Glass prepared from pyrogenically prepared silicon dioxide
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United States of America Patent
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May 10, 2005
Grant Date -
Jun 17, 2004
app pub date -
Dec 8, 2003
filing date -
Aug 21, 2000
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Abstract
Pyrogenically prepared silicon dioxide with the following physicochemical properties: 1. Average particle size (D50 value) D50≧150 nm (dynamic light scattering, 30 wt %) 2. Viscosity (5 rpm, 30 wt %) η≦100 m·Pas 3. Thixotropy of Ti (η(5 rpm))/(η(50 rpm))≦2 4. BET surface area 30-60 m2/g 5. Compacted bulk=100-160 g/L 6. Original pH≦4.5
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