Unleaded optical lightweight flint or polar lightweight flint glass
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机译：无铅光学轻质打火石或极轻质打火石玻璃
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摘要
PROBLEM TO BE SOLVED: To obtain flint glass having excellent chemical resistance by constituting the flint glass so as to have a composition comprising SiO2, B2O3, K2O, La2O3, Al2O3, La2O3+ZrO2, TiO2 and F- in a specific weight ratio based on oxide and having a prescribed ratio of (Al2O3+La2O3)/(TiO2+ZrO2) and as necessary contain a clarifier and have a prescribed refractive index and Abbe's number. ;SOLUTION: As necessary, a clarifier is added to glass raw material prepared so as to become a prescribed composition and the glass raw material is melted at 1250-1300C and clarified, cast and cooled to provide lead-free optical lightweight flint or extremely lightweight flint glass having a composition comprising 48-55wt.% SiO2, 7-9wt.% B2O3, 18-20wt.% K2O, 7-9wt.% Al2O3, 0.1-2wt.% La2O3, 0-1wt.% ZrO2, 0.5-2wt.% La2O3+ZrO2, 5.5-12wt.% TiO2, 1.5-6wt.% F- and 0.1-0.5wt.% Sb2O3+Cl- based on oxide and having 0.73-1.15 (Al2O3+La2 O3)/(TiO2+ZrO2). The glass has 1.52-1,57 refractive index (nd) and 43-52 Abbe's number (d).;COPYRIGHT: (C)1998,JPO
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机译：解决的问题：通过构成具有包含SiO 2 ，B 2 O 3 < / Sub>，K 2 O，La 2 O 3 ，Al 2 O 3 ，La 2 O 3 + ZrO 2 ，TiO 2 和F -以氧化物为基准的特定重量比且具有规定比例的（Al 2 O 3 + La 2 O 3 < / Sub>）/（TiO 2 + ZrO 2 ），并根据需要包含澄清剂，并具有规定的折射率和阿贝数。 ;解决方案：根据需要，在准备好的玻璃原料中加入澄清剂，使其成为规定的成分，然后将玻璃原料在1250-1300C的温度下熔融并澄清，浇铸和冷却，以提供无铅的光学轻质火石或极轻量的火石。组成为48-55wt。％SiO 2 ，7-9wt。％B 2 O 3 ，18-20wt。％的火石玻璃K 2 O，7-9wt。％Al 2 O 3 ，0.1-2wt。％La 2 O 3 ，0-1wt。％ZrO 2 ，0.5-2wt。％La 2 O 3 + ZrO < Sub> 2 ，5.5-12wt。％TiO 2 ，1.5-6wt。％F -和0.1-0.5wt。％Sb 2 < / Sub> O 3 + Cl -基于氧化物并且具有0.73-1.15（Al 2 O 3 + La 2 O 3 ）/（TiO 2 + ZrO 2 ）。该玻璃的折射率为1.52-1,57（n d ），阿贝数为43-52（ d ）.;版权：（C）1998，JPO
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