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AssigneeMomentive Performance Materials Inc.
InventorsKipyung Ahn, Guangjun Xu, Martin Panchula, Samuel Conzone, Tianjun Rong, Konstantin S. Zuyev, Yen Zhou
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A high silica glass composition comprising about 92 to about 99.9999 wt. % SiO2 and from about 0.0001 to about 8 wt. % of at least one dopant selected from Al2O3, CeO2, TiO2, La2O3, Y2O3, Nd2O3, other rare earth oxides, and mixtures of two or more thereof. The glass composition has a working point temperature ranging from 600 to 2,000° C. These compositions exhibit stability similar to pure fused quartz, but have a moderate working temperature to enable cost effective fabrication of pharmaceutical packages. The glass is particularly useful as a packaging material for pharmaceutical applications, such as, for example pre-filled syringes, ampoules and vials.
A silica glass composition comprising about 92 to about 99.9 wt. % SiO2 and about 0.1 to about 8 wt. % of a dopant selected from Al2O3, GeO2, Ga2O3, CeO2, ZrO2, TiO2, Y2O3, a rare earth oxide, or mixtures of two or more thereof, wherein the composition does not contain an appreciable amount of alkali metals, alkaline earth metals, or borate ions.
A glass article comprising a silica glass composition comprising about 92 to about 99.9 wt. % SiO2 and about 0.1 to about 8 wt. % of a dopant selected from Al2O3, GeO2, Ga2O3, CeO2, ZrO2, TiO2, Y2O3, a rare earth oxide, or mixtures of two or more thereof, wherein the silica glass composition does not contain an appreciable amount of alkali metals, alkaline earth metals, or borate ions, the article having a total extractable metal concentration of about 8 mg/L or less when subjected to HCl digestion, the total extractable metal concentration being represented by the total concentration of Al, B, Na, Ca, K, Li, Ba, and Mg extracted upon HCl digestion;
A silica glass composition comprising at least 99.9% wt. % SiO2 and a dopant selected from Al2O3, GeO2, Ga2O3, CeO2, ZrO2, TiO2, Y2O3, a rare earth oxide, or mixtures of two or more thereof in an amount of about 0.1 to about 0.0001 wt. %, wherein the composition does not contain an appreciable amount of alkali metals, alkaline earth metals, or borate ions.
Dependencies are inferred from the claim text.