High index ophthalmic glasses

Details High index ophthalmic glasses High index ophthalmic glasses

C - Chemistry, Metallurgy

03

C

C03C 4/00 (2006.01) C03C 3/072 (2006.01) C03C 3/108 (2006.01)

Patent

CA 2066495

Abstract of the Disclosure This invention relates to the production of glasses exhibiting a refractive index between about 1.66-1.81, a softening point between about 625°-675°C, a strain point between about 455°-490°C, a linear coefficient of thermal expansion (25°-300°C) between about 53-65x10-7/°C, and goodchemical durability which consist essentially, in weight percent, of: SiO2 24-42 Li2O 0.2 Li2O+Na2O+K2O 0-3.5 Al2O3 3-7.5 Na2O 0-2 ZrO2 0-2.5 B2O3 2-7.5 K2O 0-3 TiO2 0-8 PbO 35-57 La2O3 0-8 La2O3+ZrO2+TiO2 4 12

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