Ultraviolet absorbing, fixed tint green or brown sunglass

Details Ultraviolet absorbing, fixed tint green or brown sunglass Ultraviolet absorbing, fixed tint green or brown sunglass

C - Chemistry, Metallurgy

03

C

C03C 4/08 (2006.01) C03C 3/085 (2006.01) C03C 3/089 (2006.01) C03C 3/091 (2006.01) C03C 4/02 (2006.01)

Patent

CA 2137641

Transparent green or brown glass which, at a thickness of 2 mm, transmits less than 1% of ultraviolet radiation having a wavelength of 380 nm, and which, if the fixed tint is green, are composed of SiO2 65-72 Na2O+K2O 15-21 B2O3 3-8 CaO 0-4 Al2O3 0.5-5 ZnO 0-4 Na2O 6-12 CaO+ZnO 1-5 K2O 6-12 Fe2O3 4.8-7 the fixed green tint being defined by the area bounded by apices A,C,D,E,A of the drawing, having a purity between 18-32%, and a dominant wavelength between 554 - 564 nm, and which, if the fixed tint is brown, are composed of SiO2 65-72 CaO 0-5.5 B2O3 3-8 ZnO 0-4 Na2O 6-10 CaO+ZnO 2-5.5 K2O 7-12 Fe2O3 3-5 Na2O+K2O 15-20 Se 0.01-2 Al2O3 0-4 NiO 0-0.12 the fixed brown tint being defined by the area bounded by apices A',B',D',F',A' of the drawing, having a purity between 48 - 70%, and a dominant wavelength between 580-588 nm.

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