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    • 14. 发明授权
    • Ultraviolet absorbing photochromic glass of low silver content
    • 紫外线吸收光银色含量低的玻璃
    • US4549894A
    • 1985-10-29
    • US617908
    • 1984-06-06
    • Roger J. AraujoGeorge B. HaresDavid J. KerkoDavid W. MorganDavid L. Morse
    • Roger J. AraujoGeorge B. HaresDavid J. KerkoDavid W. MorganDavid L. Morse
    • C03C3/091C03C4/06
    • C03C4/06C03C3/091
    • There is disclosed a method of producing a photochromic glass having a reduced transmittance for ultraviolet radiation while having substantially unimpaired photochromic properties. The method comprises providing a combination of 0.1-1.0% CeO.sub.2 and 0.1-1.5% Sb.sub.2 O.sub.3 and/or As.sub.2 O.sub.3 as part of the glass composition. In an embodiment utilizing minimal silver content, the glass article in thicknesses of 1.3 to 2.0 mm. can be chemically strengthened to surpass the impact specification imposed by the Federal Food and Drug Administration for eyewear, will transmit less than 0.2% of radiation having wavelengths between 290-315 nm, and will demonstrate a darkened luminous transmittance at 20.degree.-25.degree. C. below 35% and a fading rate such that after five minutes the luminous transmittance will be at least 1.75 times that of the darkened transmittance. These glasses consist essentially of:______________________________________ SiO.sub.2 55-61 Ag >0.1-
    • 公开了一种具有降低的紫外线辐射透射率而具有基本上未受损的光致变色特性的光致变色玻璃的方法。 该方法包括提供0.1-1.0%CeO 2和0.1-1.5%Sb 2 O 3和/或As 2 O 3的组合作为玻璃组合物的一部分。 在使用最小银含量的实施方案中,玻璃制品的厚度为1.3至2.0mm。 可以化学强化超过联邦食品和药物管理局对眼镜施加的影响规格,将传播波长在290-315 nm之间的辐射不到0.2%,并将在20°-25°C显示变暗的透光率 低于35%,并且褪色速率使得在5分钟后,透光率将至少为透光度变暗的1.75倍。 这些玻璃基本上由以下组成:-SiO2 55-61 Ag> 0.1- <0.2- B2O3 18-21 Cl 0.2-0.6 -Al2O3 5-11 Br 0.05-0.2 -Li2O 1.5-3 CuO 0.003-0.015 -Na2O 2-5 CeO2 0.1-1.0 -K2O 4.5-8 Sb2O3 0.1-1.5 -