High refractive index hydrated glasses

Details High refractive index hydrated glasses High refractive index hydrated glasses

1977-10-20

1978-07-11

Douglas, Winston A.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 47Q, C03C 310, C03C 330

Patent

active

040999785

ABSTRACT:
The present invention is directed to the preparation of hydrated glasses in the Na.sub.2 O-K.sub.2 O-PbO-SiO.sub.2 base composition system containing an amount of BaO and/or Y.sub.2 O.sub.3 and/or ZnO and/or ZrO.sub.2 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% Na.sub.2 O, 2-6% K.sub.2 O, 10-23% Na.sub.2 O + K.sub.2 O, >15 but <21% PbO, 55-67% SiO.sub.2, the mole ratio PbO:SiO.sub.2 being between 0.225-0.3, and an effective amount of BaO and/or Y.sub.2 O.sub.3 and/or ZnO and/or ZrO.sub.2 up to the indicated maxima of 5% BaO, 5% Y.sub.2 O.sub.3, 8% ZnO, and 5% ZrO.sub.2, BaO + Y.sub.2 O.sub.3 + ZnO + ZrO.sub.2 not exceeding 10%.

REFERENCES:
patent: 3498802 (1970-03-01), Bickford et al.
patent: 3498803 (1970-03-01), Stookey
patent: 3811853 (1974-05-01), Bartholomew et al.
patent: 4026692 (1977-05-01), Bartholomew et al.
patent: 4046545 (1977-09-01), Sanford et al.

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