Method of manufacturing spherical silica particles
April 16, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesProcess for producing silica in fine powder form Process for manufacturing high purity silica Spherical silica glass powder particles and process for their production Process for producing unsintered cristobalite silica Process for preparing precipitated silica Process for producing silica of high purity Porous structures Patent #: 4913966 InventorsAssigneeApplicationNo. 508813 filed on 04/16/1990US Classes:264/12, By impinging or atomizing with gaseous jet or blast264/13, By extrusion spraying or gravity fall through orifice264/621, Utilizing sol or gel423/335, Silica423/338, By gelling423/339By precipitatingExaminersPrimary: Theisen, Mary LynnAttorney, Agent or FirmForeign Patent References
International ClassesB29B 009/10C01B 033/12 C01B 033/18 Foreign Application Priority Data1989-04-17 JPAbstractA method of manufacturing spherical silica particles comprising the steps of processing in an acid-containing solution and then washing with water the coagulant derived from an aqueous alkali metal silicate solution extruded through pores in a water-miscible organic medium or acid solution, wet-grinding the amorphous silica thus obtained in a liquid dispersion medium to obtain a fine particle silica suspension with a weight average particle size of 10 μm or less, spray-drying this fine particle silica suspension with hot air and sintering the spherical granulated silica thus obtained. According to the present invention, the high-purity spherical silica particles can be obtained with high solidity and adjusted surface smoothness without any complicated operation or waste water treatment for use as a sealant filler for highly-integrated IC electronic parts. |
| ||||||||||||||
