INFRARED ABSORBENT GREEN GLASS COMPOSITION AND LAMINATED GLASS INCLUDING THE SAME

摘要

A glass composition that has improved infrared absorptivity while preventing the visible light transmittance from decreasing excessively. The glass composition includes: the following components, expressed in mass%: 65 < SiO 2 ‰¤ 75; 0 ‰¤ B 2 O 3 ‰¤ 5; 0 ‰¤ Al 2 O 3 ‰¤ 5; 0 ‰¤ MgO < 2; 10 < CaO ‰¤ 15; 0 ‰¤ SrO ‰¤ 10; 0 ‰¤ BaO ‰¤ 10; 0 ‰¤ Li 2 O ‰¤ 5; 10 ‰¤ Na 2 O ‰¤ 15; 0 ‰¤ K 2 O ‰¤ 5; and 0 ‰¤ TiO 2 ‰¤ 0.5, where 10 < MgO + CaO + SrO + BaO ‰¤ 20 and 10 ‰¤ Na 2 O + K 2 O ‰¤ 17.5; MnO 0 to 300 mass ppm; and the following components as colorants, expressed in mass %: 0.4 ‰¤ T-Fe 2 O 3 ‰¤ 1.0, where T-Fe 2 O 3 is total iron oxide expressed as Fe 2 O 3 ; and 0 ‰¤ CeO 2 ‰¤ 2.0. The mass ratio of FeO expressed as Fe 2 O 3 to T-Fe 2 O 3 is 20 to 44%. The wavelength at which a minimum transmittance is obtained in a range of 550 to 1700 nm is at least 1065 nm. The transmittance that is obtained at a wavelength of 1650 nm is not higher than the transmittance that is obtained at a wavelength of 730 nm.