The present invention provides a composition for use in forming an enamel cover coat from which baked-on foods can be removed without the need for pyrolysis or highly alkaline cleaners. The enamel cover coat preferably exhibits no chipping or other surface defects subsequent to a 2.0 mm Plum Jam Tes
The present invention provides a composition for use in forming an enamel cover coat from which baked-on foods can be removed without the need for pyrolysis or highly alkaline cleaners. The enamel cover coat preferably exhibits no chipping or other surface defects subsequent to a 2.0 mm Plum Jam Test and an acid resistance of A or better according to ISO 2722. The composition according to the invention includes a glass component including at least a first glass frit comprising a low SiO2 glass frit. Preferably, the glass component includes a blend of the first glass frit and at least a second glass frit. Preferably, the first glass frit includes by weight from about 30% to about 45% P2O5, from about 20% to about 40% Al2O3, from about 15% to about 35% Li2O+ Na2O+K2O, up to about 15% B2O3, up to about 15% MgO+CaO+SrO+BaO+ZnO, up to about 10% TiO2+ZrO2 , and up to about 10% SiO2.
대표청구항▼
What is claimed: 1. A composition for use in forming an enamel cover coat from which baked-on foods can be removed without the need for pyrolysis or highly alkaline cleaners, said composition comprising a glass component comprising at least a first glass frit, said first glass frit comprising by we
What is claimed: 1. A composition for use in forming an enamel cover coat from which baked-on foods can be removed without the need for pyrolysis or highly alkaline cleaners, said composition comprising a glass component comprising at least a first glass frit, said first glass frit comprising by weight from about 35.57% to about 39.57% P2O 5, from about 30.00% to about 34.00% Al2O3, from about 10. 00% to about 14.00% K2O, from about 10.00% to about 13.00% Na 2 O, from about 2.00% to about 5.00% B2O3, up to about 3.00% ZnO, up to about 3.00% TiO2, and up to about 1.00% SiO2. 2. The composition according to claim 1 wherein said glass component comprises a blend of at least said first glass frit and a second glass frit. 3. The composition according to claim 2 wherein said enamel cover coat exhibits no chipping or other surface defects subsequent to a 2.0 mm Plum Jam Test. 4. The composition according to claim 3 wherein said enamel cover coat has an acid resistance of A or better according to ISO 2722. 5. The composition according to claim 3 wherein said first glass frit comprises by weight from about 20% to about 35% Li2O+ Na2O+K2O, up to about 15% MgO+CaO+SrO+ BaO+ZnO, and up to about 10% TiO2+ZrO2. 6. The composition according to claim 5 wherein said first glass frit further comprises by weight up to about 10% MnO+CoO+NiO+CuO+ Fe2O3CrO3+MoO3+WO3. 7. The composition according to claim 5 wherein said first glass frit comprises by weight from about 20% to about 30% Li2O+ Na2O+K20, up to about 7% MgO+CaO+SrO+BaO+ZnO, and up to about 7% TiO2+ZrO2. 8. A composition according to claim 5 for use in forming an enamel cover coat from which baked-on foods can be removed without the need for pyrolysis or highly alkaline cleaners, said composition comprising a glass component comprising a blend of at least a first glass fnit and a second glass frit, wherein said first glass frit comprises by weight from about 35.57% to about 39.57% P2O5, from about 30.00% to about 34.00% Al2O3, from about 10.00% to about 14.00% K 2O, from about 10.00% to about 13.00% Na 2O, from about 20% to about 30% Li2O+Na2O+K 2O, from about 2.00% to about 5. 00% B2O3, up to about 3.00% ZnO, up to about 7% MgO+CaO+SrO+BaO+ZnO, up to about 3.00% TiO2, up to about 7% TiO2+ZrO2, and up to about 1.00% SiO2, and wherein said enamel cover coat exhibits no chipping or other surface defects subsequent to a 2.0 mm Plum Jam Test. 9. The composition according to claim 8 wherein said first glass frit comprises by weight about 37.25% P2O5, about 31.67% Al2O3, about 12. 42% K2O, about 11.16% Na2O, about 3.78% B2O 3, about 1.96% TiO 2, about 1.76% ZnO, and about 0.00% SiO2. 10. The composition according to claim 3 wherein said first glass frit comprises from about 20% to about 90% by weight of said glass component. 11. The composition according to claim 3 wherein said first glass frit comprises from about 50% to about 75% by weight of said glass component. 12. The composition according to claim 3 further comprising up to about 20% by weight of one or more mill additions. 13. The composition according to claim 12 wherein at least one of said mill additions is selected from the group consisting of clay, bentonite, magnesium carbonate, potassium nitrate, sodium aluminate, boric acid, and pigments. 14. A method of forming an enamel cover coat from which baked-on foods can be removed without the need for pyrolysis or highly alkaline cleaners, said method comprising: providing a substrate; providing a composition comprising a glass component, said glass component comprising at least a first glass frit, said first glass frit comprising by weight from about 35.57% to about 39.57% P2O5, from about 30. 00% to about 34.00% Al2O3, from about 10.00% to about 14.00% K2O, from about 10.00% to about 13.00% Na2O, from about 2.00% to about 5.00% B2O3, up to about 3.00% ZnO, up to about 3.00% TiO2, and up to about 1.00% SiO2; applying said composition to said substrate; and firing said composition to form said enamel cover coat. 15. The method according to claim 14 wherein said glass component comprises a blend of at least said first glass frit and a second glass frit. 16. The method according to claim 15 wherein said enamel cover coat exhibits no chipping or other surface defects subsequent to a 2.0 mm Plum Jam Test. 17. The method according to claim 16 wherein said first glass fit comprises by weight from about 20% to about 35% Li2O+Na 2O+K2O, up to about 15% MgO+CaO+SrO+ BaO+ZnO, and up to about 10% TiO2+ZrO2. 18. The method according to claim 16 wherein said substrate comprises pickled nickel-coated steel, fired enamel ground coated steel, or unfired enamel ground coated steel. 19. An article having at least one surface coated with an enamel cover coat from which baked-on foods can be removed without the need for pyrolysis or highly alkaline cleaners, said enamel cover coat having been formed by applying a composition to said surface of said article and then firing said composition, said composition comprising a glass component comprising at least a first glass frit, said first glass frit comprising by weight from about 35.57% to about 39.57% P2 O 5, from about 30.00% to about 34.00% Al2O3, from about 10. 00% to about 14.00% K2O, from about 10.00% to about 13.00% Na2 O, from about 2.00% to about 5.00% B2 O3, up to about 3. 00% ZnO, up to about 3.00% TiO2, and up to about 1.00% SiO2.
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이 특허에 인용된 특허 (2)
Faust ; William D., Volatilizable frit composition forming oxidation-inhibiting vapors.
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