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:
Feb. 02, 2010
Filed:
Apr. 19, 2007
Applicants:
Gerrit Fester, Auerbach / V., DE;
Gerhard Roewer, Freiberg, DE;
Edwin Kroke, Freiberg, DE;
Inventors:
Assignee:
Evonik Degussa GmbH, Essen, DE;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07F 7/08 (2006.01);
U.S. Cl.
CPC ...
Abstract
The present invention relates to a for controlled synthesis of hydrogen-rich cyclosiloxanes of the (HSiO)type. where n is an integer equal to or greater than 3, by reacting: The ring size is advantageously adjustable to n=3, 4, 5, 6 (especially n=4 to 6), such that larger rings are not formed. In a particularly advantageous embodiment of the process, for the selective preparation of cyclohexasiloxane (HSiO), after the reaction, the solvent is at least partly removed and then solvent is added again.