Inkjet printable inks for fabricating enamel coatings

3:

• The inkjet printable enamel ink according to claim 1,
• wherein the quantity of the crystalline bismuth silicate powder in the ink is:
• at least 0.05 wt %, 0.08 wt %, or 0.1 wt %;
• no more than 5 wt %, 2 wt %, 1 wt %, 0.5 wt %, or 0.2 wt %;
• or within a range defined by any combination of the aforementioned lower and upper limits.

4:

• The inkjet printable enamel ink according to claim 1,
• wherein the viscosity of the ink is:
• no more than 28, 25, or 20 mPa·S−1 at 100 s−1 shear rate and a temperature of 35° C.;
• no less than 5, 7, or 10 mPa·S−1 at 100 s−1 shear rate and a temperature of 35° C.;
• or within a range defined by any combination of the aforementioned upper and lower limits.

5:

• The inkjet printable enamel ink according to claim 1,
• wherein the total solid content of the ink is:
• no more than 58 wt %, 57 wt %, or 55 wt %;
• no less than 30 wt %, 35 wt %, 40 wt %, or 45 wt %;
• or within a range defined by any combination of the aforementioned upper and lower limits.

9:

• The inkjet printable enamel ink according to claim 8, wherein the first glass frit comprises:
• >15 to ≤50 wt % SiO2;
• ≥40 to ≤80 wt % Bi2O3;
• ≥0 to ≤5 wt % ZnO;
• ≥0 to ≤5 wt % Li2O;
• ≥0 to ≤5 wt % F;
• ≥0 to ≤5 wt % Na2O;
• ≥0 to ≤5 wt % CuO;
• ≥0 to ≤5 wt % Al2O3;
• ≥0 to ≤5 wt % MnO;
• and
• ≥0 to ≤5 wt % Fe2O3.

11:

• The inkjet printable enamel ink according to claim 8, wherein the second glass frit comprises:
• ≥40 to ≤70 wt % Bi2O3;
• >5 to ≤25 wt % B2O3;
• ≥5 to ≤25 wt % ZnO;
• ≥0 to ≤25 wt % SnO2.

13:

• The inkjet printable enamel ink according to claim 8, wherein the ink comprises:
• 10 to 30 wt % of the first glass frit;
• 10 to 30 wt % of the second glass frit;
• 0.05 to 5 wt % of the crystalline bismuth silicate powder;
• 10 to 20 wt % of the pigment;
• and
• 40 to 60 wt % of the organic carrier.

15:

• A method of forming an enamel coating on a substrate, the method comprising:
• depositing a coating of the ink as claimed in any preceding claim onto a substrate using a digital inkjet printer;
• and
• firing the coating to form an enamel coating.

18:

• A glass frit composition suitable for use in the inkjet printable enamel ink according to claim 1, wherein the glass frit composition comprises:
• >15 to ≤50 wt % SiO2;
• ≥40 to ≤80 wt % Bi2O3;
• ≥0 to ≤5 wt % ZnO, optionally >0;
• ≥0 to ≤5 wt % Li2O, optionally >0;
• ≥0 to ≤5 wt % F, optionally >0;
• ≥0 to ≤5 wt % Na2O, optionally >0;
• ≥0 to ≤5 wt % CuO, optionally >0;
• ≥0 to ≤5 wt % Al2O3, optionally >0;
• ≥0 to ≤5 wt % MnO, optionally >0;
• and
• ≥0 to ≤5 wt % Fe2O3, optionally >0.

19:

• The inkjet printable enamel ink according to claim 2,
• wherein the quantity of the crystalline bismuth silicate powder in the ink is:
• at least 0.05 wt %, 0.08 wt %, or 0.1 wt %;
• no more than 5 wt %, 2 wt %, 1 wt %, 0.5 wt %, or 0.2 wt %;
• or within a range defined by any combination of the aforementioned lower and upper limits.