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:
Dec. 20, 2005
Filed:
Jun. 06, 1997
Heinz Esch, Bonn, DE;
Udo Görl, Bornheim-Roisdorf, DE;
Robert Kuhlmann, Erfstadt, DE;
Ralf Rausch, Kreuzau, DE;
Heinz Esch, Bonn, DE;
Udo Görl, Bornheim-Roisdorf, DE;
Robert Kuhlmann, Erfstadt, DE;
Ralf Rausch, Kreuzau, DE;
Degussa AG, Dusseldorf, DE;
Abstract
A precipitated silica with the following physicochemical properties: is produced by reacting alkali silicate with mineral acids at temperatures of 60° C. to 95° C. while maintaining a pH of 7.5 to 10.5 and continuously stirring, continuing the reaction to a solids concentration in the precipitation suspension of 90 g/l to 120 g/l, adjusting the pH value to a value of less than or equal to 5, filtering out, washing, drying and optionally grinding or granulating the precipitated silica. The precipitated silica is used as a filler in vulcanizable rubber compounds and vulcanizates.