| 摘要 |
PCT No. PCT/US96/19723 Sec. 371 Date Apr. 14, 1998 Sec. 102(e) Date Apr. 14, 1998 PCT Filed Dec. 11, 1996 PCT Pub. No. WO97/23422 PCT Pub. Date Jul. 3, 1997The invention relates to brown glasses which absorb ultraviolet radiation that are used in the production of ophthalmic sun glasses, and that have the following composition, expressed in wt. %: - SiO2 59-78 - Al2O3 2-6 - B2O3 0-3 - Na2O 7-16 - K2O 2-9 - CaO 0-7 - BaO 0-12 - ZnO 0-12 - ZrO2 0-6 - TiO2 0-6 - MnO2 0.25-6 - V2O5 1-3 - Fe2O3 0-1.5 - NiO 0-0.5 - CoO 0-0.1 - Sb2O3 0-0.7 - As2O3 0-0.7 - F 0.05-1.0 - With MnO2 + Fe2O3 + V2O5 >1.5 - Al2O3 + SiO2 >/=65. -
|
