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AssigneeSchott AG
InventorsJoerg Fechner, Franz Ott, Brigitte Hueber
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Glass for gas discharge tubes, which are used in fluorescent lamps, EEFL lamps, LCD displays, computer monitors, telephone displays and TFT displays, and a process for making it are described. The glass contains, in % by weight based on oxide content: SiO2, 60-75; B2O3, >25-35; Al2O3, 0-10; Li2O, 0-10; Na2O, 0-20; K2O, 0-20; MgO, 0-8; CaO, 0-20; SrO, 0-5; BaO, 0-5; ZnO, 0-3; ZrO2, 0-5; TiO2, 0-10; Fe2O3, 0-0.5; CeO2 0-0.5; MnO2, 0-1.0; Nd2O3, 0-1.0; WO3, 0-2; Bi2O3, 0-5; MoO3, 0-5; As2O3, 0-1; Sb2O3, 0-1; SO42−, 0-2; Cl-, 0-2 and F−, 0-2, wherein ΣLi2O+Na2O+K2O=0-25% by weight; ΣMgO+CaO+SrO+BaO=0-20; ΣFe2O3+CeO2+TiO2+PbO+As2O3+Sb2O3 is at least 0-10; and ΣPdO+PtO3+PtO2+PtO+RhO2+Rh2O3+IrO2+Ir2O3 is from 0.00001-0.1.
A process for making a UV-absorbing glass, especially for a fluorescent lamp, said process comprising preparing a glass melt, said glass melt having a composition, in % by weight on an oxide basis of:
A UV-absorbing glass made by a process comprising preparing a glass melt, said glass melt having a composition, in % by weight on an oxide basis of:
A gas discharge lamp made with a UV-absorbing glass, wherein said UV-absorbing glass is made by a process, said process comprising preparing a glass melt, said glass melt having a composition, in % by weight on an oxide basis of:
Dependencies are inferred from the claim text.