High refractive index hydrated glasses

Details High refractive index hydrated glasses High refractive index hydrated glasses

C - Chemistry, Metallurgy

03

C

261/15, 261/17

C03C 3/102 (2006.01) C03C 23/00 (2006.01)

Patent

CA 1086780

HIGH REFRACTIVE INDEX HYDRATED GLASSES Abstract of the Disclosure The present invention is directed to the preparation of hydrated glasses in the Na2O - K2O - PbO - SiO2 base composition system containing an amount of BaO and/or Y2O3 and/or ZnO and/or ZrO2 effective to cause the hydrated glass to be essentially colorless. Such glasses are transparent, exhibit refractive indices higher than 1.60, and which demonstrate intrinsic thermoplastic properties thereby enabling such to be readily molded into optical quality components at relatively low temperatures. The operable glasses in the anhydrous state consist essentially, in mole percent on the oxide basis, of 8-18% Na2O, 2-6% K2O, 10-23% Na2O + K2O, >15 but <21% PbO, 55-67% SiO2, the mole ratio PbO:SiO2 being between 0.225-0.3, and an effective amount of BaO and/or Y2O3 and/or ZnO and/or ZrO2 up to the indicated maxima of 5% BaO, 5% Y2O3, 8% ZnO, and 5% ZrO2, BaO + Y2O3 + ZnO + ZrO2 not exceeding 10%.

311685

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