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;
Juergen Droese, Essen, DE;
Klaus Dieter Klein, Muelheim, DE;
Rüdiger Landers, Essen, DE;
Dagmar Windbiel, Essen, DE;
Wilfried Knott, Essen, DE;
Juergen Droese, 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 by methods known per se of polyetherdiols with a stoichiometric excess of α,ω-dihydropolydimethylsiloxanes, in the presence of one or more compounds of elements of main group 13 and/or of transition group 3 as catalyst, which comprises, after completed reaction of the alcohol component, continuing the reaction until no remaining ≡Si(H) groups are detectable by a gas-volumetric method, and also to the compounds thus prepared, and to their use as surfactant additives for the production of polyurethane ether foams.