The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 07, 2005
Filed:
Feb. 08, 2002
Ralf Maus, Frankfurt, DE;
Thomas Barthel, Frankfurt, DE;
Claas-jürgen Klasen, Freigericht, DE;
Degussa AG, Duesseldorf, DE;
Abstract
The present invention provides silica particles, which include the following physical properties: BET surface area: 100-700 m/g; DBP absorption: 100-500 g/100 g; tamped density: 100-250 g/l; ALPINE sieve residue>63μ: <5%; and particle sizes (cumulative volume distribution): d<40 μm; d<20 μm; and d<10 μm. The present invention also provides a process for producing silica having a narrow particle size distribution, which includes drying a silica suspension in a pulse combustion dryer to produce silica particles having the following particle size distribution (cumulative volume distribution): d<10 μm; d<20 μm; and d<40 μm.