Brown glass which absorbs ultraviolet radiation

Details Brown glass which absorbs ultraviolet radiation Brown glass which absorbs ultraviolet radiation

C - Chemistry, Metallurgy

03

C

C03C 3/083 (2006.01) C03C 3/091 (2006.01) C03C 3/112 (2006.01) C03C 4/02 (2006.01) C03C 4/08 (2006.01)

Patent

CA 2239363

The invention relates to brown glasses which absorb ultraviolet radiation, characterized by the fact that they have the following composition, expressed in wt.% based on the oxides: 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 and Al2O3 + SiO2 65. Used for the production of ophthalmic sun glasses.

L'invention concerne des verres bruns qui absorbent le rayonnement ultraviolet, et sont caractérisés par le fait qu'ils ont la composition suivante, exprimée en % en poids sur la base des oxydes: SiO¿2? 59-78; Al¿2?O¿3? 2-6; B¿2?O¿3? 0-3; Na¿2?O 7-16; K¿2?O 2-9; CaO 0-7; BaO 0-12; ZnO 0-12; ZrO¿2? 0-6; TiO¿2? 0-6; MnO¿2? 0,25-6; V¿2?O¿5? 1-3; Fe¿2?O¿3? 0-1,5; NiO 0-0,5; CoO 0-0,1; Sb¿2?O¿3? 0-0,7; As¿2?O¿3? 0-0,7; F 0,05-1,0; avec MnO¿2? + Fe¿2?O¿3? + V¿2?O¿5? > 1,5 et Al¿2?O¿3? + SiO¿2? ? 65. Cette composition est utilisée pour la fabrication de verres solaires ophtalmiques.

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