High strength ophthalmic lens

Details High strength ophthalmic lens High strength ophthalmic lens

1976-03-18

1977-08-16

Douglas, Winston A.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 47Q, 351166, C03C 2100, C03C 304, C03C 330

Patent

active

040424057

ABSTRACT:
An ophthalmic glass lens having a compressively-stressed surface zone after ion exchanging which is at least 120 microns in depth, formed from an alkali metal oxide silicate glass comprising by weight about 4 to about 15 percent sodium oxide and about 3 to about 15 percent potassium oxide. There is a compressively-stressed surface layer having a strength of at least 25,000 psi. The total amount of sodium, potassium and other alkali metal oxides is up to about 20 percent. The total amount of zinc oxide, lanthanum oxide, magnesium oxide, and calcium oxide is about 8 to 15 percent, and there is about 3 to about 15 percent phosphorus pentoxide. An ion exchange process takes place at a temperature either above or below the strain point of conventional ophthalmic crown glass to produce satisfactory physical properties in the ophthalmic glass lens.

REFERENCES:
patent: 3433611 (1969-03-01), Saunders et al.
patent: 3441398 (1969-04-01), Hess
patent: 3485647 (1969-12-01), Harrington
patent: 3533888 (1970-10-01), Eppler et al.
patent: 3790260 (1974-02-01), Boyd et al.

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