Momentive Performance Materials Gmbh

Martin Panchula

Konstantin Zuyev

Samuel Conzone

Guangjun Xu

Tianjun Rong

Kipyung Ahn

Yen Zhou

Robert Stephen Pavlik, Jr

Antonio L DeVera

Ben Matthew Gauthier

Nathan J Cassingham

Yan Zhou

A high silica glass composition comprising about 92 to about 99.9999 wt. % SiOand from about 0.0001 to about 8 wt. % of at least one dopant selected from AlO, CeO, TiO, LaO, YO, NdO, 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&#xb0; 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.

Fused quartz tubing for pharmaceutical packaging

The present invention is directed to a method of making metal oxide and mixed metal oxide particles. The method includes treating a mixture formed from a metal source, such as metal alkoxide, a surfactant, and a first alcohol in an aqueous media at a very high metal oxide yield. The mixture is reacted using a catalyst to form metal oxide particles having a desired particle size in said mixture. By washing the particles with an aprotic solvent, the residual carbon content of the particles can be significantly reduced. The method is particularly suitable for forming silica particles. The metal oxide particles can then be heat treated to form synthetic fused metal oxides such as, for example, synthetic fused silica.

Method for making high purity metal oxide particles and materials made thereof

The invention relates to a silica glass compound having improved physical and chemical properties. In one embodiment, the present invention relates to a silica glass having a desirable brittleness in combination with a desirable density while still yielding a glass composition having a desired hardness and desired strength relative to other glasses. In another embodiment, the present invention relates to a silica glass composition that contains at least about 85 mole percent silicon dioxide and up to about 15 mole percent of one or more dopants selected from F, B, N, Al, Ge, one or more alkali metals (e.g., Li, Na, K, etc.), one or more alkaline earth metals (e.g., Mg, Ca, Sr, Ba, etc.), one or more transition metals (e.g., Ti, Zn, Y, Zr, Hf, etc.), one or more lanthanides (e.g., Ce, etc.), or combinations of any two or more thereof.

Silica glass having improved properties

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Eastlake, OH, United States of America

Martin Panchula