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:
Jan. 07, 2020
Filed:
May. 14, 2018
Applicant:
Evonik Degussa Gmbh, Essen, DE;
Inventors:
Wilfried Knott, Essen, DE;
Dagmar Windbiel, Essen, DE;
Assignee:
Evonik Degussa GmbH, Essen, DE;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C08G 77/08 (2006.01); C08G 77/46 (2006.01); C08F 283/12 (2006.01); C08G 77/50 (2006.01); C08G 77/12 (2006.01);
U.S. Cl.
CPC ...
C08G 77/46 (2013.01); C08F 283/128 (2013.01); C08G 77/08 (2013.01); C08G 77/50 (2013.01); C08G 77/12 (2013.01);
Abstract
A process for preparing SiC-bonded polyethersiloxanes by precious metal-catalysed addition of olefinically unsaturated polyethers onto siloxanes having SiH groups is described, wherein, prior to commencement of reaction, the siloxane having SiH groups is mixed with an olefinically unsaturated polyether and with a polyethersiloxane by stirring, and then contacted with a precious metal catalyst and optionally further additives, and the SiC bond formation reaction is conducted up to an SiH conversion, determined by gas-volumetric means, of at least 97%.