초록 ▼

The invention is a green soda-lime-silica glass composition having excellent ultra violet absorbing ability while having a relatively high light transmittance. The colorants of the glass composition consist essentially of: greater than 0.5 to 1.5 wt. % total iron oxide as Fe.sub.2 O.sub.3 ; wherein

The invention is a green soda-lime-silica glass composition having excellent ultra violet absorbing ability while having a relatively high light transmittance. The colorants of the glass composition consist essentially of: greater than 0.5 to 1.5 wt. % total iron oxide as Fe.sub.2 O.sub.3 ; wherein the weight ratio of Fe.sup.+2 /Fe.sup.+3 is less than 0.35; 0.10 to 2.00 wt. % manganese compound as MnO.sub.2 ; and optionally any of: up to 1.00 wt. % titanium oxide as TiO.sub.2, up to 1.00 wt. % cerium oxide as CeO.sub.2 ; up to 1.00 wt. % vanadium oxide as V.sub.2 O.sub.5 ; and up to 0.20 wt. % chromium oxide as Cr.sub.2 O.sub.3 ; the glass composition having, at 4.0 mm. thickness: 55 to 80% light transmittance using Illuminant A with less than 46% ultra violet transmittance measured over the range of 300 to 400 nanometers.

대표청구항 ▼

[ We claim:] [1.] A green ultra violet absorbing glass composition having a base glass composition comprising by weight: 68 to 75% SiO.sub.2, 10 to 18% Na.sub.2 O, 5 to 15% CaO, 0 to 10% MgO, 0 to 5% Al.sub.2 O.sub.3, and 0 to 5% K.sub.2 O, where CaO+MgO is 6 to 15% and Na.sub.2 O+K.sub.2 O is 10 to

[ We claim:] [1.] A green ultra violet absorbing glass composition having a base glass composition comprising by weight: 68 to 75% SiO.sub.2, 10 to 18% Na.sub.2 O, 5 to 15% CaO, 0 to 10% MgO, 0 to 5% Al.sub.2 O.sub.3, and 0 to 5% K.sub.2 O, where CaO+MgO is 6 to 15% and Na.sub.2 O+K.sub.2 O is 10 to 20%; and colorants consisting essentially of: greater than 0.5 to 1.5 wt. % total iron oxide as Fe.sub.2 O.sub.3, wherein the weight ratio of Fe.sup.+2 /Fe.sup.+3 is less than 0.35; 0.10 to 2.00 wt. % manganese compound as MnO.sub.2; and optionally any of: up to 1.00 wt. % titanium oxide as TiO.sub.2 ; up to 1.00 wt. % cerium oxide as CeO.sub.2 ; up to 1.00 wt. % vanadium oxide as V.sub.2 O.sub.5 ; and up to 0.20 wt. % chromium oxide as Cr.sub.2 O.sub.3 ; the glass having at a 4.0 mm. thickness: 55 to 80% light transmittance using Illuminant A with less than 46% ultra violet transmittance measured over the range of 300 to 400 nanometers.