Silica

Details Silica Silica

2006-09-05

2006-09-05

Cooke, Colleen P. (Department: 1754)

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

C423S335000

Reexamination Certificate

active

07101523

ABSTRACT:
Silica with a large pore volume, a large specific surface area, a narrow pore distribution, low contents of unwanted metal impurities, and excellent physical properties such as high heat-resistance and water-resistance is provided. The silica has a mode pore diameter (Dmax) of 20 nm or less, and a solid-state Si nuclear magnetic resonance (hereinafter called solid-state Si NMR) spectrum of the silica includes a chemical shift (δ ppm) of Q4peak meeting the following inequality (I).in-line-formulae description="In-line Formulae" end="lead"?−0.0705×(Dmax)−110.36>δ  (I)in-line-formulae description="In-line Formulae" end="tail"?The silica with such properties can be suitably used in fields of which particularly excellent heat resistance and water resistance are required, and moreover controlled pore properties, and the fact that physical properties scarcely change over a long period of time are required among the above-mentioned applications.

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Chinese Office Action dated Mar. 5, 2004.

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