Durable glass and glass enamel composition for glass coatings
The present invention provides glass compositions and glass coating systems for use on glass substrates in several industrial applications. It relates to a lead-free and cadmium-free glass enamel coating made primarily by utilizing at least one or more of lead-free and cadmium-free glass compositions comprising in weight percent from about 26% to about 63% SiO 2 , from about 2% to about 10.5% ZnO, from about 8% to about 20% B 2 O 3 , from about 0.1% to about 10% Bi 2 O 3 , up to about 12% Na 2 O, from about 0.1% to about 17% K 2 O, up to about 6% Li 2 O, from about 0.1% to about 22% of Ta 2 O 5 , from about 0.0% to about 22% of Nb 2 O 5 , up to about 8% from each of Al 2 O 3 , TiO 2 , ZrO 2 , BaO and SrO, from about 0.1% to about 7% Sb 2 O 3 , up to about 7% F 2 , up to about 4% from each of CaO, Mo 2 O 3 and MgO, and from about 0.1% to about 4% of one or more of La 2 O 3 , Nd 2 O 3 , Pr 2 O 3 and Ce 2 O 3 .
1. A lead-free, glass frit consisting essentially of in percent by weight from about 26% to about 63% SiO 2 , from about 2% to about 10.5% ZnO, from about 8% to about 20% B 2 O 3 , from about 0.1% to about 10% Bi 2 O 3 , up to about 12% Na 2 O, from about 0.1% to about 17% K 2 O, up to about 6% Li 2 O, from about 0.1% to about 22% of Ta 2 O 5 , from about 0% to about 22% of Nb 2 O 5 , up to about 8% of each of Al 2 O 3 , TiO 2 , ZrO 2 , BaO and SrO, from about 0.1% to about 7% Sb 2 O 3 , up to about 7% F, up to about 4% of each of CaO, Mo 2 O 3 and MgO, and from about 0.1% to about 4% of one or more of La 2 O 3 , Nd 2 O 3 , Pr 2 O 3 or Ce 2 O 3 .
2. The glass frit composition according to claim 1 consisting essentially of in percent by weight from about 28% to about 60% SiO 2 , from about 3% to about 10.5% ZnO, from about 9% to about 19% B 2 O 3 , up to about 8% Na 2 O, up to about 6% of each of BaO, SrO, Al 2 O 3 , TiO 2 and ZrO 2 , from about 0.1% to about 15% K 2 O, from about 0.1% to about 7% Bi 2 O 3 , from about 0.25% to about 4.5% Li 2 O, from about 0.1% to about 16% of each of Nb 2 O 5 and Ta 2 O 5 , up to about 5% F, from about 0.1% to about 5% Sb 2 O 3 , up to about 3% of each of CaO, Mo 2 O 3 and MgO, and from about 0.1% to about 3% of one or more of La 2 O 3 , Nd 2 O 3 , Pr 2 O 3 or Ce 2 O 3 .
3. The glass frit composition according to claim 2 consisting essentially of in percent by weight from about 30% to about 56% SiO 2 , from about 4% to about 10% ZnO, from about 10% to about 18% B 2 O 3 , from about 0.1% to about 5% of each of Na 2 O, Al 2 O 3 , TiO 2 and ZrO 2 , from about 0.25% to about 13.5% K 2 O, from about 0.25% to about 3% Bi 2 O 3 , from about 0.5% to about 3% Li 2 O, from about 0.25% to about 11% of Ta 2 O 5 , from about 0.1% to about 11% Nb 2 O 5 , up to about 4% of each of BaO and SrO, from about 0.25% to about 3.5% Sb 2 O 3 , from about 0.1% to about 3.5% F, up to about 2% of each of CaO, Mo 2 O 3 and MgO, and from about 0.25% to about 2% of one or more of La 2 O 3 , Nd 2 O 3 , Pr 2 O 3 or Ce 2 O 3 .
4. The glass frit according to claim 1 wherein the Ta 2 O 5 is present in an amount of from about 0.25% to about 11%.
5. The glass frit according to claim 1 which is substantially free of Nb 2 O 5 .
6. The glass frit according to claim 3 which is substantially free of Nb 2 O 5 .
7. The glass frit according to claim 1 wherein the Bi 2 O 3 is present in an amount of from about 0.25% to about 3%.
8. The glass frit according to claim 3 which has a coefficient of thermal expansion of from about 65×10 −7 /° C. to about 90×10 −7 /° C.
9. A glass enamel composition comprising the glass frit composition according to claim 1 .
10. A glass enamel composition comprising the glass frit composition according to claim 3 .
11. A glass enamel composition comprising the glass frit composition according to claim 4 .
12. A glass enamel composition comprising the glass frit composition according to claim 5 .
13. A glass enamel composition comprising the glass frit composition according to claim 7 .
14. A glass enamel composition comprising the glass frit composition according to claim 4 together with a vehicle selected from the group consisting of water miscible vehicle, thermoplastic vehicle, spray vehicle, roller coater vehicle, pad transfer vehicle, UV curable vehicle, and mixtures thereof.
15. A glass enamel composition comprising the glass frit composition according to claim 1 together with a vehicle selected from the group consisting of water miscible vehicle, thermoplastic vehicle, spray vehicle, roller coater vehicle, pad transfer vehicle, UV curable vehicle, and mixtures thereof.