 O, Rb 2 O, and Cs 2 O is taken as x 1 and the content of an alkali metal oxide having the smallest content is taken as x 2 and a molar ratio x 1 /x 2 of the contents is 2 or less.

4. The anisotropic glass according to claim 2 , comprising Na 2 O, K 2 O and Cs 2 O.

5. The anisotropic glass according to claim 1 , comprising, as the polyvalent element oxide other than P 2 O 5 , at least one selected from the group consisting of MgO, CaO, SrO, BaO, ZnO, B 2 O 3 , Al 2 O 3 , Fe 2 O 3 , and SiO 2 .

6. The anisotropic glass according to claim 5 , comprising Al 2 O 3 in a content of from 0.1 mol % to 10 mol %.

7. The anisotropic glass according to claim 3 , wherein the molar ratio x 1 /x 2 is 1.5 or less.

8. The anisotropic glass according to claim 1 , comprising, as the polyvalent element oxide other than P 2 O 5 , at least two selected from the group consisting of MgO, CaO, SrO, BaO, ZnO, B 2 O 3 , Al 2 O 3 , Fe 2 O 3 , and SiO 2 .

9. The anisotropic glass according to claim 1 , wherein the three or more alkali metal oxides are Cs 2 O, K 2 O, and Na 2 O.

10. The anisotropic glass according to claim 1 , wherein the content of P 2 O 5 is 48 mol % to 55 mol %.

11. The anisotropic glass according to claim 1 , wherein the content of P 2 O 5 is 49 mol % to 52 mol %.

12. The anisotropic glass according to claim 1 , wherein the total content of the three or more alkali metal oxides is 35 mol % to 50 mol %.

13. The anisotropic glass according to claim 1 , wherein the total content of the three or more alkali metal oxides is 40 mol % to 49 mol %.

14. The anisotropic glass according to claim 1 , wherein the total content of the polyvalent element oxide other than P 2 O 5 is 1% to 10%.

15. The anisotropic glass according to claim 1 , wherein the polyvalent element oxide other than P 2 O 5 is BaO.

16. The anisotropic glass according to claim 1 , wherein the content Al 2 O 3 is 1 mol % to 5 mol %.

Assignees

• Asahi Glass Co Ltd

Inventors

• Inaba Seiji
• Ito Setsuro

Classifications

• C03C3/16

  containing phosphorus · CPC title

• C03C3/17 Primary

  containing aluminium or beryllium · CPC title

• C03C4/20

  for chemical resistant glass · CPC title

• C03C8/24

  Fusion seal compositions being frit compositions having non-frit additions, i.e. for use as seals between dissimilar materials, e.g. glass and metal; Glass solders · CPC title