Enamel composition for glass-ceramic

Patent metadata

Field	Value
Publication number	US-9822031-B2
Application number	US-201013517425-A
Country	US
Kind code	B2
Filing date	Dec 13, 2010
Priority date	Jan 5, 2010
Publication date	Nov 21, 2017
Grant date	Nov 21, 2017

Abstract

Enamel composition, in particular intended for covering a glass pane of a fireplace insert, comprising at least one glass frit, at least one pigment in a content varying from 40 to 65% of the total weight of the enamel, preferably from 45 to 60%, and optionally at least one vehicle or medium, characterized in that the glass frit comprises the following constituents, within the limits defined below, limits included, expressed as percentages by weight of the total weight of the frit:

SiO 2
45-65% 

Al 2 O 3
0-13%

B 2 O 3
23-55% 

Na 2 O
0-10%

K 2 O
0-10%

Li 2 O
 0-10%.

First claim

The invention claimed is:

1. An enamel composition, comprising:
a glass frit;
a pigment in a content varying from 40 to 65% of the total weight of the enamel composition; and
optionally a vehicle or medium,
wherein the glass fit comprises, expressed as percentages by weight of the total weight of the glass frit:

SiO 2
45-65%; 

Al 2 O 3
0-13%;

B 2 O 3
greater than 30%; 

Na 2 O
0-10%;

K 2 O
      0-10%; and

Li 2 O
0-10%.

2. The enamel composition of claim 1 , wherein the glass frit comprises a SiO 2 content of from 47 to 57%.

3. The enamel composition of claim 1 , wherein the glass frit comprises an Al 2 O 3 content of from 2 to 8%.

4. The enamel composition of claim 1 , wherein the glass frit comprises a B 2 O 3 content of from greater than 31% to 50%.

5. The enamel composition of claim 1 , wherein the glass fit comprises an Na 2 O content of from 2.5 to 6%.

6. The enamel composition of claim 1 , wherein the glass frit comprises a K 2 O content of from 0.5 to 3%.

7. The enamel composition of claim 1 , wherein the glass frit comprises a Li 2 O content of from 2 to 6%.

8. The enamel composition of claim 1 , wherein the enamel composition does not contain at least one selected from the group consisting of ZrO 2 , BaO, MgO, CaO and SrO.

9. The enamel composition of claim 1 , wherein the glass fit consists of:

SiO 2
45-65%; 

Al 2 O 3
0-13%;

B 2 O 3
greater than 31%; 

Na 2 O
0-10%;

K 2 O
      0-10%; and

Li 2 O
0-10%.

10. The enamel composition of claim 1 , wherein the glass frit consists of:

SiO 2
47-57%; 

Al 2 O 3
3-6%;

B 2 O 3
greater than 32%; 

Na 2 O
2-5%;

K 2 O
      1-2%; and

Li 2 O
3-5%.

11. The enamel composition of claim 1 , wherein the glass frit and the pigment comprise particles having a particle size that varies from 1 to 6 microns.

12. The enamel composition of claim 1 , wherein relative contents of the glass frit and the pigment are 50% each.

13. The enamel composition of claim 1 , wherein the pigment is an opaque black pigment.

14. A screen-printing process, the process comprising applying the enamel composition of claim 1 to a glass substrate and firing, to obtain a thickness of less than or equal to 10 microns after the firing.

15. A glass-ceramic plate covered with the enamel composition of claim 1 .

16. The glass-ceramic plate of claim 15 , wherein:
the glass-ceramic plate is a fireplace insert; and
a face of the glass-ceramic plate bearing the enamel composition is suitable to be placed on the fire side.

17. The enamel composition of claim 1 , which is suitable for covering a glass pane of a fireplace insert.

18. The enamel composition of claim 1 , comprising 45 to 60% of the pigment, based on the total weight of the enamel composition.

19. The enamel composition of claim 1 , wherein the glass frit comprises an Al 2 O 3 content of 3 to 6%.

20. The enamel composition of claim 1 , wherein the glass frit consists of:

SiO 2
45-65%; 

Al 2 O 3
2-8%;

B 2 O 3
greater than 33%; 

Na 2 O
2.5-6%;  

K 2 O
 0.5-3%; and

Li 2 O
2-6%.

Assignees

• Chopinet Marie-Helene
• Hillers Maike
• Faillat Caroline
• Vilato Pablo
• Eurokera

Inventors

• Chopinet Marie-Helene
• Hillers Maike
• Faillat Caroline
• Vilato Pablo

Classifications

• C03C3/091

  containing aluminium · CPC title

• C03C3/089 Primary

  containing boron · CPC title

• C03C8/02

  Frit compositions, i.e. in a powdered or comminuted form · CPC title

• C03C8/14

  Glass frit mixtures having non-frit additions, e.g. opacifiers, colorants, mill-additions · CPC title

• C03C17/04

  by fritting glass powder · CPC title