Glass ceramic with SiO2 as the main crystalline phase

Patent metadata

Field	Value
Publication number	US-10377661-B2
Application number	US-201515310823-A
Country	US
Kind code	B2
Filing date	May 15, 2015
Priority date	May 16, 2014
Publication date	Aug 13, 2019
Grant date	Aug 13, 2019

Abstract

Glass ceramics having SiO 2 as main crystal phase and precursors thereof are described which are characterized by very good mechanical and optical properties and in particular can be used as restoration material in dentistry.

First claim

The invention claimed is:

1. Glass ceramic, which comprises the following components

Component
wt. %

SiO 2
58.0 to 92.0

Li 2 O
 2.0 to 10.0

Al 2 O 3
  0 to 10.0

and comprises SiO 2 as main crystal phase and comprises 5.0 to 50.0 wt.-% SiO 2 as crystal phase.

2. Glass ceramic according to claim 1 , which comprises 60.0 to 90.0 wt.-% SiO 2 .

3. Glass ceramic according to claim 1 , which comprises 2.8 to 9.0 wt.-% Li 2 O.

4. Glass ceramic according to claim 1 , which comprises 0 to 13.0 further alkali metal oxide Me I 2 O.

5. Glass ceramic according to claim 1 , which comprises 0 to 11.0 wt.-% oxide of divalent elements Me II O.

6. Glass ceramic according to claim 1 , which comprises 0 to 10.0 wt.-% oxide of trivalent elements Me III 2 O 3 .

7. Glass ceramic according to claim 1 , which comprises 0 to 21.0 wt.-% further oxide of tetravalent elements Me IV O 2 .

8. Glass ceramic according to claim 1 , which comprises 0 to 7.0 wt.-% P 2 O 5 .

9. Glass ceramic according to claim 1 , which comprises 0 to 6.0 wt.-% further oxide of pentavalent elements Me V 2 O 5 .

10. Glass ceramic according to claim 1 , which comprises 0 to 6.0 wt.-% oxide of hexavalent elements Me VI O 3 .

11. Glass ceramic according to claim 1 , which comprises 0 to 5.0 wt.-% fluorine.

12. Glass ceramic according to claim 1 , which comprises at least one of the following components in the specified amounts:

Component
wt.-%

SiO 2
58.0 to 92.0  

Li 2 O
2.0 to 10.0 

Me I 2 O
 0 to 13.0

Me II O
 0 to 11.0

Me III 2 O 3
 0 to 10.0

Me IV O 2
 0 to 21.0

P 2 O 5
0 to 7.0

Me V 2 O 5
0 to 6.0

Me VI O 3
0 to 6.0

fluorine
 0 to 5.0.

13. Glass ceramic according to claim 1 , which comprises low quartz, cristobalite or a mixture thereof as main crystal phase.

14. Glass ceramic according to claim 1 , which comprises lithium phosphate and/or lithium silicate as further crystal phase.

15. Glass ceramic according to claim 1 , wherein the glass ceramic is present in the form of a powder, a frit, a blank or a dental restoration.

16. Glass ceramic according to claim 13 , which comprises low quartz as main crystal phase.

17. Glass ceramic according to claim 1 , which comprises 10.0 to 30.0 wt.-% SiO 2 as crystal phase.

18. Glass ceramic according to claim 4 , wherein Me I 2 O is selected from Na 2 O, K 2 O, Rb 2 O and/or Cs 2 O.

19. Glass ceramic according to claim 5 , wherein Me II O is selected from MgO, CaO, SrO and/or ZnO.

20. Glass ceramic according to claim 6 , wherein Me 111 2 0 3 is selected from Al 2 O 3 , B 2 O 3 , Y 2 O 3 , La 2 O 3 , Ga 2 O 3 and/or In 2 O 3 .

21. Glass ceramic according to claim 7 , wherein Me IV O 2 is selected from ZrO 2 , GeO 2 , CeO 2 , TiO 2 and/or SnO 2 .

22. Glass ceramic according to claim 9 , wherein Me V 2 O 5 is selected from V 2 O 5 , Ta 2 O 5 and/or Nb 2 O 5 .

23. Glass ceramic according to claim 10 , wherein Me VI O 3 is selected from WO 3 and/or MoO 3 .

24. Glass ceramic according to claim 1 , which comprises at least one of the following components in the specified amounts:

Component
wt. %

SiO 2
70.0 to 83.0

Li 2 O
5.0 to 9.0

Me I 2 O
 1.0 to 13.0

Me II O
1.0 to 7.0

Me III 2 O 3
2.0 to 9.0

Me IV O 2
  0 to 21.0

P 2 O 5
1.0 to 6.5

Me V 2 O 5
  0 to 5.0

Me VI O 3
  0 to 6.0

fluorine
   0 to 1.0.

25. Glass ceramic according to claim 1 , which comprises 5.0 to 50.0 wt.-% low quartz, cristobalite or mixtures thereof as crystal phase.

26. Method for the preparation of the glass ceramic according to claim 1 , comprising subjecting a starting glass comprising 58.0 to 92.0 wt.-% SiO 2 , 2.0 to 10

Assignees

• Ivoclar Vivadent Ag

Inventors

• Rampf Markus
• Dittmer Marc
• Ritzberger Christian
• Schweiger Marcel
• Höland Wolfram

Classifications

• A61K6/833

  Glass-ceramic composites · CPC title

• A61K6/836

  Glass · CPC title

• C03C10/0009 Primary

  containing silica as main constituent · CPC title

• C03C4/0021

  for dental use · CPC title

• C03B32/02

  Thermal crystallisation, e.g. for crystallising glass bodies into glass-ceramic articles {(C03B27/012 takes precedence)} · CPC title