Optical quality colored glass

Claim 2

A phosphate glass rich in alkali and alkaline earth metal oxides and containing CuO as a coloring component for optical filter glass in the spectral range from 350 nm to 850 nm, consisting essentially of the following synthesis-composition (in wt. %): ______________________________________ P.sub.2 O.sub.5 65.00-70.00 SiO.sub.2 0.00-0.75 B.sub.2 O.sub.3 0.00-2.00 Al.sub.2 O.sub.3 2.50-6.00 R.sub.2 O 11.00-17.00 BaO 3.00-9.50 CeO.sub.2 0.45-2.00 Cl.sup.- 0.15-0.75 CuO 2.55-6.55 F.sup.- 0.25-1.50 Refining Agents 0.10-2.00 ______________________________________ wherein R 2 O is at least one alkali metal oxide.

Claim 3

Glass according to claim 1, characterized in that ΣCeO 2 +Al 2 O 3 +BaO+CuO≧10.45% wt. % and ΣR 2 O+F - +Cl - ≦16.9% wt. %.

Claim 4

Glass according to claim 1, characterized in that, with 2.75-5.50 wt. % CuO in a 2 mm thick filterglass, UV-transmission at λ=350 nm can be maintained between ≧69% and ≧83%; the transmissivity difference of the two color concentrations at λ=450 nm is only 1% and does not fall below a transmission of 90%; and the absorption at wavelength λ=700 nm increases from ≦12% up to ≦2.0%.

Claim 5

Glass according to claim 1, characterized in that the transformation range (Tg) is lower than 380° C. when elongation (20°-300° C.) increases to ≧110×10 -7 grd -1 and does not increase beyond 138×10 -7 grd -1 .

Claim 6

Glass according to claim 1, characterized in that it contains: 3.0-6.0 wt. % Na 2 O 5.5-7.5 wt. % K 2 O 3.0-6.0 wt. % Li 2 O 0.0-1.0 wt. % MgO 0.0-1.5 wt. % CaO 0.0-2.0 wt. % SrO 0.0-1.0 wt. % ZnO and/or CdO 0.1-2.0 wt. % As 2 O 3 , Sb 2 O 3 or Sb 2 O 5 .

Claim 7

Glass according to claim 2, characterized in that, with 2.75-5.50 wt. % CuO in a 2 mm thick filterglass, UV-transmission at λ=350 nm can be maintained between ≧69% and ≧83%; the transmissivity difference of the two color concentrations at λ=450 nm is only 1% and does not fall below a transmission of 90%; and the absorption at wavelength λ=700 nm increases from ≦12% up to ≦2.0%.

Claim 8

Glass according to claim 2, characterized in that the transformation range (Tg) is lower than 380° C. when elongation (20°-300° C.) increases to ≧110×10 -7 grd -1 and does not increase beyond 138×10 -7 grd -1 .

Claim 9

Glass according to claim 2, characterized in that it contains: 3.0-6.0 wt. % Na 2 O 5.5-7.5 wt. % K 2 O 3.0-6.0 wt. % Li 2 O 0.0-1.0 wt. % MgO 0.0-1.5 wt. % CaO 0.0-2.0 wt. % SrO 0.0-1.0 wt. % ZnO and/or CdO 0.1-2.0 wt. % As 2 O 3 , Sb 2 O 3 or Sb 2 O 5 .

Claim 10

Glass according to claim 1, characterized in that: (a) with 2.75-5.50 wt. % CuO in a 2 mm thick filterglass, UV-transmission at λ=350 nm can be maintained between ≧69% and ≧83%; the transmissivity difference of the two color concentrations at λ=450 nm is only 1% and does not fall below a transmission of 90%; and the absorption at wavelength λ=700 nm increases from ≦12% up to ≦2.0%; and (b) the transformation range (Tg) is lower than 380° C. when elongation (20°-300° C.) increases to ≧110×10 -7 grd -1 and does not increase beyond 138×10 -7 grd -1 .

Claim 11

Glass according to claim 8, characterized in that, with 2.75-5.50 wt. % CuO in a 2 mm thick filterglass, UV-transmission at λ=350 nm can be maintained between ≧69% and ≧83%; the transmissivity difference of the two color concentrations at λ=450 nm is only 1% and does not fall below a transmission of 90%; and the absorption at wavelength λ=700 nm increases from ≧12% up to ≧2.0%.

Claim 12

Glass according to claim 8, characterized in that the transformation range (Tg) is lower than 380° C. when elongation (20°-300° C.) increases to ≧110×10 -7 grd -1 and does not increase beyond 138×10 -7 grd -1 .

Claim 13

Glass according to claim 1 consisting essentially of the following composition: ______________________________________ P.sub.2 O.sub.5 66.60-69.00 B.sub.2 O.sub.3 1.10-1.75 SiO.sub.2 0.00-0.65 Al.sub.2 O.sub.3 4.15-5.55 R.sub.2 O, being 12.35-15.50 Li.sub.2 O 3.30-4.40 Na.sub.2 O 3.45-4.40 K.sub.2 O 5.60-6.70 as well as MgO 0.00-0.45 CaO 0.00-0.80 SrO 0.00-1.50 BaO 3.30-6.15 ZnO and/or CdO 0.00-0.45 CeO.sub.2 0.45-1.25 Cl.sup.- 0.15-0.20 F.sup.- 0.70-1.20 refining agents As.sub.2 O.sub.3 and/or 0.40-0.95 As.sub.2 O.sub.5 ; Sb.sub.2 O.sub.3 ; Sb.sub.2 O.sub.5 coloring agent 2.55-5.35 CuO ______________________________________

Claim 14

Glass according to claim 5 having a Tg of about 312° C. and α(20°-300° C.)×10 -7 grd -1 of about 133.1 consisting essentially of the following composition: ______________________________________ B.sub.2 O.sub.3 1.10% Li.sub.2 O 4.40% Na.sub.2 O 4.40% K.sub.2 O 6.70% CaO 0.40% BaO 4.35% Al.sub.2 O.sub.3 4.15% CeO.sub.2 1.25% As.sub.2 O.sub.3 0.40% P.sub.2 O.sub.5 66.60% Cl.sup.- 0.20% F.sup.- 0.70% CuO 5.35% ______________________________________

Claim 15

Glass according to claim 5 having a Tg of about 318.5° C. and α(20°-300° C.)×10 -7 grd -1 of about 134.0 consisting essentially of the following composition: ______________________________________ SiO.sub.2 0.65% B.sub.2 O.sub.3 1.10% Li.sub.2 O 4.50% Na.sub.2 O 4.50% K.sub.2 O 6.50% CaO 0.80% BaO 6.15% ZnO 0.40% Al.sub.2 O.sub.3 4.20% CeO.sub.2 0.50% As.sub.2 O.sub.3 0.40% P.sub.2 O.sub.5 66.65% Cl.sup.- 0.20% F.sup.- 0.70% CuO 2.75% ______________________________________

Claim 16

Glass according to claim 5 having a Tg of about 375° C. and α(20°-300° C.)×10 -7 grd -1 of about 115.2 consisting essentially of the following composition: ______________________________________ B.sub.2 O.sub.3 1.75% Li.sub.2 O 3.30% Na.sub.2 O 3.45% K.sub.2 O 5.60% MgO 0.45% SrO 1.50% BaO 3.30% ZnO 0.45% Al.sub.2 O.sub.3 5.55% CeO.sub.2 0.45% As.sub.2 O.sub.3 0.95% P.sub.2 O.sub.5 69.35% Cl.sup.- 0.15% F.sup.- 1.20% CuO 2.55% ______________________________________