Transparent, fixed tint glass lenses

Details Transparent, fixed tint glass lenses Transparent, fixed tint glass lenses

C - Chemistry, Metallurgy

03

C

C03C 4/02 (2006.01) C03C 3/085 (2006.01) C03C 4/08 (2006.01) G02C 7/10 (2006.01)

Patent

CA 2181983

A transparent, fixed tint glass lens is provided having a thickness of between about 1.0 mm and about 1.8 mm and which is derived from an alkali silicate composition containing, in terms of weight percent on an oxide basis, at least 6.2 % iron oxides, at least 0.03 % cobalt oxide and at least 0.12 % nickel oxide in the presence of an oxidizing agent such as arsenic oxide. Preferably, the lenses have a transmittance of not more than 1 % of ultraviolet radiation at 380 nm.

Cette invention concerne un verre de lunettes transparent à teinte fixe d'une épaisseur comprise entre 1,0 mm et environ 1,8 mm qu'on produit à partir d'une composition de silicate alcalin qui contient en pourcentage en poids sur une base oxyde au moins 6,2 % d'oxydes ferriques, au moins 0,03 % d'oxyde cobaltique et au moins 0,12 % d'oxyde de nickel qu'on combine en présence d'un agent oxydant tel que de l'oxyde d'arsenic. Ces verres présentent de préférence une transmittance ne dépassant pas 1 % du rayonnement ultraviolet à 380 nm.

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