Improved photochromic glasses

Details Improved photochromic glasses Improved photochromic glasses

C - Chemistry, Metallurgy

03

C

96/76

C03C 3/093 (2006.01) C03C 3/095 (2006.01) C03C 3/11 (2006.01) C03C 4/06 (2006.01)

Patent

CA 2278518

The invention concerns photochromic glasses with improved properties having the following composition, in wt.%: SiO2: 51-66, B2O3: 15-23, Al2O3: 3-10, ZrO2: 2.5-11, TiO2: 0-1, Li2O: 3-7, Na2O: 0-8, K2O: 2-9, Ag: 0.080-0.30, CuO 0.0020-0.0130, Cl: 0.1-0.6, Br: 0.040-0.3, MgO: 0-3, CaO: 0-3, SrO: 0-3, BaO: 0-3, Nb2O5: 0-1, La2O3: 0-8, Y2O3: 0-8, with 0.2Ag/(Cl+Br)0.5, Br/(Cl+Br)0.15, 0.5La2O3 + Y2O38, TiO2 + Nb2O51.2, 10Al2O3 + ZrO217, MgO + CaO + SrO + BaO6. Use for the production of ophthalmic lenses.

Verres photochtomiques présentant des propriétés améliorées, dont la composition en poucentages pondéraux est la suivante: SiO¿2?: 51-66; B¿2?O¿3?: 15-23; Al¿2?O¿3?: 3-10; ZrO¿2?: 2,5-11; TiO¿2?: 0-1; Li¿2?O: 3-7; Na¿2?O: 0-8; K¿2?O: 2-9; Ag: 0,080-0,30; CuO: > 0,0020-0,0130; Cl: 0,1-0,6; Br: 0,040-0,3; MgO: 0-3; CaO: 0-3; SrO: 0-3; BaO: 0-3; Nb¿2?O¿5?: 0-1; La¿2?O¿3?: 0-8; Y¿2?O¿3?: 0-8, et dans laquelle 0,2 < Ag/(Cl+Br)? 0,5; Br/(Cl+Br)?0,15; 0,5?La¿2?O¿3? + Y¿2?O¿3??8; TiO¿2? + Nb¿2?O¿5??1,2; 10?Al¿2?O¿3? + ZrO¿2??17; MgO + CaO + SrO + BaO?6. Ces verres servent à la production de lentilles ophtalmiques.

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