Forehearth Frits, Pearls And/Or Concentrates For Fluorescence
AssigneeFerro Corporation
InventorsYasin Musa Mehmet Duman, Stéphane François Yves Bodin, Benoit Darbouret
Life of this patent
Estimating the term…
Abstract
The present invention relates to the field of forehearth fits, pearls, and/or concentrates for use in glass compositions. In particular, the present invention provides a system of forehearth frits, pearls, and/or concentrates that is capable of parting a fluorescent effect to a glass composition by adding a fluorescent glass fit, pearl or concentrate in the forehearth of a glass furnace, to form fluorescent glass and a method of using the fluorescent system of forehearth fits, pearls, and/or concentrates.
Claims21
A fluorescent glass frit, pearl, or concentrate comprising at least one 15-65 wt % glass-forming metal oxide, and at least one metal compound selected from the group consisting of
- europium compound,
- samarium compound,
- dysprosium compound,
- copper and tin compound,
- terbium compound,
- cerium compound,
- dysprosium and cerium compound,
- samarium and cerium compound, and
- combinations of the foregoing;
- and
- wherein the fluorescent glass frit, pearl, or concentrate is devoid of at least one of nickel, chromium, lead and cadmium.
A fluorescent glass frit, pearl, or concentrate comprising in weight %:
- from about 30 to about 50% of a metal compound other than compounds including silicon, boron, alkalis, beryllium, magnesium, strontium, barium and radium,
- from about 25 to about 55% SiO2,
- from about 0.1 to about 5% B2O3,
- from about 10 to about 25% Na2O,
- from about 0.1 to about 3% CaO, and
- no nickel, no chromium, no lead and no cadmium.
(canceled)
A method for imparting a fluorescent effect to a molten base glass in the forehearth of a glass furnace comprising the steps of:
- a. forming a fluorescent glass frit, pearl, or concentrate, which comprises:
- from about 30 to about 50 wt % of a metal compound other than silicon, boron, alkalis, beryllium, magnesium, strontium, barium and radium,
- from about 25 to about 55 wt % SiO2,
- from about 0.1 to about 5 wt % B2O3,
- from about 10 to about 25 wt % Na2O,
- from about 0.1 to about 3 wt % CaO,
- no nickel, no chromium, no lead and no cadmium;
- b. combining the fluorescent frit, pearl, or concentrate with the molten base glass contained in a forehearth so as to impart a fluorescent effect to the molten base glass;
- and
- c. cooling the molten base glass to form a fluorescent glass composition.
(canceled)
Dependencies are inferred from the claim text.