Process for manufacturing high purity silica
Patent 4683128 Issued on July 28, 1987. Estimated Expiration Date: 
June 25, 2006. 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.
June 25, 2006. 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 References 3846537 3857924 Method of selectively producing high pore volume silica gel Process for the production of spherical silica gel Patent #: 4089932 InventorsAssigneeApplicationNo. 06/878773 filed on 06/25/1986US Classes:423/338, By gelling423/335, Silica423/339, By precipitating423/340By purifying sandExaminersPrimary: Doll, JohnAssistant: Freeman, Lori S. Attorney, Agent or FirmInternational ClassesC01B 33/152 (20060101)C01B 33/18 (20060101) C03B 37/095 (20060101) C03B 37/00 (20060101) C03B 37/01 (20060101) C03C 13/00 (20060101) C01B 33/00 (20060101) Foreign Application Priority Data1985-06-27 JPAbstractThis invention deals with a process for manufacturing high purity silica which comprises making an aqueous alkali silicate solution into fine fibrous gel in a coagulant, treating the fibrous gel obtained with an acid-containing solution, and then with water to extract and remove impurities; and optionallly heating a resulting silica at a temperature of 1,000° C. or higher. Thus obtained silica is preferably used as a filler, especially, the one for resin compositions for encapsulating electronic parts; etc.Other References
|
| ||||||||||||||
