Ophthalmic segment glass with high nd

C - Chemistry – Metallurgy – 03 – C

Patent

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C03C 3/072 (2006.01)

Patent

CA 2408225

The present invention relates to very high refractive index glasses (1.78 < n < 1.83), having the following composition of oxides, expressed in percentages by weight :SiO220- < 27B2O35-11Li2O2-8Na2O0-5K2O0-5BaO7-15CaO0-11La2O37-12PbO7- 20TiO27-14ZrO20-5Nb2O5 > 8-16with: Li2O+Na2O+K2O > 6BaO+CaO+La2O3 > 27TiO2+Nb2O5+PbO > 29,to their use for the production of segments for multifocal corrective lenses and to multifocal corrective lenses incorporating at least one such segment in their structure.

La présente invention concerne des verres à indice de réfraction très élevé (1,78 < n <= 1,83) comprenant les oxydes suivants, dont la concentration est exprimée en pourcentage en poids: SiO¿2?: entre 20 et < 27, B¿2?O¿3?: entre 5 et 11, Li¿2?O: entre 2 et 8, Na¿2?O: entre 0 et 5, K¿2?O: entre 0 et 5, BaO: entre 7 et 15, CaO: entre 0 et 11, La¿2?O¿3?: entre 7 et 12, PbO: entre 7 et 20, TiO¿2?: entre 7 et 14, ZrO¿2?: entre 0 et 5, et Nb¿2?O¿5?: entre > 8 et 16, pour autant que Li¿2?O+Na¿2?O+K¿2?O > 6, BaO+CaO+La¿2?O¿3? > 27 et TiO¿2?+Nb¿2?O¿5?+PbO > 29. L'invention concerne également leur utilisation pour la production de segments destinés à des lentilles correctrices multifocales, ainsi que des lentilles correctrices multifocales comportant au moins un segment de ce type dans leur structure.

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