High index glasses

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C - Chemistry, Metallurgy

03

C

C03C 3/095 (2006.01) C03C 3/062 (2006.01) C03C 3/066 (2006.01) C03C 3/068 (2006.01) C03C 3/078 (2006.01) C03C 3/087 (2006.01) C03C 3/089 (2006.01) C03C 3/093 (2006.01) C03C 3/097 (2006.01) C03C 3/11 (2006.01) C03C 3/112 (2006.01) C03C 3/115 (2006.01) C03C 3/118 (2006.01) C03C 4/00 (2006.01) G02B 1/00 (2006.01)

Patent

CA 2210680

This invention is directed to the production of glasses essentially free of Nb2O5, and having refractive index close to 1.7, an Abbe number of about 35 and a density close to 3.2. The glasses consist essentially in weight percent on the oxide basis, of SiO2 38-45, TiO2 15-<20. ZrO2 6-10, La2O3 0.5-4, BaO 12-19, CaO 3-8, BaO+CaO+SrO 17-25, Na2O 2- 6, K2O 4-8, Li2O+Na2O+K2O 6-10.5.

L'invention concerne la fabrication de verres essentiellement dépourvus de Nb2O5, ayant par ailleurs un indice de réfraction proche de 1,7, un nombre de Abbe environ égal à 35 et une densité proche de 3,2. La teneur en oxides de ces verres, en poids et en pourcentage, est essentiellement la suivante: SiO2 38-45, TiO2 15-<20, ZrO2 6-10, La2O3 0,5-4, BaO 12-19, CaO 3-8, BaO+CaO+SrO 17-25, Na2O 2-6, K2O 4-8, Li2O+Na2O+K2O 6-10,5.

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