FRITS, GRANULES AND/OR CONCENTRATES ADDED TO FOREHEARTH TO IMPART FLUORESCENCE Russian patent published in 2020 - IPC C03C4/12 C03C3/68 C03C3/95 

FIELD: glass industry.

SUBSTANCE: present invention relates to a system of frit, granules and/or concentrates for use in glass compositions, which is capable of imparting a fluorescent effect to glass. Said systems have the following composition, wt %: 15–65 % SiO₂, 0–5 % Al₂O₃, 3–25 % B₂O₃, 5–15 % Na₂O, 0–8 % CaO, 30–65 % RE, 0–15 % Li₂O, or 15–65 % SiO₂, 0–5 % B₂O₃, 5–30 % Na₂O, 0–5 % CaO, 30–65 % RE, wherein RE is europium oxide, terbium oxide, dysprosium oxide, gadolinium oxide, samarium oxide, thulium oxide, cerium oxide or combinations thereof. Disclosed compositions are free of at least one of nickel, chromium, lead and cadmium. Fluorescent vitreous frit, granules and/or concentrate are added to the glass-melting furnace forehearth to produce fluorescent glass.

EFFECT: system provides uniform distribution of a fluorescent substance in a glass base, which enables to use it in a smaller amount.

21 cl, 6 tbl, 1 dwg, 4 ex