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:
Nov. 02, 2010
Filed:
Dec. 14, 2007
Wilfried Knott, Essen, DE;
Klaus-dieter Klein, Muelheim, DE;
Rüdiger Landers, Essen, DE;
Dagmar Windbiel, Essen, DE;
Wilfried Knott, Essen, DE;
Klaus-Dieter Klein, Muelheim, DE;
Rüdiger Landers, Essen, DE;
Dagmar Windbiel, Essen, DE;
Evonik Goldschmidt GmbH, , DE;
Abstract
The invention relates to a process for the preparation of SiOC-linked, linear polydimethylsiloxane-polyoxyalkylene block copolymers having (AB) repeat units, via reaction of one or more polyetherdiols with a stoichiometric excess of α,ω-dihydropolydimethylsiloxanes and at least one tertiary amine as catalyst, which comprises, after completed reaction of the alcohol component, continuing the reaction in the presence of small amounts of water until no remaining ≡Si(H) groups are detectable by a gas-volumetric method.