Method for making precipitated silica or silicate...

Details Method for making precipitated silica or silicate... Method for making precipitated silica or silicate...

2006-10-24

2006-10-24

Marcheschi, Michael (Department: 1755)

Abrasive tool making process, material, or composition

With inorganic material

Clay, silica, or silicate

C051S309000, C106S482000, C106S483000, C106S484000, C106S485000, C106S486000, C106S492000, C423S335000, C423S338000, C423S339000

Reexamination Certificate

active

07125432

ABSTRACT:
New methods of producing narrower particle size distribution precipitated silica and/or silicate materials are provided. Such a method permits a significant reduction in manufacturing costs through the utilization of more efficient drying/evaporation components, in essence, in one potentially preferred embodiment, production of such silica and/or silicate materials followed directly by a hydraulic chamber press filtering step combined with vacuum dewatering subsequently leading to the needed resultant particle comminution. The resultant precipitated silicas and/or silicates produced thereby exhibit greater density prior to comminution and thus greater propensity for more uniform milling than previously utilized and prevalent spray/flash drying apparatuses. Also encompassed within this invention are the resultant precipitated silica and/or silicate particles produced, including those that surprisingly exhibit extremely high transmittance properties, thereby potentially providing excellent narrow particle distribution silica materials for clear (transparent) end-uses.

REFERENCES:
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patent: 6403059 (2002-06-01), Martin et al.
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patent: 6652611 (2003-11-01), Huang et al.
patent: 2003/0019162 (2003-01-01), Huang
patent: 0 978 304 (2000-02-01), None
patent: 97/00171 (1997-01-01), None

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